problem with ejabberd on container OpenVZ

Help me!!!
We have cluster ejabberd 14.07-63, one of node run in OpenVZ container. This node has crashed when number of users near 4000 - 5000. /var/log/ejabberd/error.log is empty, crash.log and core dump are not created.
The only message about the crash was founf on host machine in /var/log/audit/audit.log
type=ANOM_ABEND msg=audit(1445326112.058:22103): auid=4294967295 uid=1000 gid=1000 ses=21154 pid=266508 comm="beam.smp" sig=11
What is that?

core dump file

core dump file contents:
warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7fff959ae000
Core was generated by `/usr/lib/erlang/erts-5.10.4/bin/beam.smp -K true -P 1100000 -- -root /usr/lib/e'.
Program terminated with signal 11, Segmentation fault.
#0 0x00007eff2a0faaf3 in ?? ()

I tried ejabberd 14.12, the

I tried ejabberd 14.12, the result is the same.

I tried ejabberd 15.10, I

I tried ejabberd 15.10, I tried LXC and qemu-kvm the result is the same.

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