linux-kernel - [LKP] [sched] WARNING: CPU: 0 PID: 232 at kernel/sched/core.c:7193 __might

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Message-ID: <1419313020.26403.54.camel@intel.com>
Date:	Tue, 23 Dec 2014 13:37:00 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Michal Hocko <mhocko@...e.cz>, LKML <linux-kernel@...r.kernel.org>,
	LKP ML <lkp@...org>
Subject: [LKP] [sched] WARNING: CPU: 0 PID: 232 at kernel/sched/core.c:7193
 __might_sleep+0x6f/0xa9()

FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git since-3.18
commit 407bf4d3b56d3d36920a401cd88691f3f6c093cc ("sched: Debug nested sleeps")

I think this is expected behavior, some migh_sleep warning show in dmesg.

+------------------------------------------------------------------+------------+------------+
|                                                                  | 6866a948ce | 407bf4d3b5 |
+------------------------------------------------------------------+------------+------------+
| boot_successes                                                   | 9          | 0          |
| boot_failures                                                    | 9          | 30         |
| Out_of_memory:Kill_process                                       | 9          |            |
| backtrace:do_mount                                               | 2          |            |
| backtrace:compat_SyS_mount                                       | 2          |            |
| Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 2          |            |
| backtrace:vfs_read                                               | 2          |            |
| backtrace:SyS_read                                               | 2          |            |
| backtrace:do_sys_open                                            | 1          |            |
| backtrace:compat_SyS_open                                        | 1          |            |
| backtrace:do_fork                                                | 4          |            |
| backtrace:SyS_clone                                              | 4          |            |
| WARNING:at_drivers/block/floppy.c:#schedule_bh()                 | 1          |            |
| backtrace:do_execve_common                                       | 3          |            |
| backtrace:compat_SyS_execve                                      | 3          |            |
| WARNING:at_kernel/sched/core.c:#__might_sleep()                  | 0          | 30         |
| backtrace:rfcomm_run                                             | 0          | 29         |
+------------------------------------------------------------------+------------+------------+


[   32.821749] Bluetooth: RFCOMM TTY layer initialized
[   32.823450] Bluetooth: RFCOMM socket layer initialized
[   32.825557] ------------[ cut here ]------------
[   32.826714] WARNING: CPU: 0 PID: 232 at kernel/sched/core.c:7193 __might_sleep+0x6f/0xa9()
[   32.829296] do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffff82bebfe5>] rfcomm_run+0x122/0x1005
[   32.831873] Modules linked in:
[   32.832928] CPU: 0 PID: 232 Comm: krfcommd Not tainted 3.18.0 #1922
[   32.834668] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   32.835998]  0000000000000009 ffff88000b26bc58 ffffffff82d5df90 00000000001cf5b0
[   32.838613]  ffff88000b26bca8 ffff88000b26bc98 ffffffff810c7209 ffffea00002702b8
[   32.840983]  ffffffff810e65d1 ffffffff8386bf13 000000000000026d 0000000000000000
[   32.843919] Call Trace:
[   32.844787]  [<ffffffff82d5df90>] dump_stack+0x4e/0x68
[   32.846210]  [<ffffffff810c7209>] warn_slowpath_common+0xa2/0xbc
[   32.847591]  [<ffffffff810e65d1>] ? __might_sleep+0x6f/0xa9
[   32.849319]  [<ffffffff810c7269>] warn_slowpath_fmt+0x46/0x48
[   32.850673]  [<ffffffff82beb264>] ? rfcomm_session_add+0x2b/0xdd
[   32.852680]  [<ffffffff82bebfe5>] ? rfcomm_run+0x122/0x1005
[   32.854011]  [<ffffffff82bebfe5>] ? rfcomm_run+0x122/0x1005
[   32.855356]  [<ffffffff810e65d1>] __might_sleep+0x6f/0xa9
[   32.856845]  [<ffffffff82bebec3>] ? rfcomm_check_accept+0x8b/0x8b
[   32.858291]  [<ffffffff82d7f713>] mutex_lock_nested+0x2f/0x3e4
[   32.859663]  [<ffffffff8111e4b7>] ? init_timer_key+0x97/0xd2
[   32.861321]  [<ffffffff82bebec3>] ? rfcomm_check_accept+0x8b/0x8b
[   32.862735]  [<ffffffff82bec02a>] rfcomm_run+0x167/0x1005
[   32.864414]  [<ffffffff82d7db35>] ? __schedule+0x3f5/0x5e4
[   32.865881]  [<ffffffff82bebec3>] ? rfcomm_check_accept+0x8b/0x8b
[   32.867790]  [<ffffffff810e030e>] kthread+0xe0/0xe8
[   32.869022]  [<ffffffff82d81f3e>] ? _raw_spin_unlock_irq+0x2d/0x3e
[   32.870951]  [<ffffffff810e022e>] ? __kthread_parkme+0xad/0xad
[   32.872632]  [<ffffffff82d8297c>] ret_from_fork+0x7c/0xb0
[   32.873934]  [<ffffffff810e022e>] ? __kthread_parkme+0xad/0xad
[   32.875531] ---[ end trace a2de474b76db3d65 ]---
[   32.876812] Bluetooth: RFCOMM ver 1.11



Thanks,
Fengguang


View attachment "config-3.18.0-00114-g407bf4d" of type "text/plain" (139420 bytes)

View attachment ".dmesg" of type "text/plain" (45851 bytes)

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