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    SubjectRe: xfs_io "BUG: lock held when returning to user space!" on suspend
    On Wed, Apr 02, 2008 at 11:58:54AM -0700, Jeremy Fitzhardinge wrote:
    > I'm getting this:
    > ================================================
    > [ BUG: lock held when returning to user space! ]
    > ------------------------------------------------
    > xfs_io/18796 is leaving the kernel with locks still held!
    > 1 lock held by xfs_io/18796:
    > #0: (&type->s_umount_key#19){----}, at: [<c048c9ac>] get_super+0x42/0x87
    > when I suspend, possibly during an xfs-freeze. There don't seem to be any
    > ill-effects.

    Yup, both the sb->s_umount and bdev->bd_mount_sem seaphores are held
    across freeze_bdev()/thaw_bdev(), and they are issued via separate
    ioctls generally from separate processes. Not great design, but not
    a bug....


    Dave Chinner
    Principal Engineer
    SGI Australian Software Group

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