GNU bug report logs - #66098
Crash in itree.c on macOS with incomplete backtrace

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Package: emacs;

Reported by: Stefan Kangas <stefankangas <at> gmail.com>

Date: Tue, 19 Sep 2023 08:49:02 UTC

Severity: normal

To reply to this bug, email your comments to 66098 AT debbugs.gnu.org.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#66098; Package emacs. (Tue, 19 Sep 2023 08:49:02 GMT) Full text and rfc822 format available.
Acknowledgement sent to Stefan Kangas <stefankangas <at> gmail.com>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Tue, 19 Sep 2023 08:49:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Crash in itree.c on macOS with incomplete backtrace
Date: Tue, 19 Sep 2023 01:47:41 -0700

After rebuilding from master yesterday, I've started seeing frequent
crashes (several times a day) on macOS.  Thus, I re-built with all the
debug flags to investigate, and was able to get Emacs to crash almost
immediately after start, with the command `M-x notmuch'.

I'm not able to get much of a backtrace (see below).  Could it be that
the stack got corrupted somehow?  I've left the gdb session of the
crashed process open in case anyone has any ideas.  Is valgrind the best
tool for digging further, or are there any other tricks I can try?

Note the messages "Backtrace stopped: frame did not save the PC" and
"Cannot access memory at address 0x1e00000500000039".

(gdb) bt
#0  0x00000001003fb62c in itree_validate (tree=0x6000002720e0,
node=0x1e00000500000001) at itree.c:416
#1  0x00000001003fb6bd in itree_node_end (tree=0x6000002720e0,
node=0x1e00000500000001) at itree.c:462
#2  0x00000001001aded4 in terminate_due_to_signal (sig=298035829,
backtrace_limit=1) at emacs.c:447
#3  0x0000000111c3aa70 in ?? ()
#4  0x0000000111c3aa75 in ?? ()
#5  0x00007ff7bfef5210 in ?? ()
#6  0x00000001001a540d in OVERLAY_END (ov=XIL(0x111c3aa75)) at ./buffer.h:1428
Backtrace stopped: frame did not save the PC
[New Thread 0x1c37 of process 20794]

Lisp Backtrace:
"redisplay_internal (C function)" (0x0)
(gdb) bt full
#0  0x00000001003fb62c in itree_validate (tree=0x6000002720e0,
node=0x1e00000500000001) at itree.c:416
No locals.
#1  0x00000001003fb6bd in itree_node_end (tree=0x6000002720e0,
node=0x1e00000500000001) at itree.c:462
No locals.
#2  0x00000001001aded4 in terminate_due_to_signal (sig=298035829,
backtrace_limit=1) at emacs.c:447
No locals.
#3  0x0000000111c3aa70 in ?? ()
No symbol table info available.
#4  0x0000000111c3aa75 in ?? ()
No symbol table info available.
#5  0x00007ff7bfef5210 in ?? ()
No symbol table info available.
#6  0x00000001001a540d in OVERLAY_END (ov=XIL(0x111c3aa75)) at ./buffer.h:1428
No locals.
Backtrace stopped: frame did not save the PC

Lisp Backtrace:
"redisplay_internal (C function)" (0x0)
(gdb) xbacktrace
[New Thread 0x1c5b of process 20794]
[New Thread 0x1e27 of process 20794]
"redisplay_internal (C function)" (0x0)
(gdb) p tree->otick
$1 = 1
(gdb) p node->otick
Cannot access memory at address 0x1e00000500000039
(gdb) maintenance info sections
Exec file: `/Users/skangas/wip/emacs/src/emacs', file type mach-o-x86-64.
 [0]      0x100003280->0x1004ad680 at 0x00003280: .text ALLOC LOAD
CODE HAS_CONTENTS
 [1]      0x1004ad680->0x1004ae96a at 0x004ad680: __TEXT.__stubs ALLOC
LOAD READONLY CODE HAS_CONTENTS
 [2]      0x1004ae96c->0x1004b0902 at 0x004ae96c: __TEXT.__stub_helper
ALLOC LOAD READONLY CODE HAS_CONTENTS
 [3]      0x1004b0910->0x1004c6c5f at 0x004b0910: .const ALLOC LOAD
READONLY DATA HAS_CONTENTS
 [4]      0x1004c6c5f->0x10051d801 at 0x004c6c5f: .cstring ALLOC LOAD
READONLY DATA HAS_CONTENTS
 [5]      0x10051d804->0x10051d820 at 0x0051d804:
__TEXT.__gcc_except_tab ALLOC LOAD READONLY CODE HAS_CONTENTS
 [6]      0x10051d820->0x100521807 at 0x0051d820:
__TEXT.__objc_methname ALLOC LOAD READONLY CODE HAS_CONTENTS
 [7]      0x100521807->0x100521905 at 0x00521807:
__TEXT.__objc_classname ALLOC LOAD READONLY CODE HAS_CONTENTS
 [8]      0x100521905->0x100523e3f at 0x00521905:
__TEXT.__objc_methtype ALLOC LOAD READONLY CODE HAS_CONTENTS
 [9]      0x100523e40->0x100523ffc at 0x00523e40: __TEXT.__unwind_info
ALLOC LOAD READONLY CODE HAS_CONTENTS
 [10]     0x100524000->0x100524380 at 0x00524000: __DATA_CONST.__got
ALLOC LOAD DATA HAS_CONTENTS
 [11]     0x100524380->0x10052d4a8 at 0x00524380: __DATA_CONST.__const
ALLOC LOAD DATA HAS_CONTENTS
 [12]     0x10052d4a8->0x10052dee8 at 0x0052d4a8:
__DATA_CONST.__cfstring ALLOC LOAD DATA HAS_CONTENTS
 [13]     0x10052dee8->0x10052df50 at 0x0052dee8:
__DATA_CONST.__objc_classlist ALLOC LOAD DATA HAS_CONTENTS
 [14]     0x10052df50->0x10052df60 at 0x0052df50:
__DATA_CONST.__objc_catlist ALLOC LOAD DATA HAS_CONTENTS
 [15]     0x10052df60->0x10052df88 at 0x0052df60:
__DATA_CONST.__objc_protolist ALLOC LOAD DATA HAS_CONTENTS
 [16]     0x10052df88->0x10052df90 at 0x0052df88:
__DATA_CONST.__objc_imageinfo ALLOC LOAD DATA HAS_CONTENTS
 [17]     0x100530000->0x100531938 at 0x00530000:
__DATA.__la_symbol_ptr ALLOC LOAD DATA HAS_CONTENTS
 [18]     0x100531938->0x100535958 at 0x00531938: __DATA.__objc_const
ALLOC LOAD DATA HAS_CONTENTS
 [19]     0x100535958->0x100536ce0 at 0x00535958:
__DATA.__objc_selrefs ALLOC LOAD DATA HAS_CONTENTS
 [20]     0x100536ce0->0x100536f20 at 0x00536ce0:
__DATA.__objc_classrefs ALLOC LOAD DATA HAS_CONTENTS
 [21]     0x100536f20->0x100536f78 at 0x00536f20:
__DATA.__objc_superrefs ALLOC LOAD DATA HAS_CONTENTS
 [22]     0x100536f78->0x1005371b0 at 0x00536f78: __DATA.__objc_ivar
ALLOC LOAD DATA HAS_CONTENTS
 [23]     0x1005371b0->0x1005375c0 at 0x005371b0: __DATA.__objc_data
ALLOC LOAD DATA HAS_CONTENTS
 [24]     0x1005375c0->0x10054acd0 at 0x005375c0: __DATA.subrs ALLOC
LOAD DATA HAS_CONTENTS
 [25]     0x10054acd0->0x100aed21c at 0x0054acd0: .data ALLOC LOAD
DATA HAS_CONTENTS
 [26]     0x100aed220->0x100b32b74 at 0x00000000: .bss ALLOC
 [27]     0x100b32b80->0x100b9ba78 at 0x00000000: __DATA.__common ALLOC
(gdb)


In GNU Emacs 30.0.50 (build 3, x86_64-apple-darwin21.6.0, NS
 appkit-2113.60 Version 12.6.9 (Build 21G726)) of 2023-09-18 built on
 MY-MacBook-Pro
Repository revision: 861f9cb78370e2b78f852e5ccde9b63c94486ca8
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2113
System Description:  macOS 12.6.9

Configured using:
 'configure --enable-checking=yes,glyphs --enable-check-lisp-object-type
 'CFLAGS=-O0 -g3''

Configured features:
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Important settings:
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Load-path shadows:
/Users/skangas/.emacs.d/elpa/elsa-20230621.1005/Elsafile hides
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/Users/skangas/.emacs.d/elpa/transient-20230812.2142/transient hides
/Users/skangas/wip/emacs/lisp/transient
/Users/skangas/.emacs.d/elpa/ef-themes-1.3.0/theme-loaddefs hides
/Users/skangas/wip/emacs/lisp/theme-loaddefs

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Memory information:
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Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#66098; Package emacs. (Tue, 19 Sep 2023 09:24:01 GMT) Full text and rfc822 format available.

Message #8 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 66098 <at> debbugs.gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Tue, 19 Sep 2023 11:23:36 +0200

>>>>> On Tue, 19 Sep 2023 01:47:41 -0700, Stefan Kangas <stefankangas <at> gmail.com> said:

    Stefan> After rebuilding from master yesterday, I've started seeing frequent
    Stefan> crashes (several times a day) on macOS.  Thus, I re-built with all the
    Stefan> debug flags to investigate, and was able to get Emacs to crash almost
    Stefan> immediately after start, with the command `M-x notmuch'.

    Stefan> I'm not able to get much of a backtrace (see below).  Could it be that
    Stefan> the stack got corrupted somehow?  I've left the gdb session of the
    Stefan> crashed process open in case anyone has any ideas.  Is valgrind the best
    Stefan> tool for digging further, or are there any other tricks I can try?

Does valgrind run on macOS these days? Iʼd start by adding
'-fsanitize=address' to your CFLAGS.

(and I find lldb gives a better debugging experience than gdb on
macOS)

Robert
--
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#66098; Package emacs. (Tue, 19 Sep 2023 10:10:02 GMT) Full text and rfc822 format available.

Message #11 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 66098 <at> debbugs.gnu.org, Paul Eggert <eggert <at> cs.ucla.edu>
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Tue, 19 Sep 2023 12:09:24 +0200

>>>>> On Tue, 19 Sep 2023 11:23:36 +0200, Robert Pluim <rpluim <at> gmail.com> said:

>>>>> On Tue, 19 Sep 2023 01:47:41 -0700, Stefan Kangas <stefankangas <at> gmail.com> said:
    Stefan> After rebuilding from master yesterday, I've started seeing frequent
    Stefan> crashes (several times a day) on macOS.  Thus, I re-built with all the
    Stefan> debug flags to investigate, and was able to get Emacs to crash almost
    Stefan> immediately after start, with the command `M-x notmuch'.

    Stefan> I'm not able to get much of a backtrace (see below).  Could it be that
    Stefan> the stack got corrupted somehow?  I've left the gdb session of the
    Stefan> crashed process open in case anyone has any ideas.  Is valgrind the best
    Stefan> tool for digging further, or are there any other tricks I can try?

    Robert> Does valgrind run on macOS these days? Iʼd start by adding
    Robert> '-fsanitize=address' to your CFLAGS.

Which I just tried, and it gave me

==22145==ERROR: AddressSanitizer: stack-buffer-underflow on address 0x00016dcc4540 at pc 0x000105924ee0 bp 0x00016dcc4090 sp 0x00016dcc3850
READ of size 8 at 0x00016dcc4540 thread T0
    #0 0x105924edc in __asan_memcpy+0x1a4 (libclang_rt.asan_osx_dynamic.dylib:arm64e+0x40edc) (BuildId: f0a7ac5c49bc3abc851181b6f92b308a32000000200000000100000000000b00)
    #1 0x1022d388c in vadd_to_log xdisp.c:11821
    #2 0x1022d32b4 in add_to_log xdisp.c:11798

Which I fixed like this:

diff --git a/src/xdisp.c b/src/xdisp.c
index 2944f3964e8..f1980c4f20c 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -11808,7 +11808,7 @@ vadd_to_log (char const *format, va_list ap)
   eassert (nargs <= ARRAYELTS (args));
   AUTO_STRING (args0, format);
   args[0] = args0;
-  for (ptrdiff_t i = 1; i <= nargs; i++)
+  for (ptrdiff_t i = 1; i < nargs; i++)
     args[i] = va_arg (ap, Lisp_Object);
   Lisp_Object msg = Qnil;
   msg = Fformat_message (nargs, args);

Given that this code has been like this since 2015, please sanity
check the patch whilst I up my caffeine levels :-)

Robert
--
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#66098; Package emacs. (Tue, 19 Sep 2023 11:26:01 GMT) Full text and rfc822 format available.

Message #14 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 66098 <at> debbugs.gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Tue, 19 Sep 2023 14:24:58 +0300

> From: Stefan Kangas <stefankangas <at> gmail.com>
> Date: Tue, 19 Sep 2023 01:47:41 -0700
> 
> After rebuilding from master yesterday, I've started seeing frequent
> crashes (several times a day) on macOS.

When was your previous build done, and with what HEAD commit?

> Thus, I re-built with all the debug flags to investigate, and was
> able to get Emacs to crash almost immediately after start, with the
> command `M-x notmuch'.

I don't have this command in Emacs.  Any easier recipes?
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#66098; Package emacs. (Tue, 19 Sep 2023 11:43:02 GMT) Full text and rfc822 format available.

Message #17 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 66098 <at> debbugs.gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Tue, 19 Sep 2023 13:42:25 +0200

Stefan Kangas <stefankangas <at> gmail.com> writes:

> In GNU Emacs 30.0.50 (build 3, x86_64-apple-darwin21.6.0, NS
>  appkit-2113.60 Version 12.6.9 (Build 21G726)) of 2023-09-18 built on
>  MY-MacBook-Pro
> Repository revision: 861f9cb78370e2b78f852e5ccde9b63c94486ca8

git branch --contains 861f9cb78370e2b78f852e5ccde9b63c94486ca8

shows no branch?
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bug#66098; Package emacs. (Tue, 19 Sep 2023 12:22:02 GMT) Full text and rfc822 format available.

Message #20 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 66098 <at> debbugs.gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Tue, 19 Sep 2023 14:21:33 +0200

Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:

> Stefan Kangas <stefankangas <at> gmail.com> writes:
>
>> In GNU Emacs 30.0.50 (build 3, x86_64-apple-darwin21.6.0, NS
>>  appkit-2113.60 Version 12.6.9 (Build 21G726)) of 2023-09-18 built on
>>  MY-MacBook-Pro
>> Repository revision: 861f9cb78370e2b78f852e5ccde9b63c94486ca8
>
> git branch --contains 861f9cb78370e2b78f852e5ccde9b63c94486ca8
>
> shows no branch? 

Hm, now it's there.
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Message #23 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Robert Pluim <rpluim <at> gmail.com>
Cc: 66098 <at> debbugs.gnu.org, Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Wed, 20 Sep 2023 01:08:20 -0700

On 2023-09-19 03:09, Robert Pluim wrote:
> -  for (ptrdiff_t i = 1; i <= nargs; i++)
> +  for (ptrdiff_t i = 1; i < nargs; i++)

Thanks for reporting that fix. I installed it on Savannah master. I 
don't know whether this has anything to do with the original bug#66098, 
though.
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Message #26 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 66098 <at> debbugs.gnu.org, Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Wed, 20 Sep 2023 10:22:15 +0200

>>>>> On Wed, 20 Sep 2023 01:08:20 -0700, Paul Eggert <eggert <at> cs.ucla.edu> said:

    Paul> On 2023-09-19 03:09, Robert Pluim wrote:
    >> -  for (ptrdiff_t i = 1; i <= nargs; i++)
    >> +  for (ptrdiff_t i = 1; i < nargs; i++)

    Paul> Thanks for reporting that fix. I installed it on Savannah master. I
    Paul> don't know whether this has anything to do with the original
    Paul> bug#66098, though.

I doubt it. I do wonder why asan on macOS found it, but asan on
GNU/Linux didnʼt (I tried with GCC-12)

Robert
--
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Message #29 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 66098 <at> debbugs.gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Fri, 22 Sep 2023 03:51:33 -0700

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Stefan Kangas <stefankangas <at> gmail.com>
>> Date: Tue, 19 Sep 2023 01:47:41 -0700
>>
>> After rebuilding from master yesterday, I've started seeing frequent
>> crashes (several times a day) on macOS.
>
> When was your previous build done, and with what HEAD commit?

I think I lost that information when I rebuilt, unless we save it
automatically somewhere.  But it would have been something from the 1-2
weeks before they day when I reported this.

> I don't have this command in Emacs.  Any easier recipes?

Not yet, sorry.  I'm trying to find one.
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Message #32 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Robert Pluim <rpluim <at> gmail.com>
Cc: 66098 <at> debbugs.gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Fri, 22 Sep 2023 03:58:13 -0700

Robert Pluim <rpluim <at> gmail.com> writes:

> Does valgrind run on macOS these days?

It seems like it doesn't, but there is a patched version that some users
have reported works for them:

    https://github.com/LouisBrunner/valgrind-macos

I didn't try it, as it feels iffy to install stuff from random GitHub
repositories, and I don't have a macOS VM to play with.

> Iʼd start by adding '-fsanitize=address' to your CFLAGS.

I tried that, and the crash disappeared.  Nothing has come up so far,
not even the bug that you found.

However, I had to install a new version of llvm to get asan support, and
it seems the new build is using my old clang but CPPFLAGS and LDFLAGS is
pointing to the new version.  Perhaps that has something to do with it,
so I'll try rebuilding without that next.

This is the new build:

Configured using:
 'configure 'CFLAGS=-O0 -g3 -fsanitize=address'
 CPPFLAGS=-I/usr/local/opt/llvm/include
 LDFLAGS=-L/usr/local/opt/llvm/lib'

The old one had:

Configured using:
 'configure --enable-checking=yes,glyphs --enable-check-lisp-object-type
 'CFLAGS=-O0 -g3''
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Message #35 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 66098 <at> debbugs.gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Fri, 22 Sep 2023 14:07:02 +0200

>>>>> On Fri, 22 Sep 2023 03:58:13 -0700, Stefan Kangas <stefankangas <at> gmail.com> said:

    >> Iʼd start by adding '-fsanitize=address' to your CFLAGS.

    Stefan> I tried that, and the crash disappeared.  Nothing has come up so far,
    Stefan> not even the bug that you found.

Paul installed a fix on master.

    Stefan> However, I had to install a new version of llvm to get asan support, and
    Stefan> it seems the new build is using my old clang but CPPFLAGS and LDFLAGS is
    Stefan> pointing to the new version.  Perhaps that has something to do with it,
    Stefan> so I'll try rebuilding without that next.

If you installed using homebrew, then the new clang wonʼt be in $PATH,
since clang is a system binary, so you need to either adjust your
$PATH or pass CC=/path/to/clang to configure.

Robert
--
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Message #38 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 66098 <at> debbugs.gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Fri, 22 Sep 2023 15:36:22 +0300

> From: Stefan Kangas <stefankangas <at> gmail.com>
> Date: Fri, 22 Sep 2023 03:51:33 -0700
> Cc: 66098 <at> debbugs.gnu.org
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> From: Stefan Kangas <stefankangas <at> gmail.com>
> >> Date: Tue, 19 Sep 2023 01:47:41 -0700
> >>
> >> After rebuilding from master yesterday, I've started seeing frequent
> >> crashes (several times a day) on macOS.
> >
> > When was your previous build done, and with what HEAD commit?
> 
> I think I lost that information when I rebuilt, unless we save it
> automatically somewhere.

Does "git reflog" help?
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Message #41 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 66098 <at> debbugs.gnu.org, Stefan Kangas <stefankangas <at> gmail.com>
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Fri, 22 Sep 2023 14:46:31 +0200

>>>>> On Fri, 22 Sep 2023 15:36:22 +0300, Eli Zaretskii <eliz <at> gnu.org> said:

    >> From: Stefan Kangas <stefankangas <at> gmail.com>
    >> Date: Fri, 22 Sep 2023 03:51:33 -0700
    >> Cc: 66098 <at> debbugs.gnu.org
    >> 
    >> Eli Zaretskii <eliz <at> gnu.org> writes:
    >> 
    >> >> From: Stefan Kangas <stefankangas <at> gmail.com>
    >> >> Date: Tue, 19 Sep 2023 01:47:41 -0700
    >> >>
    >> >> After rebuilding from master yesterday, I've started seeing frequent
    >> >> crashes (several times a day) on macOS.
    >> >
    >> > When was your previous build done, and with what HEAD commit?
    >> 
    >> I think I lost that information when I rebuilt, unless we save it
    >> automatically somewhere.

    Eli> Does "git reflog" help?

This is why we have the numbered emacs builds in 'src/', no? Of
course that wonʼt help if you clean before building.

Robert
--
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Message #44 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Robert Pluim <rpluim <at> gmail.com>, Eli Zaretskii <eliz <at> gnu.org>
Cc: 66098 <at> debbugs.gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Sat, 23 Sep 2023 04:56:56 -0700

Robert Pluim <rpluim <at> gmail.com> writes:

>     Eli> Does "git reflog" help?
>
> This is why we have the numbered emacs builds in 'src/', no? Of
> course that wonʼt help if you clean before building.

My workflow is that I pull and rebuild many times a day, in the same
repository as I run the Emacs I use daily from.  When I start or restart
Emacs, that version is just whatever happens to have been built last.

So I unfortunately don't think git reflog or numbered builds will help
with finding this information in my case.
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Message #47 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 66098 <at> debbugs.gnu.org, rpluim <at> gmail.com
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Sat, 23 Sep 2023 15:42:38 +0300

> From: Stefan Kangas <stefankangas <at> gmail.com>
> Date: Sat, 23 Sep 2023 04:56:56 -0700
> Cc: 66098 <at> debbugs.gnu.org
> 
> Robert Pluim <rpluim <at> gmail.com> writes:
> 
> >     Eli> Does "git reflog" help?
> >
> > This is why we have the numbered emacs builds in 'src/', no? Of
> > course that wonʼt help if you clean before building.
> 
> My workflow is that I pull and rebuild many times a day, in the same
> repository as I run the Emacs I use daily from.  When I start or restart
> Emacs, that version is just whatever happens to have been built last.
> 
> So I unfortunately don't think git reflog or numbered builds will help
> with finding this information in my case.

The numbered builds will help if you don't bootstrap each time (which
removes all the previous binaries).  If you still have the numbered
builds from past rebuild procedures, you can "bisect" the problem by
finding the latest numbered build which doesn't crash, then look at
its recorded Git SHA of the commit it was produced from.  Knowing that
commit will help identify the potential culprit much easier.
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Message #50 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Robert Pluim <rpluim <at> gmail.com>
Cc: 66098 <at> debbugs.gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Sat, 23 Sep 2023 06:02:05 -0700

Robert Pluim <rpluim <at> gmail.com> writes:

>>>>>> On Fri, 22 Sep 2023 03:58:13 -0700, Stefan Kangas <stefankangas <at> gmail.com> said:
>
>     >> Iʼd start by adding '-fsanitize=address' to your CFLAGS.
>
>     Stefan> I tried that, and the crash disappeared.  Nothing has come up so far,
>     Stefan> not even the bug that you found.
>
> Paul installed a fix on master.

I've been running the same commit as before, before that fix.  Sorry for
not being more clear.

I was thinking that maybe asan is disabled or something, but I can see
the asan threads in gdb, and I get asan messages when building.  So I'm
not sure how you could find the issue and I don't.
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Message #53 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 66098 <at> debbugs.gnu.org, rpluim <at> gmail.com, Andrea Corallo <acorallo <at> gnu.org>
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Sun, 24 Sep 2023 03:55:17 -0700

Eli Zaretskii <eliz <at> gnu.org> writes:

> The numbered builds will help if you don't bootstrap each time (which
> removes all the previous binaries).  If you still have the numbered
> builds from past rebuild procedures, you can "bisect" the problem by
> finding the latest numbered build which doesn't crash, then look at
> its recorded Git SHA of the commit it was produced from.  Knowing that
> commit will help identify the potential culprit much easier.

When I rebuilt --with-native-compilation on current master, I was able
to reproduce the crash again.  The best recipe I have found so far, is
to basically run `M-x notmuch' and then reply to some emails.  The most
recent crash happened while I was merely typing in a message-mode
buffer, nothing more than that.

Building with native compilation is a recent change on my macOS machine,
which I haven't used very actively up until recently.  I therefore
suspect that this crash has something to do with that, rather than some
recent change on master.  Sorry for not realizing this earlier.

Find below the Apple crash log, which says something about trampoline
and native_elisp_load.  Unfortunately, the below crash happened in an
optimized build.

I'm currently running with asan and native compilation to see if I can
get more details that way.  I'll also see if I can catch this in GDB or
LLDB.

I'm not sure if it matters, but I'm building Emacs with clang 14.0.0.

-------------------------------------
Translated Report (Full Report Below)
-------------------------------------

Process:               emacs-30.0.50.1 [32619]
Path:                  /Users/USER/*/emacs
Identifier:            emacs-30.0.50.1
Version:               ???
Code Type:             X86-64 (Native)
Parent Process:        bash [25201]
Responsible:           iTerm2 [1444]
User ID:               501

Date/Time:             2023-09-24 11:53:45.0592 +0200
OS Version:            macOS 12.6.9 (21G726)
Report Version:        12

Time Awake Since Boot: 400000 seconds
Time Since Wake:       15993 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGABRT)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000001ec8
Exception Codes:       0x0000000000000001, 0x0000000000001ec8
Exception Note:        EXC_CORPSE_NOTIFY

VM Region Info: 0x1ec8 is not in any region.  Bytes before following
region: 4344987960
      REGION TYPE                    START - END         [ VSIZE]
PRT/MAX SHRMOD  REGION DETAIL
      UNUSED SPACE AT START
--->
      __TEXT                      102fb6000-103282000    [ 2864K]
r-x/r-x SM=COW  .../USER/*/emacs

Thread 0 Crashed::  Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib        	    0x7ff80c252ffe __pthread_kill + 10
1   libsystem_pthread.dylib       	    0x7ff80c2891ff pthread_kill + 263
2   libsystem_c.dylib             	    0x7ff80c1972d8 raise + 26
3   emacs                         	       0x10323ae09
terminate_due_to_signal + 169
4   emacs                         	       0x10323b79b emacs_abort + 15
5   emacs                         	       0x1031f94d2 ns_term_shutdown + 162
6   emacs                         	       0x1030a03c8 shut_down_emacs + 376
7   emacs                         	       0x10323add7
terminate_due_to_signal + 119
8   emacs                         	       0x1030c966e handle_fatal_signal + 14
9   emacs                         	       0x1030c96f1
deliver_thread_signal + 129
10  emacs                         	       0x1030c7999
deliver_fatal_thread_signal + 9
11  emacs                         	       0x1030c9739 handle_sigsegv + 57
12  libsystem_platform.dylib      	    0x7ff80c29edfd _sigtramp + 29
13  ???                           	               0x0 ???
14  emacs                         	       0x10319a8ca Fnative_elisp_load + 362
15  emacs                         	       0x10313eb4a Ffuncall + 458
16  comp-7672a6ed-231f6e5c.eln    	       0x10e8c702a
F636f6d702d7472616d706f6c696e652d736561726368_comp_trampoline_search_0
+ 442
17  ???                           	    0x7fb2d9463cb3 ???
18  ???                           	    0x7fb2d9463cb3 ???
19  ???                           	    0x7fb2d9463cb3 ???
20  ???                           	    0x7fb2d9463cb3 ???
21  ???                           	    0x7fb2d9463cb3 ???
22  ???                           	    0x7fb2d9463cb3 ???
23  ???                           	    0x7fb2d9463cb3 ???
24  ???                           	    0x7fb2d9463cb3 ???
25  ???                           	    0x7fb2d9463cb3 ???
26  ???                           	    0x7fb2d9463cb3 ???
27  ???                           	    0x7fb2d9463cb3 ???
28  ???                           	    0x7fb2d9463cb3 ???
29  ???                           	    0x7fb2d9463cb3 ???
30  ???                           	    0x7fb2d9463cb3 ???
31  ???                           	    0x7fb2d9463cb3 ???
32  ???                           	    0x7fb2d9463cb3 ???
33  ???                           	    0x7fb2d9463cb3 ???
34  ???                           	    0x7fb2d9463cb3 ???
35  ???                           	    0x7fb2d9463cb3 ???
36  ???                           	    0x7fb2d9463cb3 ???
37  ???                           	    0x7fb2d9463cb3 ???
38  ???                           	    0x7fb2d9463cb3 ???
39  ???                           	    0x7fb2d9463cb3 ???
40  ???                           	    0x7fb2d9463cb3 ???
41  ???                           	    0x7fb2d9463cb3 ???
42  ???                           	    0x7fb2d9463cb3 ???
43  ???                           	    0x7fb2d9463cb3 ???
44  ???                           	    0x7fb2d9463cb3 ???
45  ???                           	    0x7fb2d9463cb3 ???
46  ???                           	    0x7fb2d9463cb3 ???
47  ???                           	    0x7fb2d9463cb3 ???
48  ???                           	    0x7fb2d9463cb3 ???
49  ???                           	    0x7fb2d9463cb3 ???
50  ???                           	    0x7fb2d9463cb3 ???
51  ???                           	    0x7fb2d9463cb3 ???
52  ???                           	    0x7fb2d9463cb3 ???
53  ???                           	    0x7fb2d9463cb3 ???
54  ???                           	    0x7fb2d9463cb3 ???
55  ???                           	    0x7fb2d9463cb3 ???
56  ???                           	    0x7fb2d9463cb3 ???
57  ???                           	    0x7fb2d9463cb3 ???
58  ???                           	    0x7fb2d9463cb3 ???
59  ???                           	    0x7fb2d9463cb3 ???
60  ???                           	    0x7fb2d9463cb3 ???
61  ???                           	    0x7fb2d9463cb3 ???
62  ???                           	    0x7fb2d9463cb3 ???
63  ???                           	    0x7fb2d9463cb3 ???
64  ???                           	    0x7fb2d9463cb3 ???
65  ???                           	    0x7fb2d9463cb3 ???
66  ???                           	    0x7fb2d9463cb3 ???
67  ???                           	    0x7fb2d9463cb3 ???
68  ???                           	    0x7fb2d9463cb3 ???
69  ???                           	    0x7fb2d9463cb3 ???
70  ???                           	    0x7fb2d9463cb3 ???
71  ???                           	    0x7fb2d9463cb3 ???
72  ???                           	    0x7fb2d9463cb3 ???
73  ???                           	    0x7fb2d9463cb3 ???
74  ???                           	    0x7fb2d9463cb3 ???
75  ???                           	    0x7fb2d9463cb3 ???
76  ???                           	    0x7fb2d9463cb3 ???
77  ???                           	    0x7fb2d9463cb3 ???
78  ???                           	    0x7fb2d9463cb3 ???
79  ???                           	    0x7fb2d9463cb3 ???
80  ???                           	    0x7fb2d9463cb3 ???
81  ???                           	    0x7fb2d9463cb3 ???
82  ???                           	    0x7fb2d9463cb3 ???
83  ???                           	    0x7fb2d9463cb3 ???
84  ???                           	    0x7fb2d9463cb3 ???
85  ???                           	    0x7fb2d9463cb3 ???
86  ???                           	    0x7fb2d9463cb3 ???
87  ???                           	    0x7fb2d9463cb3 ???
88  ???                           	    0x7fb2d9463cb3 ???
89  ???                           	    0x7fb2d9463cb3 ???
90  ???                           	    0x7fb2d9463cb3 ???
91  ???                           	    0x7fb2d9463cb3 ???
92  ???                           	    0x7fb2d9463cb3 ???
93  ???                           	    0x7fb2d9463cb3 ???
94  ???                           	    0x7fb2d9463cb3 ???
95  ???                           	    0x7fb2d9463cb3 ???
96  ???                           	    0x7fb2d9463cb3 ???
97  ???                           	    0x7fb2d9463cb3 ???
98  ???                           	    0x7fb2d9463cb3 ???
99  ???                           	    0x7fb2d9463cb3 ???
100 ???                           	    0x7fb2d9463cb3 ???
101 ???                           	    0x7fb2d9463cb3 ???
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120 ???                           	    0x7fb2d9463cb3 ???
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122 ???                           	    0x7fb2d9463cb3 ???
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124 ???                           	    0x7fb2d9463cb3 ???
125 ???                           	    0x7fb2d9463cb3 ???
126 ???                           	    0x7fb2d9463cb3 ???
127 ???                           	    0x7fb2d9463cb3 ???
128 ???                           	    0x7fb2d9463cb3 ???
129 ???                           	    0x7fb2d9463cb3 ???
130 ???                           	    0x7fb2d9463cb3 ???
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133 ???                           	    0x7fb2d9463cb3 ???
134 ???                           	    0x7fb2d9463cb3 ???
135 ???                           	    0x7fb2d9463cb3 ???
136 ???                           	    0x7fb2d9463cb3 ???
137 ???                           	    0x7fb2d9463cb3 ???
138 ???                           	    0x7fb2d9463cb3 ???
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140 ???                           	    0x7fb2d9463cb3 ???
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142 ???                           	    0x7fb2d9463cb3 ???
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144 ???                           	    0x7fb2d9463cb3 ???
145 ???                           	    0x7fb2d9463cb3 ???
146 ???                           	    0x7fb2d9463cb3 ???
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148 ???                           	    0x7fb2d9463cb3 ???
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150 ???                           	    0x7fb2d9463cb3 ???
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152 ???                           	    0x7fb2d9463cb3 ???
153 ???                           	    0x7fb2d9463cb3 ???
154 ???                           	    0x7fb2d9463cb3 ???
155 ???                           	    0x7fb2d9463cb3 ???
156 ???                           	    0x7fb2d9463cb3 ???
157 ???                           	    0x7fb2d9463cb3 ???
158 ???                           	    0x7fb2d9463cb3 ???
159 ???                           	    0x7fb2d9463cb3 ???
160 ???                           	    0x7fb2d9463cb3 ???
161 ???                           	    0x7fb2d9463cb3 ???
162 ???                           	    0x7fb2d9463cb3 ???
163 ???                           	    0x7fb2d9463cb3 ???
164 ???                           	    0x7fb2d9463cb3 ???
165 ???                           	    0x7fb2d9463cb3 ???
166 ???                           	    0x7fb2d9463cb3 ???
167 ???                           	    0x7fb2d9463cb3 ???
168 ???                           	    0x7fb2d9463cb3 ???
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170 ???                           	    0x7fb2d9463cb3 ???
171 ???                           	    0x7fb2d9463cb3 ???
172 ???                           	    0x7fb2d9463cb3 ???
173 ???                           	    0x7fb2d9463cb3 ???
174 ???                           	    0x7fb2d9463cb3 ???
175 ???                           	    0x7fb2d9463cb3 ???
176 ???                           	    0x7fb2d9463cb3 ???
177 ???                           	    0x7fb2d9463cb3 ???
178 ???                           	    0x7fb2d9463cb3 ???
179 ???                           	    0x7fb2d9463cb3 ???
180 ???                           	    0x7fb2d9463cb3 ???
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182 ???                           	    0x7fb2d9463cb3 ???
183 ???                           	    0x7fb2d9463cb3 ???
184 ???                           	    0x7fb2d9463cb3 ???
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186 ???                           	    0x7fb2d9463cb3 ???
187 ???                           	    0x7fb2d9463cb3 ???
188 ???                           	    0x7fb2d9463cb3 ???
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200 ???                           	    0x7fb2d9463cb3 ???
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232 ???                           	    0x7fb2d9463cb3 ???
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488 ???                           	    0x7fb2d9463cb3 ???
489 ???                           	    0x7fb2d9463cb3 ???
490 ???                           	    0x7fb2d9463cb3 ???
491 ???                           	    0x7fb2d9463cb3 ???
492 ???                           	    0x7fb2d9463cb3 ???
493 ???                           	    0x7fb2d9463cb3 ???
494 ???                           	    0x7fb2d9463cb3 ???
495 ???                           	    0x7fb2d9463cb3 ???
496 ???                           	    0x7fb2d9463cb3 ???
497 ???                           	    0x7fb2d9463cb3 ???
498 ???                           	    0x7fb2d9463cb3 ???
499 ???                           	    0x7fb2d9463cb3 ???
500 ???                           	    0x7fb2d9463cb3 ???
501 ???                           	    0x7fb2d9463cb3 ???
502 ???                           	    0x7fb2d9463cb3 ???
503 ???                           	    0x7fb2d9463cb3 ???
504 ???                           	    0x7fb2d9463cb3 ???
505 ???                           	    0x7fb2d9463cb3 ???
506 ???                           	    0x7fb2d9463cb3 ???
507 ???                           	    0x7fb2d9463cb3 ???
508 ???                           	    0x7fb2d9463cb3 ???
509 ???                           	    0x7fb2d9463cb3 ???
510 ???                           	    0x7fb2d9463cb3 ???
511 ???                           	    0x7fb2d9463cb3 ???

Thread 1:
0   libsystem_kernel.dylib        	    0x7ff80c251456 __pselect + 10
1   libsystem_kernel.dylib        	    0x7ff80c251373 pselect$DARWIN_EXTSN + 42
2   emacs                         	       0x1031fa837 -[EmacsApp
fd_handler:] + 263
3   Foundation                    	    0x7ff80d1a5984 __NSThread__start__ + 1009
4   libsystem_pthread.dylib       	    0x7ff80c2894e1 _pthread_start + 125
5   libsystem_pthread.dylib       	    0x7ff80c284f6b thread_start + 15

Thread 2:: com.apple.NSEventThread
0   libsystem_kernel.dylib        	    0x7ff80c24c96a mach_msg_trap + 10
1   libsystem_kernel.dylib        	    0x7ff80c24ccd8 mach_msg + 56
2   CoreFoundation                	    0x7ff80c35034d
__CFRunLoopServiceMachPort + 319
3   CoreFoundation                	    0x7ff80c34e9d8 __CFRunLoopRun + 1276
4   CoreFoundation                	    0x7ff80c34de1c CFRunLoopRunSpecific + 562
5   AppKit                        	    0x7ff80eef698e _NSEventThread + 132
6   libsystem_pthread.dylib       	    0x7ff80c2894e1 _pthread_start + 125
7   libsystem_pthread.dylib       	    0x7ff80c284f6b thread_start + 15

Thread 3:
0   libsystem_pthread.dylib       	    0x7ff80c284f48 start_wqthread + 0


Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x00000001107d6600  rcx:
0x000000010378ce28  rdx: 0x0000000000000000
  rdi: 0x0000000000000103  rsi: 0x0000000000000006  rbp:
0x000000010378ce50  rsp: 0x000000010378ce28
   r8: 0x0000000000000b60   r9: 0x0000000000000020  r10:
0x00000001107d6600  r11: 0x0000000000000246
  r12: 0x0000000000000103  r13: 0x000000000000000b  r14:
0x0000000000000006  r15: 0x0000000000000016
  rip: 0x00007ff80c252ffe  rfl: 0x0000000000000246  cr2: 0x0000000113bc7002

Logical CPU:     0
Error Code:      0x02000148
Trap Number:     133

Thread 0 instruction stream:
  89 04 24 48 89 4c 24 08-48 89 6c 24 10 48 89 54  ..$H.L$.H.l$.H.T
  24 18 48 89 e6 bf 04 00-00 00 ff 93 48 1c 00 00  $.H.........H...
  48 83 c4 28 5b 5d c3 48-83 ec 10 48 89 fa 48 8d  H..([].H...H..H.
  05 a6 02 00 00 4c 8b 48-20 48 8d 0d 5b 02 00 00  .....L.H H..[...
  4c 8b 41 10 48 8b 48 08-48 8b 70 18 48 8b 78 10  L.A.H.H.H.p.H.x.
  48 8d 05 bc 02 00 00 48-8b 00 52 ba 06 00 00 00  H......H..R.....
 [ff]90 c8 1e 00 00 48 83-c4 18 c3 14 00 00 00 00  ......H.........	<==
  00 00 00 01 7a 52 00 01-78 10 01 10 0c 07 08 90  ....zR..x.......
  01 00 00 44 00 00 00 1c-00 00 00 42 ff ff ff ff  ...D.......B....
  ff ff ff 5a 00 00 00 00-00 00 00 00 04 01 00 00  ...Z............
  00 0e 10 86 02 04 01 00-00 00 0e 18 83 03 04 04  ................
  00 00 00 0e 40 04 51 00-00 00 0e 18 04 01 00 00  ....@.Q.........

Binary Images:
    0x7ff80c24b000 -     0x7ff80c282fff libsystem_kernel.dylib (*)
<5e9789af-5bca-3e41-a07a-c2dcc3180ea3>
/usr/lib/system/libsystem_kernel.dylib
    0x7ff80c283000 -     0x7ff80c28efff libsystem_pthread.dylib (*)
<e5d44afd-2577-3cee-8711-9d8d426229e0>
/usr/lib/system/libsystem_pthread.dylib
    0x7ff80c153000 -     0x7ff80c1dbfff libsystem_c.dylib (*)
<e42e9d7a-03b4-340b-b61e-dcd45fd4acc0>
/usr/lib/system/libsystem_c.dylib
       0x102fb6000 -        0x103281fff emacs (*)
<17fdbe3f-044a-3c04-a6f9-3a3f39753065> /Users/USER/*/emacs
    0x7ff80c29b000 -     0x7ff80c2a4fff libsystem_platform.dylib (*)
<a8a33774-6d44-35e9-ad2a-bad9e4d5192a>
/usr/lib/system/libsystem_platform.dylib
               0x0 - 0xffffffffffffffff ??? (*)
<00000000-0000-0000-0000-000000000000> ???
       0x10e865000 -        0x10e8e8fff comp-7672a6ed-231f6e5c.eln (*)
<4e960752-6eaf-36c4-85b0-9840e87c866c>
/Users/USER/*/comp-7672a6ed-231f6e5c.eln
    0x7ff80d14d000 -     0x7ff80d509fff com.apple.Foundation (6.9)
<e62db949-fe2d-3637-a40a-c1411a467e05>
/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
    0x7ff80c2d0000 -     0x7ff80c7d2fff com.apple.CoreFoundation (6.9)
<9b3c3dc0-9b20-3e96-ad7b-322bb8f34a05>
/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
    0x7ff80ed4a000 -     0x7ff80fbd9fff com.apple.AppKit (6.9)
<129c4dce-5711-37dd-839d-434ccbdb9cea>
/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit

External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 5
    thread_create: 0
    thread_set_state: 960

VM Region Summary:
ReadOnly portion of Libraries: Total=1.0G resident=0K(0%)
swapped_out_or_unallocated=1.0G(100%)
Writable regions: Total=713.4M written=0K(0%) resident=0K(0%)
swapped_out=0K(0%) unallocated=713.4M(100%)

                                VIRTUAL   REGION
REGION TYPE                        SIZE    COUNT (non-coalesced)
===========                     =======  =======
Accelerate framework               384K        3
Activity Tracing                   256K        1
CG backing stores                 2160K        4
CG image                           364K       10
ColorSync                          212K       24
CoreAnimation                      364K        7
CoreGraphics                         4K        1
CoreUI image data                 1016K        7
Foundation                          16K        1
Image IO                            80K        5
Kernel Alloc Once                    8K        1
MALLOC                           437.1M      187
MALLOC guard page                   32K        7
MALLOC_NANO (reserved)           256.0M        1         reserved VM
address space (unallocated)
ObjC additional data                15K        1
STACK GUARD                         12K        3
Stack                             9752K        4
Stack (reserved)                  1596K        1         reserved VM
address space (unallocated)
Stack Guard                       54.4M        1
VM_ALLOCATE                        304K       11
__CTF                               756        1
__DATA                            51.7M      988
__DATA_CONST                      22.9M      542
__DATA_DIRTY                       768K      118
__FONT_DATA                          4K        1
__LINKEDIT                       668.8M      529
__TEXT                           333.2M      893
__UNICODE                          592K        1
dyld private memory               1024K        1
mapped file                      924.5M       73
shared memory                      784K       18
===========                     =======  =======
TOTAL                              2.7G     3445
TOTAL, minus reserved VM space     2.5G     3445



-----------
Full Report
-----------

{"app_name":"emacs-30.0.50.1","timestamp":"2023-09-24 11:53:53.00
+0200","app_version":"","slice_uuid":"17fdbe3f-044a-3c04-a6f9-3a3f39753065","build_version":"","platform":1,"share_with_app_devs":0,"is_first_party":1,"bug_type":"309","os_version":"macOS
12.6.9 (21G726)","incident_id":"71A2F779-A9F4-4E61-A174-F757FD62CDDC","name":"emacs-30.0.50.1"}
{
  "uptime" : 400000,
  "procLaunch" : "2023-09-24 10:31:09.8646 +0200",
  "procRole" : "Foreground",
  "version" : 2,
  "userID" : 501,
  "deployVersion" : 210,
  "modelCode" : "MacBookPro12,1",
  "procStartAbsTime" : 403466821796850,
  "coalitionID" : 744,
  "osVersion" : {
    "train" : "macOS 12.6.9",
    "build" : "21G726",
    "releaseType" : "User"
  },
  "captureTime" : "2023-09-24 11:53:45.0592 +0200",
  "bug_type" : "309",
  "pid" : 32619,
  "procExitAbsTime" : 408421973829781,
  "cpuType" : "X86-64",
  "procName" : "emacs-30.0.50.1",
  "procPath" : "\/Users\/USER\/*\/emacs",
  "parentProc" : "bash",
  "parentPid" : 25201,
  "coalitionName" : "com.googlecode.iterm2",
  "responsiblePid" : 1444,
  "responsibleProc" : "iTerm2",
  "wakeTime" : 15993,
  "sip" : "enabled",
  "vmRegionInfo" : "0x1ec8 is not in any region.  Bytes before
following region: 4344987960\n      REGION TYPE
START - END         [ VSIZE] PRT\/MAX SHRMOD  REGION DETAIL\n
UNUSED SPACE AT START\n--->  \n      __TEXT
102fb6000-103282000    [ 2864K] r-x\/r-x SM=COW  ...\/USER\/*\/emacs",
  "isCorpse" : 1,
  "exception" : {"codes":"0x0000000000000001,
0x0000000000001ec8","rawCodes":[1,7880],"type":"EXC_BAD_ACCESS","signal":"SIGABRT","subtype":"KERN_INVALID_ADDRESS
at 0x0000000000001ec8"},
  "vmregioninfo" : "0x1ec8 is not in any region.  Bytes before
following region: 4344987960\n      REGION TYPE
START - END         [ VSIZE] PRT\/MAX SHRMOD  REGION DETAIL\n
UNUSED SPACE AT START\n--->  \n      __TEXT
102fb6000-103282000    [ 2864K] r-x\/r-x SM=COW  ...\/USER\/*\/emacs",
  "extMods" : {"caller":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"system":{"thread_create":0,"thread_set_state":960,"task_for_pid":5},"targeted":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"warnings":0},
  "faultingThread" : 0,
  "threads" : 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0x4B3445364533303445452D45474346000000
AirPort: spairport_wireless_card_type_wifi (0x14E4, 0x133), Broadcom
BCM43xx 1.0 (7.77.111.1 AirPortDriverBrcmNIC-1710.4)
AirPort:
Bluetooth: Version (null), 0 services, 0 devices, 0 incoming serial ports
Network Service: Wi-Fi, AirPort, en0
Serial ATA Device: APPLE SSD SM0256G, 251 GB
USB Device: USB30Bus
USB Device: Bluetooth USB Host Controller
Thunderbolt Bus: MacBook Pro, Apple Inc., 27.1
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#66098; Package emacs. (Sun, 24 Sep 2023 12:12:02 GMT) Full text and rfc822 format available.

Message #56 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 66098 <at> debbugs.gnu.org, rpluim <at> gmail.com, acorallo <at> gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Sun, 24 Sep 2023 15:10:38 +0300

> From: Stefan Kangas <stefankangas <at> gmail.com>
> Date: Sun, 24 Sep 2023 03:55:17 -0700
> Cc: rpluim <at> gmail.com, 66098 <at> debbugs.gnu.org, Andrea Corallo <acorallo <at> gnu.org>
> 
> Find below the Apple crash log, which says something about trampoline
> and native_elisp_load.  Unfortunately, the below crash happened in an
> optimized build.

Looks like infinite recursion of some sorts?  The function at
0x7fb2d9463cb3 calls itself again and again.

Are you saying that the problem doesn't happen without
native-compilation?
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#66098; Package emacs. (Sun, 24 Sep 2023 12:26:02 GMT) Full text and rfc822 format available.

Message #59 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 66098 <at> debbugs.gnu.org, rpluim <at> gmail.com, acorallo <at> gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Sun, 24 Sep 2023 05:25:38 -0700

Eli Zaretskii <eliz <at> gnu.org> writes:

> Looks like infinite recursion of some sorts?  The function at
> 0x7fb2d9463cb3 calls itself again and again.

Yes, it looks like it.

> Are you saying that the problem doesn't happen without
> native-compilation?

I thought that for a second, but that can't be right since I did see a
crash also without it, in the original bug report:

Configured using:
 'configure --enable-checking=yes,glyphs --enable-check-lisp-object-type
 'CFLAGS=-O0 -g3''

Assuming that was the same crash, of course.

I'm still trying various configurations to find out more, but it's slow
going since I can't seem to find a way to reproduce it consistently.
I'm now running this build:

Configured using:
 'configure 'CFLAGS=-O0 -g3 -fsanitize=address'
 --with-native-compilation CPPFLAGS=-I/usr/local/opt/llvm/include
 LDFLAGS=-L/usr/local/opt/llvm/lib'

Since I did not see this a few weeks ago, perhaps it's time to bite the
bullet and bisect.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#66098; Package emacs. (Sun, 24 Sep 2023 21:03:02 GMT) Full text and rfc822 format available.

Message #62 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 66098 <at> debbugs.gnu.org, rpluim <at> gmail.com, acorallo <at> gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Sun, 24 Sep 2023 14:01:44 -0700

[Message part 1 (text/plain, inline)]
Stefan Kangas <stefankangas <at> gmail.com> writes:

> I'm still trying various configurations to find out more, but it's slow
> going since I can't seem to find a way to reproduce it consistently.
> I'm now running this build:
>
> Configured using:
>  'configure 'CFLAGS=-O0 -g3 -fsanitize=address'
>  --with-native-compilation CPPFLAGS=-I/usr/local/opt/llvm/include
>  LDFLAGS=-L/usr/local/opt/llvm/lib'

I was now able to reproduce the crash again.  This time I was typing
C-M-x (`eval-defun') in an elisp-mode buffer when it crashed, for a form
which AFAICT basically sets some variables and nothing more.  Here is
the form, for the sake of completion:

    (use-package magit
      :bind (("C-c g" . magit-dispatch))
      :custom
      (magit-diff-refine-hunk 'all)
      (magit-repository-directories '(("~/wip/emacs/" . 0)))
      :config
      (with-eval-after-load 'magit-extras
        (setq magit-pop-revision-stack-format
              (pcase-let ((`(,pt ,_eob ,index-regexp)
                           (default-value 'magit-pop-revision-stack-format)))
                `(,pt "[%N: %h]: %ci\n  %s\n
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=%H"
                      ,index-regexp)))))

Unfortunately, ASan didn't catch anything useful.  The terminal output
is only this:

    Fatal error 11: Segmentation fault
    Abort trap: 6

The Apple crash log looks rather similar to the old one, but the line
numbers for some of the calls are a bit different.  I've attached it
here just in case anyone else is able to glean something useful from it.

[Message part 2 (text/plain, attachment)]
[crash.txt.gz (application/octet-stream, attachment)]
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#66098; Package emacs. (Mon, 25 Sep 2023 03:39:02 GMT) Full text and rfc822 format available.

Message #65 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Cc: 66098 <at> debbugs.gnu.org, rpluim <at> gmail.com, acorallo <at> gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Mon, 25 Sep 2023 05:38:19 +0200

On 23-09-24 23:01 , Stefan Kangas wrote:
> The Apple crash log looks rather similar to the old one, but the line
> numbers for some of the calls are a bit different.  I've attached it
> here just in case anyone else is able to glean something useful from it.

I'd run Emacs under lldb/gdb, the crash reports are not very helpful.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#66098; Package emacs. (Mon, 25 Sep 2023 03:39:02 GMT) Full text and rfc822 format available.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#66098; Package emacs. (Mon, 25 Sep 2023 08:38:02 GMT) Full text and rfc822 format available.

Message #71 received at 66098 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: 66098 <at> debbugs.gnu.org
Subject: Re: bug#66098: Crash in itree.c on macOS with incomplete backtrace
Date: Mon, 25 Sep 2023 10:36:53 +0200

>>>>> On Sat, 23 Sep 2023 06:02:05 -0700, Stefan Kangas <stefankangas <at> gmail.com> said:

    Stefan> Robert Pluim <rpluim <at> gmail.com> writes:
    >>>>>>> On Fri, 22 Sep 2023 03:58:13 -0700, Stefan Kangas <stefankangas <at> gmail.com> said:
    >> 
    >> >> Iʼd start by adding '-fsanitize=address' to your CFLAGS.
    >> 
    Stefan> I tried that, and the crash disappeared.  Nothing has come up so far,
    Stefan> not even the bug that you found.
    >> 
    >> Paul installed a fix on master.

    Stefan> I've been running the same commit as before, before that fix.  Sorry for
    Stefan> not being more clear.

    Stefan> I was thinking that maybe asan is disabled or something, but I can see
    Stefan> the asan threads in gdb, and I get asan messages when building.  So I'm
    Stefan> not sure how you could find the issue and I don't.

I could find it with clang on macOS (Arm), but not with gcc or clang
on Gnu/Linux (Intel), so maybe asan is just better on Arm :-)

Robert
--
This bug report was last modified 1 year and 264 days ago.

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