Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks

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Arjan van de Ven wrote:
On Mon, 3 Dec 2007 11:27:15 +0100
Andi Kleen <[email protected]> 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.
..

Mmm.. but the SCSI layer may do many retries, each with 30sec timeouts..
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