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    SubjectRe: [Bug #12612] hard lockup when interrupting cdda2wav
    On Wed, Feb 04, 2009 at 11:58:51AM +0100, Rafael J. Wysocki wrote:
    > This message has been generated automatically as a part of a report
    > of regressions introduced between 2.6.27 and 2.6.28.
    > The following bug entry is on the current list of known regressions
    > introduced between 2.6.27 and 2.6.28. Please verify if it still should
    > be listed and let me know (either way).
    > Bug-Entry :
    > Subject : hard lockup when interrupting cdda2wav
    > Submitter : Matthias Reichl <>
    > Date : 2009-01-28 16:41 (8 days old)
    > References :
    > Handled-By : FUJITA Tomonori <>

    This bug is still present in

    so long,


    [ INFO: possible recursive locking detected ] #1
    swapper/0 is trying to acquire lock:
    (&q->__queue_lock){.+..}, at: [<ffffffff8040e5f5>] blk_put_request+0x25/0x60

    but task is already holding lock:
    (&q->__queue_lock){.+..}, at: [<ffffffff8040e4da>] blk_end_io+0x5a/0xa0

    other info that might help us debug this:
    1 lock held by swapper/0:
    #0: (&q->__queue_lock){.+..}, at: [<ffffffff8040e4da>] blk_end_io+0x5a/0xa0

    stack backtrace:
    Pid: 0, comm: swapper Not tainted #1
    Call Trace:
    <IRQ> [<ffffffff8026cc87>] __lock_acquire+0x1797/0x1930
    [<ffffffff806abd7b>] error_exit+0x29/0xa9
    [<ffffffff80521e20>] sg_rq_end_io+0x0/0x2e0
    [<ffffffff8026ceba>] lock_acquire+0x9a/0xe0
    [<ffffffff8040e5f5>] blk_put_request+0x25/0x60
    [<ffffffff806ab763>] _spin_lock_irqsave+0x43/0x90
    [<ffffffff8040e5f5>] blk_put_request+0x25/0x60
    [<ffffffff8040e5f5>] blk_put_request+0x25/0x60
    [<ffffffff80520974>] sg_finish_rem_req+0xa4/0x100
    [<ffffffff80522098>] sg_rq_end_io+0x278/0x2e0
    [<ffffffff8040e281>] end_that_request_last+0x61/0x260
    [<ffffffff8040e4e8>] blk_end_io+0x68/0xa0
    [<ffffffff80508061>] scsi_end_request+0x41/0xd0
    [<ffffffff80508750>] scsi_io_completion+0x130/0x470
    [<ffffffff804133e5>] blk_done_softirq+0x75/0x90
    [<ffffffff802488ab>] __do_softirq+0x9b/0x180
    [<ffffffff80213df3>] native_sched_clock+0x13/0x70
    [<ffffffff8020d6ec>] call_softirq+0x1c/0x30
    [<ffffffff8020f175>] do_softirq+0x65/0xa0
    [<ffffffff80248345>] irq_exit+0xa5/0xb0
    [<ffffffff8020f467>] do_IRQ+0x107/0x1d0
    [<ffffffff8020c7fb>] ret_from_intr+0x0/0xf
    <EOI> [<ffffffff80214ba6>] mwait_idle+0x56/0x60
    [<ffffffff80214b9d>] mwait_idle+0x4d/0x60
    [<ffffffff8020b353>] cpu_idle+0x63/0xc0

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      Last update: 2009-02-05 14:21    [W:0.022 / U:8.288 seconds]
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