GNU bug report logs - #10655
[2.0.3+] ‘queue_after_gc_hook’ called during thread startup leads to SIGSEGV

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From: Andy Wingo <wingo <at> pobox.com>
To: ludo <at> gnu.org (Ludovic Courtès)
Cc: 10655 <at> debbugs.gnu.org
Subject: bug#10655: [2.0.3+] ‘queue_after_gc_hook’ called during thread startup leads to SIGSEGV
Date: Mon, 30 Jan 2012 16:33:42 +0100

On Mon 30 Jan 2012 16:26, ludo <at> gnu.org (Ludovic Courtès) writes:

> #0  queue_after_gc_hook (hook_data=<value optimized out>, fn_data=<value optimized out>,
>     data=<value optimized out>) at gc.c:737
> #1  0x00007f236ea0518c in scm_c_hook_run (hook=0x7f236ed00a10, data=0x0) at hooks.c:103
> #2  0x00007f236e729951 in GC_notify_full_gc (stop_func=0x7f236e728e00 <GC_never_stop_func>)
>     at alloc.c:334
> #3  GC_try_to_collect_inner (stop_func=0x7f236e728e00 <GC_never_stop_func>) at alloc.c:429
> #4  GC_try_to_collect_inner (stop_func=0x7f236e728e00 <GC_never_stop_func>) at alloc.c:410
> #5  0x00007f236e72a65e in GC_collect_or_expand (needed_blocks=1, ignore_off_page=0,
>     retry=<value optimized out>) at alloc.c:1215
> #6  0x00007f236e72a7c6 in GC_allocobj (gran=42, kind=1) at alloc.c:1302
> #7  0x00007f236e72f61a in GC_generic_malloc_inner (lb=664, k=1) at malloc.c:121
> #8  0x00007f236e739aff in GC_new_thread (id=139790027667200) at pthread_support.c:478
> #9  0x00007f236e739fb7 in GC_register_my_thread_inner (sb=0x7f2366f12ed0,
>     my_pthread=<value optimized out>) at pthread_support.c:1358
> #10 0x00007f236e73a167 in GC_start_rtn_prepare_thread (pstart=0x7f2366f12eb0,
>     pstart_arg=0x7f2366f12eb8, sb=0x7f2366f12ed0, arg=0x2aa1fc0) at pthread_support.c:1449
> #11 0x00007f236e739993 in GC_inner_start_routine (sb=<value optimized out>,
>     arg=<value optimized out>) at pthread_start.c:50
> #12 0x00007f236e7348d5 in GC_call_with_stack_base (fn=<value optimized out>,
>     arg=<value optimized out>) at misc.c:1535
> #13 0x00007f236e504cec in start_thread ()
>    from /nix/store/vxycd107wjbhcj720hzkw2px7s7kr724-glibc-2.12.2/lib/libpthread.so.0
> #14 0x00007f236d0111ed in clone ()
>    from /nix/store/vxycd107wjbhcj720hzkw2px7s7kr724-glibc-2.12.2/lib/libc.so.6
>
> The problems seems to be that the after-gc-hook runs while the thread is
> being created and not yet a full-blown Guile thread.

Interesting.  I'll see what I can do.

A
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