linux-kernel - Re: NMI watchdog

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Date:	Mon, 30 Mar 2015 19:09:15 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Justin Keller <justincompsci@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: NMI watchdog

On Mon 30-03-15 08:14:45, Justin Keller wrote:
> Hello,
> Although not running a vanilla kernel on this machine, I have reported
> the issue to the distribution's bug tracking system. It has been
> almost a week with no response, so I am sending this email.
> 
> Multiple times, when I return to my computer from being away for a
> little while, I noticed:
> Message from syslogd@...acted at Mar 23 XX:XX:XX ...
> kernel:[1059322.470817] NMI watchdog: BUG: soft lockup - CPU#1 stuck
> for 22s! [kswapd0:31]

traces dumped as a part of the watchdog output is the most interesting
information. And the kernel version is very important as well.

> Dmesg | grep NMI produced:
> [1151200.727734] sending NMI to all CPUs:
> [1151200.727812] NMI backtrace for cpu 0
> [1151200.764129] INFO: NMI handler
> (arch_trigger_all_cpu_backtrace_handler) took too long to run: 36.262
> msecs
> [1151200.764198] NMI backtrace for cpu 1
> [1151216.700893] sending NMI to all CPUs:
> [1151216.700984] NMI backtrace for cpu 1
> [1151216.706524] NMI backtrace for cpu 0
> [1723994.455161] <NMI> [<ffffffff81554a5e>] ? dump_stack+0x41/0x51
> 
> I didn't have time to grep for kswapd or to investigate further. Long
> story short, the machine was shutdown shortly afterwords.
> 
> Justin
> 
> PS this was also sent to linux-watchdog. I forgot to turn of HTML, so
> I had to re-send it here
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-- 
Michal Hocko
SUSE Labs
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