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SubjectRe: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks
On Mon, 3 Dec 2007 11:27:15 +0100
Andi Kleen <andi@firstfloor.org> wrote:

> > Kernel waiting 2 minutes on TASK_UNINTERRUPTIBLE is certainly
> > broken.
>
> What should it do when the NFS server doesn't answer anymore or
> when the network to the SAN RAID array located a few hundred KM away
> develops some hickup? Or just the SCSI driver decides to do lengthy
> error recovery -- you could argue that is broken if it takes longer
> than 2 minutes, but in practice these things are hard to test
> and to fix.
>

the scsi layer will have the IO totally aborted within that time anyway;
the retry timeout for disks is 30 seconds after all.




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