Re: [Bug #12612] hard lockup when interrupting cdda2wav

Matthias Reichl
2009-02-17T17:16:01Z

The bug is still present in 2.6.28.5:

=============================================
[ INFO: possible recursive locking detected ]
2.6.28.5-dbg #1
---------------------------------------------
swapper/0 is trying to acquire lock:
(&q->__queue_lock){.+..}, at: [<ffffffff8040e615>] blk_put_request+0x25/0x60

but task is already holding lock:
(&q->__queue_lock){.+..}, at: [<ffffffff8040e4fa>] blk_end_io+0x5a/0xa0

other info that might help us debug this:
1 lock held by swapper/0:
#0: (&q->__queue_lock){.+..}, at: [<ffffffff8040e4fa>] blk_end_io+0x5a/0xa0

stack backtrace:
Pid: 0, comm: swapper Not tainted 2.6.28.5-dbg #1
Call Trace:
<IRQ> [<ffffffff8026cd07>] __lock_acquire+0x1797/0x1930
[<ffffffff806abf8b>] error_exit+0x29/0xa9
[<ffffffff80521f40>] sg_rq_end_io+0x0/0x2e0
[<ffffffff8026cf3a>] lock_acquire+0x9a/0xe0
[<ffffffff8040e615>] blk_put_request+0x25/0x60
[<ffffffff806ab973>] _spin_lock_irqsave+0x43/0x90
[<ffffffff8040e615>] blk_put_request+0x25/0x60
[<ffffffff8040e615>] blk_put_request+0x25/0x60
[<ffffffff80520a94>] sg_finish_rem_req+0xa4/0x100
[<ffffffff805221b8>] sg_rq_end_io+0x278/0x2e0
[<ffffffff8040e2a1>] end_that_request_last+0x61/0x260
[<ffffffff8040e508>] blk_end_io+0x68/0xa0
[<ffffffff80508181>] scsi_end_request+0x41/0xd0
[<ffffffff80508870>] scsi_io_completion+0x130/0x470
[<ffffffff80413405>] 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