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    SubjectRe: 2.6.19-rc6 -- dm: possible recursive locking detected
    On Fri, Nov 17, 2006 at 07:43:03PM +0000, Alasdair G Kergon wrote:
    > On Fri, Nov 17, 2006 at 04:30:03PM +0100, Heiko Carstens wrote:
    > > =============================================
    > > [ INFO: possible recursive locking detected ]
    > > 2.6.19-rc6-g1b9bb3c1 #28
    > > ---------------------------------------------
    > > kpartx/945 is trying to acquire lock:
    > > (&md->io_lock){----}, at: [<00000000001f8faa>] dm_request+0x42/0x24c
    > >
    > > but task is already holding lock:
    > > (&md->io_lock){----}, at: [<00000000001f8faa>] dm_request+0x42/0x24c
    >
    > Known problem - nobody's written a patch to fix it yet to my knowledge,
    > but I don't recall any reports of real world lock-ups related to this - just
    > several reports of the debug warning messages:-)
    >
    > Simply ignore the message for now - or submit a patch that fixes the
    > underlying problem:-)

    Ignoring would be good, but this problem renders lockdep useless since it
    stops working after it found the first possible bug.

    While we are at it:

    this one is sitting since ages in -mm and probably waiting for your approval:
    http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.19-rc5/2.6.19-rc5-mm2/broken-out/md-dm-reduce-stack-usage-with-stacked-block-devices.patch
    -
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