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    SubjectRe: INFO: task hung in sync_blockdev
    > > It seems multiple processes deadlocked on the bd_mutex. 
    > > Unfortunately there's no backtrace for the lock acquisitions,
    > > so it's hard to see the exact sequence.
    >
    > Well, all in the report points to a situation where some IO was submitted
    > to the block device and never completed (more exactly it took longer than
    > those 120s to complete that IO). It would need more digging into the

    Are you sure? I didn't think outstanding IO would take bd_mutex.

    -Andi

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