[rabbitmq-discuss] Consumer gets blocked leaving messages unacknowledged

[Jagadish Nadimpalli]

Hello,

I am using rabbitmq server and python-kombu client library for RPC
communication. It is observed that the client stops consuming the messages
from the queue and all these messages remain unacknowledged.

We found the following link which is near to our problem. But, we observe
that open fds are not greater that the max limit (1024). Anything else can
lead to this situation?
http://lists.rabbitmq.com/pipermail/rabbitmq-discuss/2014-May/036063.html

Following is the rabbitmq version.

[{rabbit,"RabbitMQ","3.0.2"},
                       {os_mon,"CPO  CXC 138 46","2.2.9"},
                       {mnesia,"MNESIA  CXC 138 12","4.7"},
                       {sasl,"SASL  CXC 138 11","2.2.1"},
                       {stdlib,"ERTS  CXC 138 10","1.18.1"},
                       {kernel,"ERTS  CXC 138 10","2.15.1"}]},

The RPC client stack is as following. Looks like it is struck for some
reason. Did anybody observe this issue?

cat /proc/12733/stack
[<ffffffff811a6609>] poll_schedule_timeout+0x49/0x70
[<ffffffff811a7d34>] do_sys_poll+0x424/0x4d0
[<ffffffff811a7e1c>] do_restart_poll+0x3c/0x70
[<ffffffff8106eabf>] sys_restart_syscall+0x1f/0x30
[<ffffffff816d379d>] system_call_fastpath+0x1a/0x1f
[<ffffffffffffffff>] 0xffffffffffffffff

Attaching strace to client process show the following.
restart_syscall(<... resuming interrupted call ...>

Thanks,
Jagadish
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