linux-kernel - [vfs:fsfreeze] umount BUG: sleeping function called from invalid context

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Message-ID: <20120731083839.GC14475@localhost>
Date:	Tue, 31 Jul 2012 16:38:39 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Al Viro <viro@...iv.linux.org.uk>, linux-fsdevel@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: [vfs:fsfreeze] umount BUG: sleeping function called from invalid
 context

Hi Jan,

Here is another warning for the fs freeze series.

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git fsfreeze
head:   7aff72a61f45337d83ab2b7fb16d7b542db16ad8
commit: bc875c078f72993e6c44925cdedef5a304ca7429 [37/51] fs: Improve filesystem freezing handling

The warning shows up reliably since commit bc875c0. The 2nd commit
51205f9 triggers the same warning as the previous email.

36:	b 4a55c10  GOOD
37:	B bc875c0  kvm-xgwo     [  995.982449] BUG: sleeping function called from invalid context
38:	B 51205f9  kvm-stoakley [    7.209014] [ INFO: possible circular locking dependency detected ] [mnt_want_write vfs_readdir __lock_acquire lock_acquire mutex_lock_nested do_last path_openat do_filp_open do_sys_open sys_open system_call_fastpath validate_chain __lock_acquire lock_acquire __sb_start_write mnt_want_write touch_atime vfs_readdir sys_getdents system_call_fastpath vfs_readdir print_circular_bug validate_chain __lock_acquire lock_acquire __sb_start_write mnt_want_write touch_atime vfs_readdir sys_getdents system_call_fastpath]
39:	B 5bc2ab9  kvm-stoakley [  737.432929] BUG: sleeping function called from invalid context
40:	B f7df8ce  kvm-waimea   [  178.809146] BUG: sleeping function called from invalid context
41:	B e681724  kvm-waimea   [  174.246222] BUG: sleeping function called from invalid context
42:	B 3b6be95  kvm-waimea   [  227.717663] BUG: sleeping function called from invalid context
43:	B 770324a  kvm-slim     [  978.365294] BUG: sleeping function called from invalid context
44:	B 412c18b  kvm-xgwo     [  941.146711] BUG: sleeping function called from invalid context
45:	B bc20d4d  kvm-waimea   [  158.598232] BUG: sleeping function called from invalid context
46:	B 34daaf5  kvm-waimea   [  162.483310] BUG: sleeping function called from invalid context
47:	B 1e8b839  kvm-waimea   [  197.966631] BUG: sleeping function called from invalid context
48:	B 3720c99  kvm-waimea   [  173.272378] BUG: sleeping function called from invalid context
49:	B 0a82c22  kvm-waimea   [  165.639282] BUG: sleeping function called from invalid context
50:	B 76fd41e  kvm-xgwo     [ 1236.146262] BUG: sleeping function called from invalid context
51:	B 7aff72a  kvm-slim     [ 1052.894214] BUG: sleeping function called from invalid context
51:	B 7aff72a  kvm-waimea   [  318.361556] BUG: sleeping function called from invalid context
51:	B 7aff72a  kvm-waimea   [  319.006427] BUG: sleeping function called from invalid context
51:	B 7aff72a  kvm-waimea   [  316.651432] BUG: sleeping function called from invalid context
51:	B 7aff72a  kvm-waimea   [  324.405158] BUG: sleeping function called from invalid context
51:	B 7aff72a  kvm-waimea   [  322.427800] BUG: sleeping function called from invalid context
51:	B 7aff72a  kvm-waimea   [  318.240169] BUG: sleeping function called from invalid context
51:	B 7aff72a  kvm-waimea   [  249.749861] BUG: sleeping function called from invalid context
51:	B 7aff72a  kvm-xgwo     [ 1215.732446] BUG: sleeping function called from invalid context

case-small-allocs-mt
case-truncate
[  995.982449] BUG: sleeping function called from invalid context at /c/kernel-tests/src/stable/kernel/mutex.c:269
[  995.993807] in_atomic(): 1, irqs_disabled(): 0, pid: 4795, name: umount
[  996.001491] 1 lock held by umount/4795:
[  996.006358]  #0:  (sb_lock){+.+.-.}, at: [<ffffffff8115d53b>] put_super+0x1a/0x32
[  996.013847] Pid: 4795, comm: umount Not tainted 3.5.0-rc6+ #63
[  996.017888] Call Trace:
[  996.020450]  [<ffffffff810950ed>] __might_sleep+0x107/0x10c
[  996.024074]  [<ffffffff81a1e7bd>] mutex_lock_nested+0x41/0x315
[  996.027416]  [<ffffffff81a214c4>] ? _raw_spin_unlock_irqrestore+0x47/0x65
[  996.031181]  [<ffffffff810bb0b6>] ? trace_hardirqs_on_caller+0x125/0x181
[  996.035415]  [<ffffffff8143e5c6>] percpu_counter_destroy+0x1e/0x48
[  996.039401]  [<ffffffff8115d305>] destroy_sb_writers+0x1b/0x37
[  996.043161]  [<ffffffff8115d4dc>] __put_super+0x36/0x7b
[  996.046590]  [<ffffffff8115d53b>] ? put_super+0x1a/0x32
[  996.050098]  [<ffffffff8115d543>] put_super+0x22/0x32
[  996.053322]  [<ffffffff8115d5bd>] deactivate_locked_super+0x47/0x57
[  996.056870]  [<ffffffff8115e372>] deactivate_super+0x41/0x45
[  996.060170]  [<ffffffff81175441>] mntput_no_expire+0x112/0x11b
[  996.063529]  [<ffffffff81176237>] sys_umount+0x2f4/0x30f
[  996.066975]  [<ffffffff81a287d0>] tracesys+0xdd/0xe2

Thanks,
Fengguang

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