Re: allocation within critical sections

[Ludovic Courtès]

Hi,

Andy Wingo <address@hidden> skribis:

> Andy, who got the following backtrace, with wip-threads-and-fork:
>
> #0 0x00007f5daf443cec in __lll_lock_wait () from
> /lib/x86_64-linux-gnu/libpthread.so.0 #1 0x00007f5daf43f339 in
> _L_lock_926 () from /lib/x86_64-linux-gnu/libpthread.so.0 #2
> 0x00007f5daf43f15b in pthread_mutex_lock () from
> /lib/x86_64-linux-gnu/libpthread.so.0 #3 0x00007f5dafba8563 in
> finalize_port (ptr=0x3dac5a0, data=<optimized out>) at ports.c:575 #4
> finalize_port (ptr=0x3dac5a0, data=<optimized out>) at ports.c:551 #5
> 0x00007f5daee5851e in GC_invoke_finalizers () at finalize.c:872 #6
> 0x00007f5daee5876e in GC_notify_or_invoke_finalizers () at
> finalize.c:951 #7 0x00007f5daee5ab4d in GC_generic_malloc_many (lb=16,
> k=1, result=0x7f5daf080d30) at mallocx.c:290 #8 0x00007f5daee640a1 in
> GC_malloc (bytes=16) at thread_local_alloc.c:177 #9 0x00007f5dafba690e
> in scm_cell (cdr=772, car=2052) at ../libguile/gc.h:204 #10 scm_cons
> (x=<optimized out>, y=0x304) at pairs.c:77 #11 0x00007f5dafb8cc6e in
> scm_make_list (n=<optimized out>, init=0x804) at list.c:120 #12
> 0x00007f5dafb82c39 in finalize_guarded (ptr=<optimized out>,
> finalizer_data=<optimized out>) at guardians.c:124 #13
> 0x00007f5daee5851e in GC_invoke_finalizers () at finalize.c:872 #14
> 0x00007f5daee5876e in GC_notify_or_invoke_finalizers () at
> finalize.c:951 #15 0x00007f5daee5ab4d in GC_generic_malloc_many
> (lb=16, k=1, result=0x7f5daf080d30) at mallocx.c:290 #16
> 0x00007f5daee640a1 in GC_malloc (bytes=16) at thread_local_alloc.c:177
> #17 0x00007f5dafba690e in scm_cell (cdr=65961984, car=36468752) at
> ../libguile/gc.h:204 #18 scm_cons (x=<optimized out>, y=0x3ee8000) at
> pairs.c:77 #19 0x00007f5dafbf5b6f in lock_all_weak_tables
> (unused=<optimized out>) at weak-table.c:762 #20 0x00007f5dafbf8c97 in
> before_fork () at posix.c:1295 #21 scm_fork () at posix.c:1328

Can you explain what happens here?  Is it a deadlock?  What’s at ports.c:575?

Thanks,
Ludo’.