Heisenbug concerning bigallocs init (on GCC 15.2) #179
Description
There seems to be some kind of Heisenbug causing intermittent aborts. I'll keep my log my findings and fixes under this issue. I don't have time to work on this right now, perhaps in a couple of days.
Interestingly, a debugger seems to prevent the error from appearing. Some kind of init issue?
Here is a bt from a gdb attached after the fault occurs. It is an init issue!
(gdb) bt
#0 0x00007e837d9a0423 in do_syscall6 (gsp=0x7fffc20cc9c0)
at /home/zoltan/Develop/pycallocs/contrib/liballocs/contrib/libsystrap/src/../src/do-syscall.h:170
#1 do_real_syscall (gsp=0x7fffc20cc9c0)
at /home/zoltan/Develop/pycallocs/contrib/liballocs/contrib/libsystrap/src/../src/do-syscall.h:218
#2 do_generic_syscall_and_fixup (gsp=0x7fffc20cc9c0)
at /home/zoltan/Develop/pycallocs/contrib/liballocs/contrib/libsystrap/src/../src/do-syscall.h:312
--Type <RET> for more, q to quit, c to continue without paging--c
#3 handle_sigill (n=<optimised out>)
at /home/zoltan/Develop/pycallocs/contrib/liballocs/contrib/libsystrap/src/../src/sigill.c:271
#4 <signal handler called>
#5 0x00007e837d4a00cc in __internal_syscall_cancel (a1=a1@entry=0, a2=a2@entry=0, a3=a3@entry=140736449009536,
a4=a4@entry=140736449009536, a5=a5@entry=0, a6=a6@entry=0, nr=230) at ./nptl/cancellation.c:40
#6 0x00007e837d4f62f2 in __GI___clock_nanosleep (clock_id=<optimised out>, clock_id@entry=0, flags=flags@entry=0,
req=req@entry=0x7fffc20cd780, rem=rem@entry=0x7fffc20cd780) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:48
#7 0x00007e837d503fd7 in __GI___nanosleep (req=req@entry=0x7fffc20cd780, rem=rem@entry=0x7fffc20cd780)
at ../sysdeps/unix/sysv/linux/nanosleep.c:25
#8 0x00007e837d51ad8e in __sleep (seconds=0) at ../sysdeps/posix/sleep.c:55
#9 0x00007e837d988c01 in abort () at /home/zoltan/Develop/pycallocs/contrib/liballocs/src/../src/preload.c:365
#10 0x00007e837d988ce1 in __assert_fail (
assertion=0x7e837dd1bbb8 "file_bigalloc && \"file bigallocs have not been initialized\"",
file=0x7e837dd1bb68 "/home/zoltan/Develop/pycallocs/contrib/liballocs/src/../src/allocsites.c", line=98,
function=0x7e837dd1bd40 <__PRETTY_FUNCTION__.1> "get_file")
at /home/zoltan/Develop/pycallocs/contrib/liballocs/src/../src/preload.c:399
#11 0x00007e837d95ad9c in get_file (allocsite=0x74565b2150da)
at /home/zoltan/Develop/pycallocs/contrib/liballocs/src/../src/allocsites.c:98
#12 0x00007e837d95adca in __liballocs_find_allocsite_entry_at (allocsite=0x74565b2150da)
at /home/zoltan/Develop/pycallocs/contrib/liballocs/src/../src/allocsites.c:106
#13 0x00007e837d971d66 in extract_and_output_alloc_site_and_type (p_ins=0x64568c1749e0, out_type=0x7fffc20cda58,
out_site=0x0) at /home/zoltan/Develop/pycallocs/contrib/liballocs/src/../include/generic_malloc_index.h:776
#14 0x00007e837d971a57 in __generic_malloc_get_info (a=0x7e837df29c40 <__global_malloc_allocator>,
sizefn=0x7e837d971f18 <__default_lib_malloc_usable_size>, obj=0x64568c1749c0,
maybe_the_allocation=0x7e837e11bee8 <big_allocations+1224>, out_type=0x7fffc20cda58, out_base=0x0,
out_size=0x0, out_site=0x0)
at /home/zoltan/Develop/pycallocs/contrib/liballocs/src/../include/generic_malloc_index.h:707
#15 0x00007e837d972380 in get_info (obj=0x64568c1749c0, maybe_the_allocation=0x7e837e11bee8 <big_allocations+1224>,
out_type=0x7fffc20cda58, out_base=0x0, out_size=0x0, out_site=0x0)
at /home/zoltan/Develop/pycallocs/contrib/liballocs/src/../src/allocators/default-lib-malloc.c:47
#16 0x00007e837d967440 in __liballocs_get_alloc_info (obj=0x64568c1749c0, out_allocator=0x0, out_alloc_start=0x0,
out_alloc_size_bytes=0x0, out_alloc_uniqtype=0x7fffc20cda58, out_alloc_site=0x0)
at /home/zoltan/Develop/pycallocs/contrib/liballocs/src/../include/liballocs.h:651
#17 0x00007e837d968492 in __liballocs_get_type (obj=0x64568c1749c0)
at /home/zoltan/Develop/pycallocs/contrib/liballocs/src/../src/query.c:72
#18 0x000064565b2150e5 in main () at offsetof.c:25