GNU bug report logs - #40737
Segfault in arm gcc7, thumb2 builroot, with arm patch

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: dsmich <at> roadrunner.com
Subject: bug#40737: closed (40737-done <at> debbugs.gnu.org)
Date: Mon, 22 Jun 2020 15:19:02 +0000

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Your bug report

#40737: Segfault in arm gcc7, thumb2 builroot, with arm patch

which was filed against the guile package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 40737 <at> debbugs.gnu.org.

-- 
40737: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=40737
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Dale Smith <dalepsmith <at> gmail.com>
To: 40737-done <at> debbugs.gnu.org
Subject: 40737-done <at> debbugs.gnu.org
Date: Mon, 22 Jun 2020 11:18:08 -0400

Fixed in the 3.0.3 release by commit 7e814190e

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From: dsmich <at> roadrunner.com
To: "'bug-guile <at> gnu.org'" <bug-guile <at> gnu.org>
Subject: Segfault in arm gcc7, thumb2 builroot, with arm patch
Date: Mon, 20 Apr 2020 19:34:28 +0000

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Here is a backtrace of running guile on a builtroot constructed system
for rpi3.
Thumb2 instructions: BR2_ARM_INSTRUCTIONS_THUMB2=y
Gcc 7.5: BR2_GCC_VERSION="7.5.0"
Glibc.

Uses the patch from
https://gitlab.com/wingo/lightening/-/merge_requests/3

I hope this makes it through the mail client ok. 

-Dale

Core was generated by `guile'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x76ee6f12 in ?? ()
[Current thread is 1 (LWP 507)]
(gdb) thread apply all backtrace

Thread 5 (LWP 508):
#0 0x76e59674 in __libc_do_syscall () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#1 0x76e5499e in pthread_cond_wait@@GLIBC_2.4 () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#2 0x76e7d7aa in GC_wait_marker () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#3 0x76e7dab0 in GC_help_marker () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#4 0x76e7db26 in GC_mark_thread () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#5 0x76e4fbb0 in start_thread () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#6 0x76b450ec in ?? () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt
stack?)

Thread 4 (LWP 510):
#0 0x76e59674 in __libc_do_syscall () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#1 0x76e5499e in pthread_cond_wait@@GLIBC_2.4 () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#2 0x76e7d7aa in GC_wait_marker () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#3 0x76e7dab0 in GC_help_marker () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#4 0x76e7db26 in GC_mark_thread () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#5 0x76e4fbb0 in start_thread () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#6 0x76b450ec in ?? () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt
stack?)

Thread 3 (LWP 511):
#0 0x76e59674 in __libc_do_syscall () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#1 0x76e57720 in read () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#2 0x76ef8aee in read_finalization_pipe_data (data=0x74c1f95c) at
finalizers.c:205
#3 0x76e7cea8 in GC_do_blocking_inner () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#4 0x76e7b068 in GC_with_callee_saves_pushed () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#5 0x76e7b094 in GC_do_blocking () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#6 0x76f3f10c in scm_without_guile (func=0x76ef8add , data=0x74c1f95c)
at threads.c:706
#7 0x76ef8d7a in finalization_thread_proc (unused=) at
finalizers.c:218
#8 0x76eef876 in c_body (d=0x74c1fe1c) at continuations.c:430
#9 0x76f4298e in vm_debug_engine (thread=0x76a46c00) at
vm-engine.c:972
#10 0x76f47b9c in scm_call_n (proc=0x7521dc70,
argv=argv <at> entry=0x74c1fbc0, nargs=nargs <at> entry=2) at vm.c:1608
#11 0x76ef22c4 in scm_call_2 (proc=, arg1=, arg2=) at eval.c:503
#12 0x76ef31a2 in scm_c_with_exception_handler (type=type <at> entry=0x404,
handler=0x76f3f9b9 , handler_data=handler_data <at> entry=0x74c1fda8, 
 thunk=0x76f3fa7d , thunk_data=thunk_data <at> entry=0x74c1fda8) at
exceptions.c:170
#13 0x76f3fbd4 in scm_c_catch (tag=tag <at> entry=0x404,
body=body <at> entry=0x76eef86d , body_data=body_data <at> entry=0x74c1fe1c, 
 handler=handler <at> entry=0x76eefa1d ,
handler_data=handler_data <at> entry=0x74c1fe1c, 
 pre_unwind_handler=pre_unwind_handler <at> entry=0x76eef8fb ,
pre_unwind_handler_data=pre_unwind_handler_data <at> entry=0x751fc300) at
throw.c:168
--Type  for more, q to quit, c to continue without paging--c
#14 0x76eefba2 in scm_i_with_continuation_barrier (body=0x76eef86d ,
body_data=body_data <at> entry=0x74c1fe1c, handler=0x76eefa1d ,
handler_data=handler_data <at> entry=0x74c1fe1c,
pre_unwind_handler=0x76eef8fb , pre_unwind_handler_data=0x751fc300) at
continuations.c:368
#15 0x76eefc06 in scm_c_with_continuation_barrier (func=, data=) at
continuations.c:464
#16 0x76f3edd4 in with_guile (base=0x74c1fe4c, data=0x74c1fe64) at
threads.c:645
#17 0x76e78e98 in GC_call_with_stack_base () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#18 0x76f3f0cc in scm_i_with_guile (dynamic_state=, data=, func=) at
threads.c:688
#19 scm_with_guile (func=, data=) at threads.c:694
#20 0x76e4fbb0 in start_thread () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#21 0x76b450ec in ?? () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt
stack?)

Thread 2 (LWP 509):
#0 0x76e59674 in __libc_do_syscall () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#1 0x76e5499e in pthread_cond_wait@@GLIBC_2.4 () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#2 0x76e7d7aa in GC_wait_marker () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#3 0x76e7dab0 in GC_help_marker () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#4 0x76e7db26 in GC_mark_thread () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#5 0x76e4fbb0 in start_thread () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#6 0x76b450ec in ?? () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt
stack?)

Thread 1 (LWP 507):
#0 0x76ee6f12 in scm_is_pair (x=0x0) at pairs.h:182
#1 scm_sloppy_assq (key=0x752076f0, alist=0x0) at alist.c:59
#2 0x76effef8 in scm_hash_fn_ref (table=table <at> entry=0x751da8b0,
obj=obj <at> entry=0x752076f0, dflt=dflt <at> entry=0x4,
hash_fn=hash_fn <at> entry=0x76eff79d , assoc_fn=0x76ee6f0d ,
closure=closure <at> entry=0x0) at hashtab.c:300
#3 0x76efff5c in scm_hashq_ref (table=0x751da8b0,
key=key <at> entry=0x752076f0, dflt=0x4, dflt <at> entry=0x904) at hashtab.c:426
#4 0x76f11f74 in scm_module_variable (module=0x74f281e0,
sym=0x752076f0) at modules.c:500
#5 0x76f430c4 in vm_debug_engine (thread=0x76a46e00) at
vm-engine.c:1560
#6 0x76f47b9c in scm_call_n (proc=0x74107800,
argv=argv <at> entry=0x7eb8fb64, nargs=nargs <at> entry=1) at vm.c:1608
#7 0x76ef22b0 in scm_call_1 (proc=, arg1=) at eval.c:496
#8 0x76f4298e in vm_debug_engine (thread=0x76a46e00) at
vm-engine.c:972
#9 0x76f47b9c in scm_call_n (proc=0x7521dc30,
argv=argv <at> entry=0x7eb8fdb0, nargs=nargs <at> entry=4) at vm.c:1608
#10 0x76ef22f4 in scm_call_4 (proc=, arg1=arg1 <at> entry=0x751fc300,
arg2=arg2 <at> entry=0x74d09810, arg3=arg3 <at> entry=0x76a4ab60,
arg4=arg4 <at> entry=0x7416c0b8) at eval.c:517
#11 0x76eea9a0 in scm_print_exception (port=port <at> entry=0x751fc300,
frame=frame <at> entry=0x74d09810, key=key <at> entry=0x76a4ab60,
args=args <at> entry=0x7416c0b8) at backtrace.c:121
#12 0x76eef994 in print_exception_and_backtrace (args=0x7416c0b8,
tag=0x76a4ab60, port=0x751fc300) at continuations.c:415
#13 pre_unwind_handler (error_port=0x751fc300, tag=0x76a4ab60,
args=0x7416c0b8) at continuations.c:453
#14 0x76f3fa2e in catch_pre_unwind_handler (data=0x7eb91c18,
exn=0x74159fa0) at throw.c:135
#15 0x76f4298e in vm_debug_engine (thread=0x76a46e00) at
vm-engine.c:972
#16 0x76f47b9c in scm_call_n (proc=proc <at> entry=0x7521dc50,
argv=0x7eb90068, nargs=5) at vm.c:1608
#17 0x76ef245a in scm_apply_0 (proc=0x7521dc50, args=0x304) at
eval.c:603
#18 0x76ef2afa in scm_apply_1 (proc=, arg1=arg1 <at> entry=0x76a4ab60,
args=args <at> entry=0x74d098c8) at eval.c:609
#19 0x76f3fd1c in scm_throw (key=0x76a4ab60, key <at> entry=0x76f8bd90 ,
args=0x74d098c8) at throw.c:262
#20 0x76f3fe22 in scm_ithrow (key=key <at> entry=0x76f8bd90 , args=,
no_return=no_return <at> entry=1) at throw.c:457
#21 0x76ef0e66 in scm_error_scm (key=key <at> entry=0x76f8bd90 ,
subr=subr <at> entry=0x4, message=message <at> entry=0x76a4ab60,
args=args <at> entry=0x304, data=0x74d09948) at error.c:90
#22 0x76f41c4a in bind_kwargs (thread=, npositional=, nlocals=14,
kwargs=0x75145ce0, strict=1 '01', allow_other_keys=0 '00') at
vm.c:1015
#23 0x7500c6e4 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt
stack?)

(gdb) info reg
r0 0x752076f0 1965061872
r1 0x0 0
r2 0x0 0
r3 0x76ee6f0d 1995337485
r4 0x4 4
r5 0x76f7c000 1995948032
r6 0x751da8b0 1964878000
r7 0x752076f0 1965061872
r8 0x3 3
r9 0x74c6d160 1959186784
r10 0x76f8c7e4 1996015588
r11 0x76f7c000 1995948032
r12 0x76f7c288 1995948680
sp 0x7eb8f8d8 0x7eb8f8d8
lr 0x76effef9 1995439865
pc 0x76ee6f12 0x76ee6f12 
cpsr 0x40000030 1073741872
fpscr 0x0 0

(gdb) disassem /r 0x76ee6f12,+8
Dump of assembler code from 0x76ee6f12 to 0x76ee6f1a:
=> 0x76ee6f12 : 0b 68 ldr r3, [r1, #0]
 0x76ee6f14 : da 07 lsls r2, r3, #31
 0x76ee6f16 : 0a d4 bmi.n 0x76ee6f2e 
 0x76ee6f18 : 13 f0 06 0f tst.w r3, #6
End of assembler dump.

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