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    SubjectRe: 2.4.20-rc1 - hang with processes stuck in D
    On Tue, Nov 05, 2002 at 10:08:30PM -0500, Jeff Dike wrote:
    > akpm@digeo.com said:
    > > Kernel is waiting for IO completion on a read. I would be suspecting
    > > your IO system, or interrupt system.
    >
    > Yup. The disk access light is stuck on continuously at this point, FWIW.
    >
    >
    > > Reverting your ide/scsi/whatever drivers to the last-known-to-work
    > > version would be interesting.
    >
    > IDE - this didn't happen on 2.4.18. It seems to happen on all more recent
    > kernels. UML seems to trigger it, especially on UML servers.

    Maybe not related, but I see 5 second "pauses" on a RAID-0+1 (software
    RAID, Seagate 80G disks, Promise Ultra66+Ultra133 controllers, dual x86)
    file server here.

    I suspected NFS problems (looks like someone re-wrote NFS between 2.4.18
    and 2.4.20-rc1) - but this is *not* the case. The pauses happen on
    locally running processes as well.

    It seems to correlate well with a remote host delivering a mail (using
    maildir over NFS) - but this is not the only situation in which it
    happens.

    Everything using disk, both on NFS clients and locally running
    processes, just pause. Five seconds after everything is like it never
    happened.

    Nothing in dmesg.

    Didn't happen in 2.4.18, happens in 2.4.20-rc1.

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