linux-kernel - Re: softlockup: automatically detect hung TASK

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Message-Id: <20080205164626.f9c920e0.akpm@linux-foundation.org>
Date:	Tue, 5 Feb 2008 16:46:26 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: softlockup: automatically detect hung TASK_UNINTERRUPTIBLE
 tasks

On Fri, 25 Jan 2008 22:59:17 GMT
Linux Kernel Mailing List <linux-kernel@...r.kernel.org> wrote:

> Gitweb:     http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=82a1fcb90287052aabfa235e7ffc693ea003fe69
> Commit:     82a1fcb90287052aabfa235e7ffc693ea003fe69
> Parent:     d0d23b5432fe61229dd3641c5e94d4130bc4e61b
> Author:     Ingo Molnar <mingo@...e.hu>
> AuthorDate: Fri Jan 25 21:08:02 2008 +0100
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Fri Jan 25 21:08:02 2008 +0100
> 
>     softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks

One of my test boxes (an 8-way x86_64 software-development thing from Intel
- I'm not sure what's inside it) no longer powers itself off when I run `halt
-pfn'.

During bisection I found two different problems.  Sometimes the machine
wouldn't power off at all.  Other times it would power off after a pause of
around twenty seconds.

Bisection indicates that this commit is what caused the 20-second pause. 
It could be that some later commit caused the infinity-second pause.

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