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Date: Wed, 09 Jan 2013 03:17:41 +0000 (GMT)
From: ÇãÁ¾¸¸ <jongman.heo@...sung.com>
To: Jeff Layton <jlayton@...hat.com>,
Suresh Jayaraman <sjayaraman@...e.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
linux-cifs <linux-cifs@...r.kernel.org>
Subject: Re: Re: [3.8-rc2] stuck at reading CIFS mounted directory
Hi,
> ------- Original Message -------
> Sender : Jeff Layton<jlayton@...hat.com>
> Date : 2013-01-08 00:13 (GMT+09:00)
> Title : Re: [3.8-rc2] stuck at reading CIFS mounted directory
>
> On Mon, 07 Jan 2013 15:10:05 +0530
> Suresh Jayaraman wrote:
>
> > (Cc linux-cifs@...r.kernel.org)
> >
> > On 01/04/2013 06:27 AM, Jongman Heo wrote:
> > > Hi, all,
> > >
> > > In 3.8-rc2, access to CIFS-mounted directory (df, ls, or similar) got stuck with following message.
> > >
> > > It's mounted with...
> > > mount -t cifs ///Share /mnt/window -o user=jongman.heo,password=xxxx,sec=ntlm
> > >
> > >
> > > [16655.288591] INFO: task bash:4042 blocked for more than 120 seconds.
> > > [16655.318117] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> > > [16655.318123] bash D dada9c5c 0 4042 1 0x00000004
> > > [16655.318132] dada9cd0 00000082 00000282 dada9c5c c09022c6 dada9c7c c044d316 c0c7c300
> > > [16655.318139] d6db3a7b 00000f09 c0c7c300 00000000 00000f09 f3b7b240 c04401ba 00000000
> > > [16655.318145] c0b9e0d8 f598e960 00000000 00000303 dada9c98 dada9c98 f598e960 00000006
> > > [16655.318150] Call Trace:
> > > [16655.342785] [] ? _raw_spin_unlock_irqrestore+0xf/0x11
> > > [16655.351554] [] ? __wake_up+0x3b/0x42
> > > [16655.358802] [] ? call_usermodehelper_fns+0x148/0x152
> > > [16655.358840] [] ? __request_module+0x15e/0x1a1
> > > [16655.358842] [] ? call_usermodehelper_freeinfo+0x19/0x19
> > > [16655.358845] [] schedule+0x51/0x53
> > > [16655.358847] [] schedule_preempt_disabled+0x8/0xa
> > > [16655.384345] [] __mutex_lock_common+0xd6/0x123
> > > [16655.384430] [] __mutex_lock_slowpath+0x20/0x22
> > > [16655.384436] [] ? mutex_lock+0x18/0x25
> > > [16655.384441] [] mutex_lock+0x18/0x25
> > > [16655.384892] [] cifs_reconnect_tcon+0x170/0x252
> > > [16655.384953] [] ? should_resched+0x8/0x22
> > > [16655.384963] [] ? _cond_resched+0x8/0x1c
> > > [16655.384969] [] smb_init+0x1d/0x6d
> > > [16655.385023] [] CIFSSMBQPathInfo+0x4e/0x1e4
> > > [16655.385071] [] cifs_query_path_info+0x38/0x73
> > > [16655.385080] [] cifs_get_inode_info+0x122/0x3ac
> > > [16655.385548] [] ? walk_component+0x14a/0x17a
> > > [16655.385570] [] ? build_path_from_dentry+0xa3/0x19e
> > > [16655.385585] [] ? build_path_from_dentry+0xa3/0x19e
> > > [16655.385596] [] ? build_path_from_dentry+0xa3/0x19e
> > > [16655.385601] [] ? getname_flags+0x59/0xeb
> > > [16655.385606] [] ? _raw_spin_lock+0x8/0xa
> > > [16655.385613] [] cifs_revalidate_dentry_attr+0x120/0x168
> > > [16655.385618] [] cifs_getattr+0x5e/0xe3
> > > [16655.385625] [] vfs_getattr+0x37/0x4e
> > > [16655.385631] [] ? cifs_revalidate_dentry+0x20/0x20
> > > [16655.385639] [] vfs_fstatat+0x59/0x8a
> > > [16655.385645] [] vfs_stat+0x19/0x1b
> > > [16655.385652] [] sys_stat64+0x11/0x22
> > > [16655.385659] [] ? should_resched+0x8/0x22
> > > [16655.385668] [] ? _cond_resched+0x8/0x1c
> > > [16655.385674] [] ? task_work_run+0x6d/0x79
> > > [16655.385825] [] ? __do_page_fault+0x33b/0x33b
> > > [16655.385834] [] ? do_page_fault+0x8/0xa
> > > [16655.385840] [] sysenter_do_call+0x12/0x2c
> > >
> > > N?????r??y???b?X???v?^?)?{.n?+????{????zX??.???}????z?&j:+v???.????zZ+??+zf???h???~????i???z?.?w????????&?)?.f??^j?y?m??@...??? 0??h?.?i
> > >
> >
> >
>
> Looks like it's waiting on the session_mutex to become free. The
> question is what's holding it and why. Some questions:
>
> 1) is this a regression? If so, what version were you using previously?
Yeah, regression. IIRC I didn't have this issue with 3.7.
> 2) any other processes stuck on on this mutex? What about the cifsd
> thread for this mount? Is it stuck holding it? You may want to
> "cat /proc//stack" on any other threads that might be related here
> and see if you can figure out what they're doing.
After the hang happens, CIFS is working well. Stack of cifsd doesn't show any interesting thing.
[ORANGE@...t/window] ps ax | grep cifsd
1135 ? S 1:13 [cifsd]
[ORANGE@...t/window] cat /proc/1135/stack
[<c0833b8b>] sk_wait_data+0x63/0x9b
[<c0872e20>] tcp_recvmsg+0x3aa/0x780
[<c088cf40>] inet_recvmsg+0x51/0x63
[<c0830628>] sock_recvmsg+0x80/0x9d
[<c0830674>] kernel_recvmsg+0x2f/0x3f
[<c05ea2e9>] cifs_readv_from_socket+0x142/0x1d3
[<c05ea396>] cifs_read_from_socket+0x1c/0x1e
[<c05eaad2>] cifs_demultiplex_thread+0x701/0x72b
[<c0445ca4>] kthread+0x6b/0x70
[<c09078b7>] ret_from_kernel_thread+0x1b/0x28
[<ffffffff>] 0xffffffff
Host : Windows 7
Guest : VMWare Fedora 16 + 3.8 custom kernel
I feel that the issue is more likely to happen in this case.
mount cifs directory from VMWare guest -> go to S3 sleep mode (by closing lid of laptop) -> open lid -> check cifs directory of VMWare
Following is more call stack trace I hit today.
[23245.542488] INFO: task bash:2711 blocked for more than 120 seconds.
[23245.571664] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[23245.571672] bash D f3bd5c5c 0 2711 2689 0x00000000
[23245.580899] f3bd5cd0 00000086 00000282 f3bd5c5c c0902306 f3bd5c7c c044d2be c0c7c300
[23245.580910] b538a613 000014fd c0c7c300 00000000 000014fd f3bf0c90 c0440162 00000000
[23245.580919] c0b9e0d8 f3b8ab60 00000000 00000303 f3bd5c98 f3bd5c98 f3b8ab60 00000006
[23245.580928] Call Trace:
[23245.603320] [<c0902306>] ? _raw_spin_unlock_irqrestore+0xf/0x11
[23245.609972] [<c044d2be>] ? __wake_up+0x3b/0x42
[23245.610114] [<c0440162>] ? call_usermodehelper_fns+0x148/0x152
[23245.610389] [<c0440410>] ? __request_module+0x15e/0x1a1
[23245.610397] [<c043fde5>] ? call_usermodehelper_freeinfo+0x19/0x19
[23245.610404] [<c0901ada>] schedule+0x51/0x53
[23245.610409] [<c0901c2d>] schedule_preempt_disabled+0x8/0xa
[23245.610894] [<c0900e26>] __mutex_lock_common+0xd6/0x123
[23245.610914] [<c0900f79>] __mutex_lock_slowpath+0x20/0x22
[23245.610920] [<c0900f1f>] ? mutex_lock+0x18/0x25
[23245.610925] [<c0900f1f>] mutex_lock+0x18/0x25
[23245.611495] [<c05e1580>] cifs_reconnect_tcon+0x170/0x252
[23245.611506] [<c0450644>] ? resched_task+0x5e/0x61
[23245.620010] [<c05e167f>] smb_init+0x1d/0x6d
[23245.620183] [<c05e4eaf>] CIFSSMBQPathInfo+0x4e/0x1e4
[23245.620248] [<c05fdfbc>] cifs_query_path_info+0x38/0x73
[23245.620265] [<c05f455a>] cifs_get_inode_info+0x122/0x3ac
[23245.620721] [<c04e1e87>] ? walk_component+0x14a/0x17a
[23245.620736] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23245.620742] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23245.620748] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23245.620754] [<c04e215c>] ? getname_flags+0x1/0xeb
[23245.620759] [<c09022ba>] ? _raw_spin_lock+0x8/0xa
[23245.620766] [<c05f5bd4>] cifs_revalidate_dentry_attr+0x120/0x168
[23245.620772] [<c05f5cbd>] cifs_getattr+0x5e/0xe3
[23245.620779] [<c04dda16>] ? cp_new_stat64+0xef/0x101
[23245.620785] [<c04dddde>] vfs_getattr+0x37/0x4e
[23245.620790] [<c05f5c5f>] ? cifs_revalidate_dentry+0x20/0x20
[23245.620796] [<c04dde4e>] vfs_fstatat+0x59/0x8a
[23245.620816] [<c04ddeb3>] vfs_stat+0x19/0x1b
[23245.620828] [<c04de0b8>] sys_stat64+0x11/0x22
[23245.620887] [<c0907951>] sysenter_do_call+0x12/0x2c
[23365.425634] INFO: task bash:2711 blocked for more than 120 seconds.
[23365.425642] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[23365.425645] bash D f3bd5c5c 0 2711 2689 0x00000000
[23365.425653] f3bd5cd0 00000086 00000282 f3bd5c5c c0902306 f3bd5c7c c044d2be c0c7c300
[23365.425663] b538a613 000014fd c0c7c300 00000000 000014fd f3bf0c90 c0440162 00000000
[23365.425672] c0b9e0d8 f3b8ab60 00000000 00000303 f3bd5c98 f3bd5c98 f3b8ab60 00000006
[23365.425681] Call Trace:
[23365.425696] [<c0902306>] ? _raw_spin_unlock_irqrestore+0xf/0x11
[23365.425704] [<c044d2be>] ? __wake_up+0x3b/0x42
[23365.425711] [<c0440162>] ? call_usermodehelper_fns+0x148/0x152
[23365.425717] [<c0440410>] ? __request_module+0x15e/0x1a1
[23365.425723] [<c043fde5>] ? call_usermodehelper_freeinfo+0x19/0x19
[23365.425728] [<c0901ada>] schedule+0x51/0x53
[23365.425732] [<c0901c2d>] schedule_preempt_disabled+0x8/0xa
[23365.425740] [<c0900e26>] __mutex_lock_common+0xd6/0x123
[23365.425746] [<c0900f79>] __mutex_lock_slowpath+0x20/0x22
[23365.425751] [<c0900f1f>] ? mutex_lock+0x18/0x25
[23365.425757] [<c0900f1f>] mutex_lock+0x18/0x25
[23365.425765] [<c05e1580>] cifs_reconnect_tcon+0x170/0x252
[23365.425771] [<c0450644>] ? resched_task+0x5e/0x61
[23365.425777] [<c05e167f>] smb_init+0x1d/0x6d
[23365.425782] [<c05e4eaf>] CIFSSMBQPathInfo+0x4e/0x1e4
[23365.425790] [<c05fdfbc>] cifs_query_path_info+0x38/0x73
[23365.425796] [<c05f455a>] cifs_get_inode_info+0x122/0x3ac
[23365.425804] [<c04e1e87>] ? walk_component+0x14a/0x17a
[23365.425809] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23365.425814] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23365.425819] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23365.425824] [<c04e215c>] ? getname_flags+0x1/0xeb
[23365.425829] [<c09022ba>] ? _raw_spin_lock+0x8/0xa
[23365.425835] [<c05f5bd4>] cifs_revalidate_dentry_attr+0x120/0x168
[23365.425841] [<c05f5cbd>] cifs_getattr+0x5e/0xe3
[23365.425847] [<c04dda16>] ? cp_new_stat64+0xef/0x101
[23365.425852] [<c04dddde>] vfs_getattr+0x37/0x4e
[23365.425857] [<c05f5c5f>] ? cifs_revalidate_dentry+0x20/0x20
[23365.425863] [<c04dde4e>] vfs_fstatat+0x59/0x8a
[23365.425868] [<c04ddeb3>] vfs_stat+0x19/0x1b
[23365.425873] [<c04de0b8>] sys_stat64+0x11/0x22
[23365.425880] [<c0907951>] sysenter_do_call+0x12/0x2c
[23485.230971] INFO: task bash:2711 blocked for more than 120 seconds.
[23485.230979] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[23485.230982] bash D f3bd5c5c 0 2711 2689 0x00000000
[23485.230990] f3bd5cd0 00000086 00000282 f3bd5c5c c0902306 f3bd5c7c c044d2be c0c7c300
[23485.231001] b538a613 000014fd c0c7c300 00000000 000014fd f3bf0c90 c0440162 00000000
[23485.231009] c0b9e0d8 f3b8ab60 00000000 00000303 f3bd5c98 f3bd5c98 f3b8ab60 00000006
[23485.231019] Call Trace:
[23485.231117] [<c0902306>] ? _raw_spin_unlock_irqrestore+0xf/0x11
[23485.231128] [<c044d2be>] ? __wake_up+0x3b/0x42
[23485.231136] [<c0440162>] ? call_usermodehelper_fns+0x148/0x152
[23485.231142] [<c0440410>] ? __request_module+0x15e/0x1a1
[23485.231148] [<c043fde5>] ? call_usermodehelper_freeinfo+0x19/0x19
[23485.231153] [<c0901ada>] schedule+0x51/0x53
[23485.231158] [<c0901c2d>] schedule_preempt_disabled+0x8/0xa
[23485.231166] [<c0900e26>] __mutex_lock_common+0xd6/0x123
[23485.231172] [<c0900f79>] __mutex_lock_slowpath+0x20/0x22
[23485.231177] [<c0900f1f>] ? mutex_lock+0x18/0x25
[23485.231183] [<c0900f1f>] mutex_lock+0x18/0x25
[23485.231192] [<c05e1580>] cifs_reconnect_tcon+0x170/0x252
[23485.231198] [<c0450644>] ? resched_task+0x5e/0x61
[23485.231204] [<c05e167f>] smb_init+0x1d/0x6d
[23485.231209] [<c05e4eaf>] CIFSSMBQPathInfo+0x4e/0x1e4
[23485.231217] [<c05fdfbc>] cifs_query_path_info+0x38/0x73
[23485.231223] [<c05f455a>] cifs_get_inode_info+0x122/0x3ac
[23485.231231] [<c04e1e87>] ? walk_component+0x14a/0x17a
[23485.231236] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23485.231242] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23485.231247] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23485.231252] [<c04e215c>] ? getname_flags+0x1/0xeb
[23485.231257] [<c09022ba>] ? _raw_spin_lock+0x8/0xa
[23485.231263] [<c05f5bd4>] cifs_revalidate_dentry_attr+0x120/0x168
[23485.231269] [<c05f5cbd>] cifs_getattr+0x5e/0xe3
[23485.231275] [<c04dda16>] ? cp_new_stat64+0xef/0x101
[23485.231280] [<c04dddde>] vfs_getattr+0x37/0x4e
[23485.231286] [<c05f5c5f>] ? cifs_revalidate_dentry+0x20/0x20
[23485.231291] [<c04dde4e>] vfs_fstatat+0x59/0x8a
[23485.231297] [<c04ddeb3>] vfs_stat+0x19/0x1b
[23485.231302] [<c04de0b8>] sys_stat64+0x11/0x22
[23485.231308] [<c0907951>] sysenter_do_call+0x12/0x2c
[23605.036526] INFO: task bash:2711 blocked for more than 120 seconds.
[23605.036533] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[23605.036537] bash D f3bd5c5c 0 2711 2689 0x00000000
[23605.036545] f3bd5cd0 00000086 00000282 f3bd5c5c c0902306 f3bd5c7c c044d2be c0c7c300
[23605.036555] b538a613 000014fd c0c7c300 00000000 000014fd f3bf0c90 c0440162 00000000
[23605.036564] c0b9e0d8 f3b8ab60 00000000 00000303 f3bd5c98 f3bd5c98 f3b8ab60 00000006
[23605.036574] Call Trace:
[23605.036588] [<c0902306>] ? _raw_spin_unlock_irqrestore+0xf/0x11
[23605.036596] [<c044d2be>] ? __wake_up+0x3b/0x42
[23605.036604] [<c0440162>] ? call_usermodehelper_fns+0x148/0x152
[23605.036609] [<c0440410>] ? __request_module+0x15e/0x1a1
[23605.036615] [<c043fde5>] ? call_usermodehelper_freeinfo+0x19/0x19
[23605.036620] [<c0901ada>] schedule+0x51/0x53
[23605.036624] [<c0901c2d>] schedule_preempt_disabled+0x8/0xa
[23605.036632] [<c0900e26>] __mutex_lock_common+0xd6/0x123
[23605.036638] [<c0900f79>] __mutex_lock_slowpath+0x20/0x22
[23605.036644] [<c0900f1f>] ? mutex_lock+0x18/0x25
[23605.036649] [<c0900f1f>] mutex_lock+0x18/0x25
[23605.036657] [<c05e1580>] cifs_reconnect_tcon+0x170/0x252
[23605.036664] [<c0450644>] ? resched_task+0x5e/0x61
[23605.036669] [<c05e167f>] smb_init+0x1d/0x6d
[23605.036675] [<c05e4eaf>] CIFSSMBQPathInfo+0x4e/0x1e4
[23605.036682] [<c05fdfbc>] cifs_query_path_info+0x38/0x73
[23605.036689] [<c05f455a>] cifs_get_inode_info+0x122/0x3ac
[23605.036696] [<c04e1e87>] ? walk_component+0x14a/0x17a
[23605.036702] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23605.036707] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23605.036712] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23605.036717] [<c04e215c>] ? getname_flags+0x1/0xeb
[23605.036721] [<c09022ba>] ? _raw_spin_lock+0x8/0xa
[23605.036728] [<c05f5bd4>] cifs_revalidate_dentry_attr+0x120/0x168
[23605.036733] [<c05f5cbd>] cifs_getattr+0x5e/0xe3
[23605.036740] [<c04dda16>] ? cp_new_stat64+0xef/0x101
[23605.036745] [<c04dddde>] vfs_getattr+0x37/0x4e
[23605.036750] [<c05f5c5f>] ? cifs_revalidate_dentry+0x20/0x20
[23605.036946] [<c04dde4e>] vfs_fstatat+0x59/0x8a
[23605.037061] [<c04ddeb3>] vfs_stat+0x19/0x1b
[23605.037067] [<c04de0b8>] sys_stat64+0x11/0x22
[23605.037074] [<c0907951>] sysenter_do_call+0x12/0x2c
[23724.844814] INFO: task bash:2711 blocked for more than 120 seconds.
[23724.844826] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[23724.844830] bash D f3bd5c5c 0 2711 2689 0x00000000
[23724.844838] f3bd5cd0 00000086 00000282 f3bd5c5c c0902306 f3bd5c7c c044d2be c0c7c300
[23724.844849] b538a613 000014fd c0c7c300 00000000 000014fd f3bf0c90 c0440162 00000000
[23724.844857] c0b9e0d8 f3b8ab60 00000000 00000303 f3bd5c98 f3bd5c98 f3b8ab60 00000006
[23724.844866] Call Trace:
[23724.844881] [<c0902306>] ? _raw_spin_unlock_irqrestore+0xf/0x11
[23724.844889] [<c044d2be>] ? __wake_up+0x3b/0x42
[23724.844897] [<c0440162>] ? call_usermodehelper_fns+0x148/0x152
[23724.844903] [<c0440410>] ? __request_module+0x15e/0x1a1
[23724.844908] [<c043fde5>] ? call_usermodehelper_freeinfo+0x19/0x19
[23724.844913] [<c0901ada>] schedule+0x51/0x53
[23724.844918] [<c0901c2d>] schedule_preempt_disabled+0x8/0xa
[23724.844926] [<c0900e26>] __mutex_lock_common+0xd6/0x123
[23724.844932] [<c0900f79>] __mutex_lock_slowpath+0x20/0x22
[23724.844937] [<c0900f1f>] ? mutex_lock+0x18/0x25
[23724.844942] [<c0900f1f>] mutex_lock+0x18/0x25
[23724.844951] [<c05e1580>] cifs_reconnect_tcon+0x170/0x252
[23724.844957] [<c0450644>] ? resched_task+0x5e/0x61
[23724.844963] [<c05e167f>] smb_init+0x1d/0x6d
[23724.844968] [<c05e4eaf>] CIFSSMBQPathInfo+0x4e/0x1e4
[23724.844976] [<c05fdfbc>] cifs_query_path_info+0x38/0x73
[23724.844982] [<c05f455a>] cifs_get_inode_info+0x122/0x3ac
[23724.844990] [<c04e1e87>] ? walk_component+0x14a/0x17a
[23724.844995] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23724.845000] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23724.845005] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23724.845010] [<c04e215c>] ? getname_flags+0x1/0xeb
[23724.845015] [<c09022ba>] ? _raw_spin_lock+0x8/0xa
[23724.845021] [<c05f5bd4>] cifs_revalidate_dentry_attr+0x120/0x168
[23724.845027] [<c05f5cbd>] cifs_getattr+0x5e/0xe3
[23724.845033] [<c04dda16>] ? cp_new_stat64+0xef/0x101
[23724.845038] [<c04dddde>] vfs_getattr+0x37/0x4e
[23724.845043] [<c05f5c5f>] ? cifs_revalidate_dentry+0x20/0x20
[23724.845048] [<c04dde4e>] vfs_fstatat+0x59/0x8a
[23724.845054] [<c04ddeb3>] vfs_stat+0x19/0x1b
[23724.845059] [<c04de0b8>] sys_stat64+0x11/0x22
[23724.845066] [<c0907951>] sysenter_do_call+0x12/0x2c
[23844.651044] INFO: task bash:2711 blocked for more than 120 seconds.
[23844.651052] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[23844.651056] bash D f3bd5c5c 0 2711 2689 0x00000000
[23844.651063] f3bd5cd0 00000086 00000282 f3bd5c5c c0902306 f3bd5c7c c044d2be c0c7c300
[23844.651074] b538a613 000014fd c0c7c300 00000000 000014fd f3bf0c90 c0440162 00000000
[23844.651082] c0b9e0d8 f3b8ab60 00000000 00000303 f3bd5c98 f3bd5c98 f3b8ab60 00000006
[23844.651092] Call Trace:
[23844.651106] [<c0902306>] ? _raw_spin_unlock_irqrestore+0xf/0x11
[23844.651113] [<c044d2be>] ? __wake_up+0x3b/0x42
[23844.651121] [<c0440162>] ? call_usermodehelper_fns+0x148/0x152
[23844.651127] [<c0440410>] ? __request_module+0x15e/0x1a1
[23844.651133] [<c043fde5>] ? call_usermodehelper_freeinfo+0x19/0x19
[23844.651138] [<c0901ada>] schedule+0x51/0x53
[23844.651142] [<c0901c2d>] schedule_preempt_disabled+0x8/0xa
[23844.651150] [<c0900e26>] __mutex_lock_common+0xd6/0x123
[23844.651156] [<c0900f79>] __mutex_lock_slowpath+0x20/0x22
[23844.651162] [<c0900f1f>] ? mutex_lock+0x18/0x25
[23844.651167] [<c0900f1f>] mutex_lock+0x18/0x25
[23844.651176] [<c05e1580>] cifs_reconnect_tcon+0x170/0x252
[23844.651182] [<c0450644>] ? resched_task+0x5e/0x61
[23844.651188] [<c05e167f>] smb_init+0x1d/0x6d
[23844.651193] [<c05e4eaf>] CIFSSMBQPathInfo+0x4e/0x1e4
[23844.651201] [<c05fdfbc>] cifs_query_path_info+0x38/0x73
[23844.651207] [<c05f455a>] cifs_get_inode_info+0x122/0x3ac
[23844.651215] [<c04e1e87>] ? walk_component+0x14a/0x17a
[23844.651220] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23844.651225] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23844.651230] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23844.651235] [<c04e215c>] ? getname_flags+0x1/0xeb
[23844.651240] [<c09022ba>] ? _raw_spin_lock+0x8/0xa
[23844.651246] [<c05f5bd4>] cifs_revalidate_dentry_attr+0x120/0x168
[23844.651252] [<c05f5cbd>] cifs_getattr+0x5e/0xe3
[23844.651258] [<c04dda16>] ? cp_new_stat64+0xef/0x101
[23844.651263] [<c04dddde>] vfs_getattr+0x37/0x4e
[23844.651269] [<c05f5c5f>] ? cifs_revalidate_dentry+0x20/0x20
[23844.651274] [<c04dde4e>] vfs_fstatat+0x59/0x8a
[23844.651280] [<c04ddeb3>] vfs_stat+0x19/0x1b
[23844.651285] [<c04de0b8>] sys_stat64+0x11/0x22
[23844.651292] [<c0907951>] sysenter_do_call+0x12/0x2c
[23964.456484] INFO: task bash:2711 blocked for more than 120 seconds.
[23964.456492] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[23964.456496] bash D f3bd5c5c 0 2711 2689 0x00000000
[23964.456503] f3bd5cd0 00000086 00000282 f3bd5c5c c0902306 f3bd5c7c c044d2be c0c7c300
[23964.456514] b538a613 000014fd c0c7c300 00000000 000014fd f3bf0c90 c0440162 00000000
[23964.456523] c0b9e0d8 f3b8ab60 00000000 00000303 f3bd5c98 f3bd5c98 f3b8ab60 00000006
[23964.456532] Call Trace:
[23964.456547] [<c0902306>] ? _raw_spin_unlock_irqrestore+0xf/0x11
[23964.456559] [<c044d2be>] ? __wake_up+0x3b/0x42
[23964.456568] [<c0440162>] ? call_usermodehelper_fns+0x148/0x152
[23964.456573] [<c0440410>] ? __request_module+0x15e/0x1a1
[23964.456579] [<c043fde5>] ? call_usermodehelper_freeinfo+0x19/0x19
[23964.456584] [<c0901ada>] schedule+0x51/0x53
[23964.456589] [<c0901c2d>] schedule_preempt_disabled+0x8/0xa
[23964.456597] [<c0900e26>] __mutex_lock_common+0xd6/0x123
[23964.456603] [<c0900f79>] __mutex_lock_slowpath+0x20/0x22
[23964.456608] [<c0900f1f>] ? mutex_lock+0x18/0x25
[23964.456614] [<c0900f1f>] mutex_lock+0x18/0x25
[23964.456622] [<c05e1580>] cifs_reconnect_tcon+0x170/0x252
[23964.456629] [<c0450644>] ? resched_task+0x5e/0x61
[23964.456635] [<c05e167f>] smb_init+0x1d/0x6d
[23964.456640] [<c05e4eaf>] CIFSSMBQPathInfo+0x4e/0x1e4
[23964.456648] [<c05fdfbc>] cifs_query_path_info+0x38/0x73
[23964.456654] [<c05f455a>] cifs_get_inode_info+0x122/0x3ac
[23964.456662] [<c04e1e87>] ? walk_component+0x14a/0x17a
[23964.456667] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23964.456672] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23964.456678] [<c05ece9e>] ? build_path_from_dentry+0xa3/0x19e
[23964.456683] [<c04e215c>] ? getname_flags+0x1/0xeb
[23964.456687] [<c09022ba>] ? _raw_spin_lock+0x8/0xa
[23964.456693] [<c05f5bd4>] cifs_revalidate_dentry_attr+0x120/0x168
[23964.456699] [<c05f5cbd>] cifs_getattr+0x5e/0xe3
[23964.456705] [<c04dda16>] ? cp_new_stat64+0xef/0x101
[23964.456711] [<c04dddde>] vfs_getattr+0x37/0x4e
[23964.456716] [<c05f5c5f>] ? cifs_revalidate_dentry+0x20/0x20
[23964.456721] [<c04dde4e>] vfs_fstatat+0x59/0x8a
[23964.456727] [<c04ddeb3>] vfs_stat+0x19/0x1b
[23964.456732] [<c04de0b8>] sys_stat64+0x11/0x22
[23964.456739] [<c0907951>] sysenter_do_call+0x12/0x2c
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