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Date:	Wed, 19 Dec 2012 17:52:41 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: WARNING: at block/genhd.c:1574 disk_clear_events()

Hi Sasha,

I got the below warning and it's bisected to

commit 42f8570f437b65aaf3ef176a38ad7d7fc5847d8b
Author: Sasha Levin <sasha.levin@...cle.com>
Date:   Mon Dec 17 10:01:23 2012 -0500

    workqueue: use new hashtable implementation


[   89.243805] write_dev_root_ (3265) used greatest stack depth: 2704 bytes left
[   89.666207] ------------[ cut here ]------------
[   89.667098] WARNING: at /c/kernel-tests/src/stable/block/genhd.c:1574 disk_clear_events+0xcf/0x108()
[   89.668040] Hardware name: Bochs
[   89.668040] Modules linked in:
[   89.668040] Pid: 3328, comm: ata_id Not tainted 3.7.0-01930-gbff6343 #1167
[   89.668040] Call Trace:
[   89.668040]  [<ffffffff810997c4>] warn_slowpath_common+0x83/0x9c
[   89.671922]  [<ffffffff810997f7>] warn_slowpath_null+0x1a/0x1c
[   89.671922]  [<ffffffff816aea77>] disk_clear_events+0xcf/0x108
[   89.671922]  [<ffffffff811bd8be>] check_disk_change+0x27/0x59
[   89.671922]  [<ffffffff822e48e2>] cdrom_open+0x49/0x68b
[   89.671922]  [<ffffffff82c12c07>] ? __mutex_unlock_slowpath+0x116/0x126
[   89.671922]  [<ffffffff810e9868>] ? trace_hardirqs_on_caller+0x123/0x17f
[   89.671922]  [<ffffffff82c12c0f>] ? __mutex_unlock_slowpath+0x11e/0x126
[   89.671922]  [<ffffffff81ab0291>] idecd_open+0x88/0xb7
[   89.671922]  [<ffffffff811be58f>] __blkdev_get+0x102/0x3ec
[   89.671922]  [<ffffffff811bea08>] blkdev_get+0x18f/0x30f
[   89.671922]  [<ffffffff810e92e4>] ? lock_release+0x17d/0x1cd
[   89.671922]  [<ffffffff811beb88>] ? blkdev_get+0x30f/0x30f
[   89.671922]  [<ffffffff82c14fe2>] ? _raw_spin_unlock+0x28/0x3b
[   89.671922]  [<ffffffff811beb88>] ? blkdev_get+0x30f/0x30f
[   89.671922]  [<ffffffff811bebfd>] blkdev_open+0x75/0x80
[   89.671922]  [<ffffffff8118f510>] do_dentry_open+0x1ea/0x295
[   89.671922]  [<ffffffff8118f5f0>] finish_open+0x35/0x41
[   89.671922]  [<ffffffff8119c720>] do_last+0x878/0xa25
[   89.671922]  [<ffffffff8119a308>] ? inode_permission+0x45/0x47
[   89.671922]  [<ffffffff8119c993>] path_openat+0xc6/0x333
[   89.671922]  [<ffffffff810e611a>] ? lock_release_holdtime.part.22+0x4e/0x55
[   89.671922]  [<ffffffff8119cf37>] do_filp_open+0x38/0x86
[   89.671922]  [<ffffffff811a6b4e>] ? spin_unlock+0x9/0xb
[   89.671922]  [<ffffffff811a779c>] ? __alloc_fd+0xf3/0x104
[   89.671922]  [<ffffffff81190170>] do_sys_open+0x6c/0xf9
[   89.671922]  [<ffffffff8119021e>] sys_open+0x21/0x23
[   89.671922]  [<ffffffff82c1c3d9>] system_call_fastpath+0x16/0x1b

Thanks,
Fengguang


View attachment "dmesg-kvm-fat-8578-2012-12-19-04-14-00-3.7.0-01930-gbff6343-1167" of type "text/plain" (270955 bytes)

View attachment "bff6343-bisect.log" of type "text/plain" (7158 bytes)

View attachment ".config-bisect" of type "text/plain" (126728 bytes)

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