Re: softlockup: automatically detect hung TASK_UNINTERRUPTIBLEtasks

[Andrew Morton]

On Fri, 25 Jan 2008 22:59:17 GMT
Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx> 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@xxxxxxx>
> AuthorDate: Fri Jan 25 21:08:02 2008 +0100
> Committer:  Ingo Molnar <mingo@xxxxxxx>
> 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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