[erlang-questions] [erlang-bugs] beam core file R17

Matthew Evans <>
Sun May 29 18:04:16 CEST 2016


Thanks, this software does use nifs

Sent from my iPhone

> On May 29, 2016, at 11:56 AM, Mikael Pettersson <> wrote:
> 
> Matthew Evans writes:
>> Hi,
>> This core was found on a live system (R17):
>> 
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>> 
>> 10:16:38:# erl
>> Erlang/OTP 17 [erts-6.2] [source] [64-bit] [smp:8:8] [async-threads:10] [hipe] [kernel-poll:false]
>> 
>> 
>> Eshell V6.2  (abort with ^G)
>> 1> 
>> 
>> ........
>> 
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>> 
>> May 28 22:18:56 [info   ] plexxi kernel: [1235119.885465] beam.smp[2267] general protection ip:4b698a sp:7faeb6a7d650 error:0 in beam.smp[400000+1ac000]
>> warning: Can't read pathname for load map: Input/output error.[Thread debugging using libthread_db enabled]Using host libthread_db library "/lib/libthread_db.so.1".Core was generated by `/usr/lib/erlang/erts-6.2/bin/beam.smp -K true -A 24 -P 350000 -- -root /usr/lib'.Program terminated with signal 11, Segmentation fault.#0  0x00000000004b698a in sweep_off_heap ()(gdb) bt#0  0x00000000004b698a in sweep_off_heap ()#1  0x00000000004b77d1 in do_minor ()#2  0x00000000004b8479 in erts_garbage_collect ()#3  0x00000000004e1374 in process_main ()#4  0x000000000048071d in sched_thread_func ()#5  0x0000000000549f89 in thr_wrapper ()#6  0x00007faeba32ba30 in start_thread () from /lib/libpthread.so.0#7  0x00007faeb9e8a53d in clone () from /lib/libc.so.6
> 
> It looks like your beam.smp binary lacks debugging information, so we only know the general
> area where it crashed (sweep_off_heap() as called from do_minor()).  Crashes here would usually
> be due to memory corruption, which could be caused by:
> - a bug in the VM
> - a bug in a NIF
> - a bug in HiPE
> - a bug in the C compiler used to compile the VM (I've seen that happen at least 3 times)
> - a HW error (though you'd then also find e.g. machine check events logged)
> 
> If you want to debug this, you should first ensure that your beam.smp gets built and installed
> with full debugging information (just attach gdb, bt, and list to verify).  You should also try
> without NIFs or native code, if those are used and you can configure them not to be.


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