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    Subjectkernel freeze (not even an OOPS) on remount-ro+umount when using quotas
    This is something that has biten me quite successefully
    in last few days... ;)

    To make a long story short:

    # mke2fs -j /dev/hda6
    # mount -o usrquota /dev/hda6 /mnt
    # cp -a /home /mnt # to make some files to work with
    # quotacheck -uc /mnt
    # quotaon /mnt
    # mount -o remount,ro # this is the important step!
    # ls -l /mnt /mnt/home # to do "something" (also important)
    # umount /mnt

    At this time (attempting to umount the read-only filesystem with quotas
    enabled), the machine freezes without any messages on the console. No
    OOPS, no response, no nothing - until a hard reboot (powercycle).

    This happens on 2.6.11, 2.6.12 and 2.6.13 kernels -- ie, with "current"
    kernel release.

    According to the themperature sensors on my test laptop and CPU fan
    behaviour, the kernel goes to some infinite loop at this point, because
    the fan starts rotating in a few sec after the freeze.

    This happens with both quota_v1 and quota_v2.

    Note that it isn't 100% reproduceable - sometimes it umounts
    ok, sometimes (rare) there's no need to do that pre-final
    'ls -l', and sometimes more "work" is needed around remount-ro
    to trigger the freeze.

    The filesystem is ext3.

    Any hints on the way to debug the problem?

    Thanks.

    /mjt
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