[erlang-questions] segfault erts-5.10.4 (R16B03-1)

Lukas Larsson <>
Wed Sep 9 14:52:15 CEST 2015


On Wed, Sep 9, 2015 at 2:19 PM, Ahmed Omar <> wrote:

> ###
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
> Core was generated by `/var/lib/ejabberd/erts-5.10.4/bin/beam.smp -K true
> -A 128 -P 2500000 -Q 500000'.
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0  0x000000000044d299 in bf_get_free_block ()
> [Current thread is 1 (Thread 0x7fe077fbc700 (LWP 24141))]
> (gdb) bt full
> #0  0x000000000044d299 in bf_get_free_block ()
> No symbol table info available.
> #1  0x0000000000442fa6 in mbc_alloc ()
> No symbol table info available.
> #2  0x0000000000448803 in erts_alcu_alloc_thr_pref ()
> No symbol table info available.
> #3  0x0000000000509508 in erts_alloc ()
> No symbol table info available.
> #4  0x00000000005096de in erts_bs_append ()
> No symbol table info available.
> #5  0x000000000053c1f8 in process_main ()
> No symbol table info available.
> #6  0x000000000049da8b in sched_thread_func ()
> No symbol table info available.
> #7  0x00000000005bd146 in thr_wrapper ()
> No symbol table info available.
> #8  0x00000039a80079d1 in start_thread () from /lib64/libpthread.so.0
> No symbol table info available.
> #9  0x00000039a78e88fd in clone () from /lib64/libc.so.6
> No symbol table info available.
> ###
>
> I'll keep digging ...
>
>
It looks like you have a memory corruption issue. Normally when something
goes wrong in the memory allocators, it is because a badly written
nif/linked-in driver has written outside the buffer it requested by calling
driver/enif_alloc. I would take a deep long look at any native code that
you have running and see if you can find any such bugs. If you can
reproduce the error, I would attempt to run the same scenario in valgrind
as it is quite good at spotting these types of errors.

Lukas
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