GNU bug report logs - #20748
25.0.50; Seemingly random segfaults.

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

From: zack <at> apertron.net
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50; Seemingly random segfaults.
Date: Fri, 05 Jun 2015 19:51:43 +0000

Starting program: /home/zack/ins/bin/emacs 
Got object file from memory but can't read symbols: File truncated.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fffe91f7700 (LWP 2058)]
Detaching after fork from child process 2158.
Detaching after fork from child process 2166.
Detaching after fork from child process 2167.
Detaching after fork from child process 2174.
Detaching after fork from child process 2176.
Detaching after fork from child process 2177.
Detaching after fork from child process 2178.
Detaching after fork from child process 2179.
Detaching after fork from child process 2180.
Detaching after fork from child process 2181.
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Detaching after fork from child process 2334.
Detaching after fork from child process 2335.
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Detaching after fork from child process 2339.
Detaching after fork from child process 2340.
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Program received signal SIGSEGV, Segmentation fault.
turn_on_face (f=f <at> entry=0xcde8f8, face_id=face_id <at> entry=74) at term.c:1902
1902	  unsigned long fg = face->foreground;
#0  0x00000000004dc28a in turn_on_face (f=f <at> entry=0xcde8f8, face_id=face_id <at> entry=74) at term.c:1902
        face = 0x0
        fg = <optimized out>
        bg = <optimized out>
        tty = <optimized out>
#1  0x00000000004dfdcc in tty_write_glyphs (f=<optimized out>, string=0x7fffe89c2430, len=<optimized out>) at term.c:775
        face_id = 74
        conversion_buffer = <optimized out>
        coding = <optimized out>
        n = <optimized out>
        stringlen = 274
        tty = 0x14b2ce0
#2  0x000000000041fcfb in update_frame_line (f=f <at> entry=0xcde8f8, vpos=vpos <at> entry=23) at dispnew.c:4832
        obody = <optimized out>
        nbody = 0x7fffe89c2340
        op1 = <optimized out>
        op2 = <optimized out>
        np1 = <optimized out>
        nend = <optimized out>
        tem = <optimized out>
        osp = <optimized out>
        nsp = <optimized out>
        begmatch = <optimized out>
        endmatch = <optimized out>
        olen = 0
        nlen = 279
        current_row = 0xf41490
        desired_row = <optimized out>
        must_write_whole_line_p = true
        write_spaces_p = <optimized out>
        colored_spaces_p = <optimized out>
#3  0x000000000042411e in update_frame_1 (f=f <at> entry=0xcde8f8, force_p=force_p <at> entry=true, inhibit_id_p=<optimized out>, 
    inhibit_id_p <at> entry=false, set_cursor_p=set_cursor_p <at> entry=true) at dispnew.c:4534
        current_matrix = 0x14b89e0
        desired_matrix = 0x14b8970
        i = 23
        pause_p = <optimized out>
        preempt_count = 17
#4  0x000000000042658f in update_frame (f=f <at> entry=0xcde8f8, force_p=true, 
    force_p <at> entry=false, inhibit_hairy_id_p=inhibit_hairy_id_p <at> entry=false) at dispnew.c:3122
        paused_p = <optimized out>
#5  0x00000000004673ec in redisplay_internal () at xdisp.c:13786
        gcscrollbars = <optimized out>
        w = <optimized out>
        sw = <optimized out>
        pending = <optimized out>
        must_finish = <optimized out>
        match_p = <optimized out>
        tlbufpos = <optimized out>
        tlendpos = <optimized out>
        number_of_visible_frames = <optimized out>
        sf = <optimized out>
        polling_stopped_here = true
        tail = <optimized out>
        consider_all_windows_p = <optimized out>
        update_miniwindow_p = true
#6  0x0000000000469c05 in redisplay () at xdisp.c:13005
#7  0x000000000052ecb3 in read_char (commandflag=commandflag <at> entry=1, map=map <at> entry=59608243, prev_event=0, used_mouse_menu=used_mouse_menu <at> entry=0x7fffffffc7ab, end_time=end_time <at> entry=0x0) at keyboard.c:2542
        c = <optimized out>
        local_getcjmp = 
                {{__jmpbuf = {28704, 30758517, 30758512, 5863648, 30758512, 140737488340400, 5, 5920429}, __mask_was_saved = 19008016, __saved_mask = {__val = {2, 1775, 7102, 0, 0, 140737488340288, 29553472, 40325112, 1, 140737488340400, 5, 59470720, 5921539, 15734320, 0, 8}}}}
        save_jump = 
                {{__jmpbuf = {140737488340344, 160, 140737488340320, 0, 140737488340528, 5919548, 0, 0}, __mask_was_saved = 44920531, __saved_mask = {__val = {140737488340400, 140737488340544, 4, 140737488340384, 26, 28704, 6305298, 3, 5841089, 0, 0, 30758512, 17573120, 8, 5841883, 17723280}}}}
        tem = <optimized out>
        save = <optimized out>
        previous_echo_area_message = 0
        also_record = 0
        reread = false
        polling_stopped_here = false
        orig_kboard = 0x14b53f0
#8  0x0000000000531dfe in read_key_sequence (keybuf=keybuf <at> entry=0x7fffffffc880, prompt=prompt <at> entry=0, dont_downcase_last=dont_downcase_last <at> entry=false, can_return_switch_frame=can_return_switch_frame <at> entry=true, fix_current_buffer=fix_current_buffer <at> entry=true, prevent_redisplay=prevent_redisplay <at> entry=false, bufsize=30) at keyboard.c:9156
        interrupted_kboard = 0x14b53f0
        interrupted_frame = 0xcde8f8
        key = <optimized out>
        used_mouse_menu = false
        echo_local_start = 0
        last_real_key_start = <optimized out>
        keys_local_start = <optimized out>
        new_binding = <optimized out>
        t = <optimized out>
        echo_start = 0
        keys_start = 0
        current_binding = 59608243
        first_event = 0
        first_unbound = 31
        mock_input = 0
        fkey = {parent = 16689603, map = 16689603, start = 0, end = 0}
        keytran = {parent = 13412931, map = 13412931, start = 0, end = 0}
        indec = {parent = 16689651, map = 16689651, start = 0, end = 0}
        shift_translated = false
        delayed_switch_frame = 0
        original_uppercase = 4611686018528051200
        original_uppercase_position = -1
        dummyflag = false
        starting_buffer = 0x1d55670
        fake_prefixed_keys = 0
#9  0x00000000005340a0 in command_loop_1 () at keyboard.c:1407
        cmd = <optimized out>
        keybuf = 
          {342, 10298149, 0, 10298144, 8009568, 96, 4611686018628714496, 4611686019484352512, 140737488341376, 5917890, 19, 336, 4, 140733193388084, 0, 3, 0, 27696, 27696, 0, 0, 4611686018528051200, 4611686019484352512, 5846229, 64, 21637280, 140737488341636, 5916298, 0, 0}
        i = <optimized out>
        prev_modiff = 156
        prev_buffer = 0x1c95140
#10 0x00000000005a3ecb in internal_condition_case (bfun=bfun <at> entry=0x533de0 <command_loop_1>, handlers=handlers <at> entry=18624, hfun=hfun <at> entry=0x528f60 <cmd_error>) at eval.c:1348
        val = <optimized out>
        c = <optimized out>
#11 0x000000000052317c in command_loop_2 (ignore=ignore <at> entry=0) at keyboard.c:1139
        val = 128
#12 0x00000000005a3dd3 in internal_catch (tag=tag <at> entry=44352, func=func <at> entry=0x523160 <command_loop_2>, arg=arg <at> entry=0) at eval.c:1108
        val = <optimized out>
        c = <optimized out>
#13 0x0000000000523137 in command_loop () at keyboard.c:1118
#14 0x0000000000528ab8 in recursive_edit_1 () at keyboard.c:728
        val = <optimized out>
#15 0x0000000000528e05 in Frecursive_edit () at keyboard.c:799
        buffer = <optimized out>
#16 0x000000000041ad08 in main (argc=<optimized out>, argv=0x7fffffffcbf8) at emacs.c:1626
        dummy = 140737488341664
        stack_bottom_variable = -1 '\377'
        do_initial_setlocale = <optimized out>
        dumping = <optimized out>
        skip_args = 0
        rlim = {rlim_cur = 8720000, rlim_max = 18446744073709551615}
        no_loadup = false
        junk = 0x0
        dname_arg = 0x0
        ch_to_dir = 0x0
        original_pwd = <optimized out>
Undefined command: "xbacktrace".  Try "help".
Undefined command: "2backtrace".  Try "help".
Undefined command: "exit".  Try "help".
A debugging session is active.

	Inferior 1 [process 2012] will be killed.

Quit anyway? (y or n) 



In GNU Emacs 25.0.50.1 (x86_64-suse-linux-gnu, GTK+ Version 3.14.13)
 of 2015-06-05 on xieshaij
System Description:	openSUSE 13.2 (Harlequin) (x86_64)

Configured using:
 `configure --with-rsvg --with-gif --with-xft --prefix=/home/zack/ins
 --enable-checking=yes'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS NOTIFY
ACL GNUTLS LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
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  show-paren-mode: t
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  electric-pair-mode: t
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  rainbow-identifiers-mode: t
  highlight-numbers-mode: t
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  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
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  line-number-mode: t

Recent messages:
Loading /home/zack/.emacs.d/elpa/yasnippet-20150415.244/snippets/prog-mode/.yas-setup...done
Starting Emacs daemon.
When done with this frame, type C-x 5 0 [2 times]
nil
[yas] Loading for `text-mode', just-in-time: (lambda nil (yas--load-directory-1 (quote /home/zack/.emacs.d/elpa/yasnippet-20150415.244/snippets/text-mode) (quote text-mode)))!
[yas] Loading compiled snippets from /home/zack/.emacs.d/elpa/yasnippet-20150415.244/snippets/text-mode
When done with a buffer, type C-x #
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kill-region: The mark is not set now, so there is no region
delete-backward-char: Text is read-only

Load-path shadows:
/home/zack/.emacs.d/elpa/flim-20150522.1642/md4 hides /home/zack/ins/share/emacs/25.0.50/lisp/md4
/home/zack/.emacs.d/elpa/flim-20150522.1642/hex-util hides /home/zack/ins/share/emacs/25.0.50/lisp/hex-util
/home/zack/.emacs.d/elpa/flim-20150522.1642/sasl hides /home/zack/ins/share/emacs/25.0.50/lisp/net/sasl
/home/zack/.emacs.d/elpa/flim-20150522.1642/ntlm hides /home/zack/ins/share/emacs/25.0.50/lisp/net/ntlm
/home/zack/.emacs.d/elpa/flim-20150522.1642/hmac-md5 hides /home/zack/ins/share/emacs/25.0.50/lisp/net/hmac-md5
/home/zack/.emacs.d/elpa/flim-20150522.1642/sasl-ntlm hides /home/zack/ins/share/emacs/25.0.50/lisp/net/sasl-ntlm
/home/zack/.emacs.d/elpa/flim-20150522.1642/hmac-def hides /home/zack/ins/share/emacs/25.0.50/lisp/net/hmac-def
/home/zack/.emacs.d/elpa/flim-20150522.1642/sasl-digest hides /home/zack/ins/share/emacs/25.0.50/lisp/net/sasl-digest
/home/zack/.emacs.d/elpa/flim-20150522.1642/sasl-cram hides /home/zack/ins/share/emacs/25.0.50/lisp/net/sasl-cram

Features:
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Message #8 received at 20748 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: zack <at> apertron.net
Cc: 20748 <at> debbugs.gnu.org
Subject: Re: bug#20748: 25.0.50; Seemingly random segfaults.
Date: Sat, 06 Jun 2015 10:43:47 +0300

> From: zack <at> apertron.net
> Date: Fri, 05 Jun 2015 19:51:43 +0000
> 
> Starting program: /home/zack/ins/bin/emacs 
> Got object file from memory but can't read symbols: File truncated.

A strange message, don't you think?

> Program received signal SIGSEGV, Segmentation fault.
> turn_on_face (f=f <at> entry=0xcde8f8, face_id=face_id <at> entry=74) at term.c:1902
> 1902	  unsigned long fg = face->foreground;
> #0  0x00000000004dc28a in turn_on_face (f=f <at> entry=0xcde8f8, face_id=face_id <at> entry=74) at term.c:1902
>         face = 0x0

Please show the output of these GDB commands:

 (gdb) frame 0
 (gdb) p f->face_cache->used

The first command assumes that "frame 0" is the one shown above, a
call to turn_on_face.  The frame number is that #0 part at the left
edge of the line.  If the next time it happens you will see the call
to turn_on_face in a different stack frame, use that frame's number
instead of zero in the first command above.

Did you build this Emacs yourself?  If so, can you also build a
non-optimized version, and see if the problem happens there?  To build
a non-optimized Emacs, configure it like this:

  CFLAGS='-O0 -g3' ./configure --enable-checking='yes,glyphs' ...

Replace "..." with the rest of your configure-time options.

Finally, do you have a lot of customizations in your ~/.emacs?  I'm
puzzled by the large number of the face ID (74) in the backtrace -- do
you customize your faces a lot, or use packages that create a lot of
faces?

Thanks.

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

From: Zack Piper <zack <at> apertron.net>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#20748: 25.0.50; Seemingly random segfaults.
Date: Sat, 6 Jun 2015 09:54:26 +0000

> > Starting program: /home/zack/ins/bin/emacs 
> > Got object file from memory but can't read symbols: File truncated.
> 
> A strange message, don't you think?

I thought that as well.
> 
> Did you build this Emacs yourself?  If so, can you also build a
> non-optimized version, and see if the problem happens there? 

I built it myself, yes.

When compiling without optimizations I can't seem to reproduce it.

This is strange, sorry for not being of much help.

Since it's compiled without optimizations now, is this a bug in GCC
itself? I doubt it, but here's my version anyway:

gcc (SUSE Linux) 4.8.3 20140627 [gcc-4_8-branch revision 212064]
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.



> Finally, do you have a lot of customizations in your ~/.emacs?  I'm
> puzzled by the large number of the face ID (74) in the backtrace -- do
> you customize your faces a lot, or use packages that create a lot of
> faces?

I use a lot of packages.

`M-x list-faces-display RET' (I think that's the correct command) lists ~703.

-- 
Zack Piper <zack <at> apertron.net> http://apertron.net

Message #14 received at 20748 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Zack Piper <zack <at> apertron.net>
Cc: 20748 <at> debbugs.gnu.org
Subject: Re: bug#20748: 25.0.50; Seemingly random segfaults.
Date: Sat, 06 Jun 2015 22:09:25 +0300

> Date: Sat, 6 Jun 2015 09:54:26 +0000
> From: Zack Piper <zack <at> apertron.net>
> 
> > Did you build this Emacs yourself?  If so, can you also build a
> > non-optimized version, and see if the problem happens there? 
> 
> I built it myself, yes.
> 
> When compiling without optimizations I can't seem to reproduce it.

Then I guess we will have to debug it in the optimized build.  But
before you get back to that, could you try a slightly different
configuration:

  CFLAGS='-Og -g3' ./configure --enable-checking='yes,glyphs' ...

(If -Og doesn't work with your GCC, try -O1 instead.)

If this build doesn't reproduce the crash, just rebuild with full
optimizations.

> Since it's compiled without optimizations now, is this a bug in GCC
> itself?

No, it's just an Emacs bug that shows up in optimized code.

> > Finally, do you have a lot of customizations in your ~/.emacs?  I'm
> > puzzled by the large number of the face ID (74) in the backtrace -- do
> > you customize your faces a lot, or use packages that create a lot of
> > faces?
> 
> I use a lot of packages.
> 
> `M-x list-faces-display RET' (I think that's the correct command) lists ~703.

OK.  So I'd like to see the output of those 2 GDB command in a build
that does crash.  Thanks.

Message #17 received at 20748 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Zack Piper <zack <at> apertron.net>, 20748 <at> debbugs.gnu.org
Subject: Re: bug#20748: 25.0.50; Seemingly random segfaults.
Date: Tue, 28 Nov 2017 21:05:30 -0500

tags 20748 moreinfo unreproducible
close 20748
quit

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

> OK.  So I'd like to see the output of those 2 GDB command in a build
> that does crash.  Thanks.

Since OP hasn't responded, it seems unlikely we'll be able to do
anything more here.

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