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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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