linux-kernel - Re: 2.6.19-rc3-git7: scsi_device_unbusy: inconsistent lock state

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Message-ID: <45464064.2090108@rtr.ca>
Date:	Mon, 30 Oct 2006 13:11:48 -0500
From:	Mark Lord <liml@....ca>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>, mingo@...e.hu
Subject: Re: 2.6.19-rc3-git7: scsi_device_unbusy: inconsistent lock state

Mark Lord wrote:
> Jens Axboe wrote:
..
>> diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
>> index 4bae64e..da9bddf 100644
>> --- a/block/cfq-iosched.c
>> +++ b/block/cfq-iosched.c
..

It's still there.  I also see it with the SLES10 kernel 2.6.16.21-0.8.


[ INFO: inconsistent lock state ]
2.6.19-rc3-git7-ml #3
---------------------------------
inconsistent {in-softirq-W} -> {softirq-on-W} usage.
startproc/4046 [HC0[0]:SC0[0]:HE1:SE1] takes:
 (&q->__queue_lock){-+..}, at: [<c0219091>] cfq_set_request+0x351/0x3b0
{in-softirq-W} state was registered at:
  [<c01376b1>] mark_lock+0x81/0x5f0
  [<c0138a90>] __lock_acquire+0x660/0xc10
  [<c013939d>] lock_acquire+0x5d/0x80
  [<c0361c59>] _spin_lock+0x29/0x40
  [<c029fa24>] scsi_device_unbusy+0x64/0x90
  [<c029a5bc>] scsi_finish_command+0x1c/0xa0
  [<c02115c2>] blk_done_softirq+0x62/0x70
  [<c0122a27>] __do_softirq+0x87/0x100
  [<c0122af5>] do_softirq+0x55/0x60
  [<c0122f3c>] ksoftirqd+0x7c/0xd0
  [<c0130f76>] kthread+0xf6/0x100
  [<c0103c6f>] kernel_thread_helper+0x7/0x18
  [<ffffffff>] 0xffffffff
irq event stamp: 3331
hardirqs last  enabled at (3331): [<c016326d>] kmem_cache_alloc+0x6d/0xa0
hardirqs last disabled at (3330): [<c016321f>] kmem_cache_alloc+0x1f/0xa0
softirqs last  enabled at (3012): [<c0122af5>] do_softirq+0x55/0x60
softirqs last disabled at (2971): [<c0122af5>] do_softirq+0x55/0x60

other info that might help us debug this:
no locks held by startproc/4046.

stack backtrace:
 [<c0104042>] dump_trace+0x192/0x1c0
 [<c0104088>] show_trace_log_lvl+0x18/0x30
 [<c010483f>] show_trace+0xf/0x20
 [<c01049a5>] dump_stack+0x15/0x20
 [<c0137291>] print_usage_bug+0x251/0x270
 [<c0137ae7>] mark_lock+0x4b7/0x5f0
 [<c0138aae>] __lock_acquire+0x67e/0xc10
 [<c013939d>] lock_acquire+0x5d/0x80
 [<c0361c59>] _spin_lock+0x29/0x40
 [<c0219091>] cfq_set_request+0x351/0x3b0
 [<c020c7fc>] elv_set_request+0x1c/0x40
 [<c020fcff>] get_request+0x23f/0x270
 [<c0210537>] get_request_wait+0x27/0x120
 [<c02107ca>] __make_request+0x5a/0x350
 [<c020f40f>] generic_make_request+0x16f/0x220
 [<c02117e4>] submit_bio+0x64/0x110
 [<c018e969>] mpage_bio_submit+0x19/0x20
 [<c018fe85>] mpage_readpages+0x105/0x140
 [<c014d67f>] __do_page_cache_readahead+0x17f/0x260
 [<c014d7d2>] blockable_page_cache_readahead+0x72/0xd0
 [<c014da25>] page_cache_readahead+0x135/0x1e0
 [<c01474ce>] do_generic_mapping_read+0x55e/0x5a0
 [<c01496b1>] generic_file_aio_read+0x101/0x270
 [<c01669b5>] do_sync_read+0xd5/0x120
 [<c01672d1>] vfs_read+0xa1/0x160
 [<c0167851>] sys_read+0x41/0x70
 [<c0102f71>] sysenter_past_esp+0x56/0x8d
 [<b7efd410>] 0xb7efd410
 =======================
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