Description of problem:

RPC related core seen on a test system configured with tier volume. Unfortunately no logs or steps to reproduce are available as this was generated more than a day back.

Filing this bug anyway, as we have backtrace available.

#0  0x00007f5c1cd8aa17 in list_add (head=0x7f5c1e78ecb8, new=0x7f5c1e79b4c0) at list.h:33
#1  __iobuf_get (iobuf_arena=0x7f5c1e78ec60, page_size=page_size@entry=128) at iobuf.c:565
#2  0x00007f5c1cd8b14d in iobuf_get2 (iobuf_pool=0x7f5c1e78ee10, page_size=<optimized out>) at iobuf.c:669
#3  0x00007f5c119daac1 in __socket_proto_state_machine (pollin=<synthetic pointer>, this=0x7f5c1e7f6050)
    at socket.c:2196
#4  socket_proto_state_machine (pollin=<synthetic pointer>, this=0x7f5c1e7f6050) at socket.c:2331
#5  socket_event_poll_in (this=this@entry=0x7f5c1e7f6050) at socket.c:2347
#6  0x00007f5c119dd604 in socket_event_handler (fd=fd@entry=9, idx=idx@entry=1, data=0x7f5c1e7f6050, poll_in=1, 
    poll_out=0, poll_err=0) at socket.c:2464
#7  0x00007f5c1cdb7b9a in event_dispatch_epoll_handler (event=0x7f5c0fd00e80, event_pool=0x7f5c1e7aacb0)
    at event-epoll.c:575
#8  event_dispatch_epoll_worker (data=0x7f5c1e7f8980) at event-epoll.c:678
#9  0x00007f5c1bbb1dc5 in start_thread () from /lib64/libpthread.so.0
#10 0x00007f5c1b4f728d in clone () from /lib64/libc.so.6


Version-Release number of selected component (if applicable):
glusterfs-server-3.7.9-4.el7rhgs.x86_64

How reproducible:
seen once

Steps to Reproduce:
Yet to determine

Actual results:


Expected results:


Additional info:
core dump shall be attached shortly.