Re: loop device deadlocks (was Re: Linux 2.3.99pre9-2 JOB list)

From: Jens Axboe (axboe@suse.de)
Date: Sat May 27 2000 - 16:51:29 EDT

  • Next message: Douglas Gilbert: "Re: LINUX Jobs for 2.4 update [scsi]"

    On Sat, May 27 2000, Steve Dodd wrote:
    > > To follow up myself: with plugging disabled, it works for me (tm);
    > > otherwise it breaks very fast.
    >
    > Some people seem to be seeing other problems though; a first glance suggests
    > it might be free request starvation / deadlock.

    Disabling plugging never cured the problem here. But with the separate
    queue request free lists patch that I posted to this list some time ago,
    all problems were gone. As Steve indicates, this also suggests request
    starvation.

    The traces I saw (this is about a month ago, so I might be a little
    off) had loop waking kflushd, which itself was deadlocked in
    get_request_wait. 

    -- 
*  Jens Axboe <axboe@suse.de>
*  Linux CD/DVD-ROM, SuSE Labs
*  http://kernel.dk

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