[rabbitmq-discuss] beam blocking

[carlhoerberg]

Have a cluster where the nodes sometimes crash on high load, nothing is shown
in the rabbitmq logs, but this shows up in syslog:

kernel: [582840.748073] INFO: task beam:9794 blocked for more than 120
seconds.
kernel: [582840.748082] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
kernel: [582840.748088] beam            D ffff8800efc13700     0  9794  
9718 0x00000000
kernel: [582840.748092]  ffff8800e7bc3cb8 0000000000000282 0000000000000000
ffffffffffffffe0
kernel: [582840.748095]  ffff8800e7bc3fd8 ffff8800e7bc3fd8 ffff8800e7bc3fd8
0000000000013700
kernel: [582840.748098]  ffff88000249c4d0 ffff88000249ade0 00007f7c2aa289e0
ffff8800024b1180
kernel: [582840.748101] Call Trace:
kernel: [582840.748109]  [<ffffffff81659bbf>] schedule+0x3f/0x60
kernel: [582840.748113]  [<ffffffff8106c535>] exit_mm+0x85/0x130
kernel: [582840.748116]  [<ffffffff8106c74e>] do_exit+0x16e/0x450
kernel: [582840.748120]  [<ffffffff8109e4d9>] ?
futex_wait_queue_me+0xc9/0x100
kernel: [582840.748122]  [<ffffffff8109e14f>] ? __unqueue_futex+0x3f/0x80
kernel: [582840.748126]  [<ffffffff8107ad4a>] ? __dequeue_signal+0x6a/0xb0
kernel: [582840.748128]  [<ffffffff8106cbd4>] do_group_exit+0x44/0xa0
kernel: [582840.748131]  [<ffffffff8107d8cc>]
get_signal_to_deliver+0x21c/0x420
kernel: [582840.748135]  [<ffffffff81014825>] do_signal+0x45/0x130
kernel: [582840.748137]  [<ffffffff810a126c>] ? do_futex+0x7c/0x1b0
kernel: [582840.748139]  [<ffffffff810a14e2>] ? sys_futex+0x142/0x1a0
kernel: [582840.748142]  [<ffffffff81091d7f>] ? __put_cred+0x3f/0x50
kernel: [582840.748144]  [<ffffffff81014ad5>] do_notify_resume+0x65/0x80
kernel: [582840.748147]  [<ffffffff81664350>] int_signal+0x12/0x17

RabbitMQ 3.3.1, Erlang 17, ubuntu 12.04



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