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SubjectINFO: task rcu_kthread:6 blocked for more than 120 seconds.
I'm seeing rcu_kthread get stuck from time to time on ARM Versatile PB
(ARM926). Kernel is based upon commit 9e9bc973 (immediately prior to
the merge of the OMAP tree.)

~ # ps aux|grep rcu
root 6 0.0 0.0 0 0 ? S 02:31 0:01 [rcu_kthread]
root 502 9.0 0.3 3740 472 ttyAMA0 S+ 02:59 0:00 grep rcu
~ # ps aux|grep rcu
root 6 0.0 0.0 0 0 ? D 02:31 0:01 [rcu_kthread]
root 504 0.0 0.3 3740 472 ttyAMA0 S+ 03:00 0:00 grep rcu
~ # ps aux|grep rcu
root 6 0.0 0.0 0 0 ? D 02:31 0:01 [rcu_kthread]
root 506 0.0 0.3 3740 472 ttyAMA0 S+ 03:00 0:00 grep rcu
~ # ps aux|grep rcu
root 6 0.0 0.0 0 0 ? D 02:31 0:01 [rcu_kthread]
root 508 0.0 0.3 3740 472 ttyAMA0 S+ 03:00 0:00 grep rcu
~ # cat /proc/6/wchan
rcu_kthread
~ # INFO: task rcu_kthread:6 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
rcu_kthread D c02c6684 0 6 2 0x00000000
Backtrace:
[<c02c6388>] (schedule+0x0/0x354) from [<c00836a0>] (rcu_kthread+0x78/0xf4)
[<c0083628>] (rcu_kthread+0x0/0xf4) from [<c00633ac>] (kthread+0x88/0x90)
[<c0063324>] (kthread+0x0/0x90) from [<c004d12c>] (do_exit+0x0/0x5f8)
r7:00000013 r6:c004d12c r5:c0063324 r4:c181df28
no locks held by rcu_kthread/6.

--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of:


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