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Message-ID: <1436938290.14273.54.camel@intel.com>
Date: Wed, 15 Jul 2015 13:31:30 +0800
From: Huang Ying <ying.huang@...el.com>
To: Dean Jenkins <Dean_Jenkins@...tor.com>
Cc: Marcel Holtmann <marcel@...tmann.org>,
LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [lkp] [Bluetooth] 2a3e4086f8e: [ INFO: possible circular locking
dependency detected ]
FYI, we noticed the below changes on
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 2a3e4086f8ea51e0825b5eddc6f0f2623193a428 ("Bluetooth: Unwind l2cap_sock_shutdown()")
+----------------------------------------------------+------------+------------+
> | ccf76154d8 | 2a3e4086f8 |
+----------------------------------------------------+------------+------------+
> boot_successes | 21 | 19 |
> boot_failures | 4 | 22 |
> Out_of_memory:Kill_process | 4 | 9 |
> INFO:possible_circular_locking_dependency_detected | 0 | 21 |
> backtrace:rfcomm_run | 0 | 21 |
+----------------------------------------------------+------------+------------+
[ 10.385588] ======================================================
[ 10.386400] [ INFO: possible circular locking dependency detected ]
[ 10.387216] 4.1.0-12272-g2a3e408 #1 Not tainted
[ 10.387862] -------------------------------------------------------
[ 10.388687] krfcommd/220 is trying to acquire lock:
[ 10.389368] (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+...}, at: [<ffffffff82c9b574>] lock_sock+0xb/0xd
[ 10.390891]
[ 10.390891] but task is already holding lock:
[ 10.391789] (&chan->lock/2){+.+...}, at: [<ffffffff82c9b8c8>] l2cap_chan_lock+0x13/0x15
[ 10.393258]
[ 10.393258] which lock already depends on the new lock.
[ 10.393258]
[ 10.394508]
[ 10.394508] the existing dependency chain (in reverse order) is:
[ 10.395568]
-> #1 (&chan->lock/2){+.+...}:
[ 10.396642] [<ffffffff81113587>] lock_acquire+0x110/0x19c
[ 10.397511] [<ffffffff82e6e6ba>] mutex_lock_nested+0x6b/0x3a0
[ 10.398414] [<ffffffff82c9b8c8>] l2cap_chan_lock+0x13/0x15
[ 10.399283] [<ffffffff82c9c64d>] l2cap_sock_shutdown+0x91/0x2f4
[ 10.400203] [<ffffffff82c9c8f0>] l2cap_sock_release+0x40/0x8b
[ 10.401106] [<ffffffff82a8fd95>] sock_release+0x1f/0x7a
[ 10.401954] [<ffffffff82ca86ff>] rfcomm_session_del+0x2d/0x49
[ 10.402854] [<ffffffff82caabee>] rfcomm_run+0x603/0x61c
[ 10.403701] [<ffffffff810f0ece>] kthread+0xe0/0xe8
[ 10.404508] [<ffffffff82e726df>] ret_from_fork+0x3f/0x70
[ 10.405363]
-> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+...}:
[ 10.406551] [<ffffffff81112ee1>] __lock_acquire+0xc1a/0xf15
[ 10.407437] [<ffffffff81113587>] lock_acquire+0x110/0x19c
[ 10.408305] [<ffffffff82a94aee>] lock_sock_nested+0x7d/0x9b
[ 10.409181] [<ffffffff82c9b574>] lock_sock+0xb/0xd
[ 10.409986] [<ffffffff82c9c82a>] l2cap_sock_shutdown+0x26e/0x2f4
[ 10.410911] [<ffffffff82c9c8f0>] l2cap_sock_release+0x40/0x8b
[ 10.412231] [<ffffffff82a8fd95>] sock_release+0x1f/0x7a
[ 10.413790] [<ffffffff82ca86ff>] rfcomm_session_del+0x2d/0x49
[ 10.415442] [<ffffffff82caabee>] rfcomm_run+0x603/0x61c
[ 10.417001] [<ffffffff810f0ece>] kthread+0xe0/0xe8
[ 10.418516] [<ffffffff82e726df>] ret_from_fork+0x3f/0x70
[ 10.420089]
[ 10.420089] other info that might help us debug this:
[ 10.420089]
[ 10.422360] Possible unsafe locking scenario:
[ 10.422360]
[ 10.424011] CPU0 CPU1
[ 10.443069] ---- ----
[ 10.444123] lock(&chan->lock/2);
[ 10.445485] lock(sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP);
[ 10.447742] lock(&chan->lock/2);
[ 10.449588] lock(sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP);
[ 10.451152]
[ 10.451152] *** DEADLOCK ***
[ 10.451152]
[ 10.453031] 1 lock held by krfcommd/220:
[ 10.454104] #0: (&chan->lock/2){+.+...}, at: [<ffffffff82c9b8c8>] l2cap_chan_lock+0x13/0x15
[ 10.456993]
[ 10.456993] stack backtrace:
[ 10.458366] CPU: 1 PID: 220 Comm: krfcommd Not tainted 4.1.0-12272-g2a3e408 #1
[ 10.460253] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[ 10.462746] ffffffff8510cb10 ffff8800140a3aa8 ffffffff82e4cf86 ffffffff81121ec6
[ 10.465167] ffffffff8510cb10 ffff8800140a3af8 ffffffff82e45287 ffff8800140a3ac8
[ 10.467663] ffff88001409c140 ffff88001409ce80 ffff88001409c140 ffff88001409ce80
[ 10.470091] Call Trace:
[ 10.470885] [<ffffffff82e4cf86>] dump_stack+0x4c/0x65
[ 10.472185] [<ffffffff81121ec6>] ? console_unlock+0x3fe/0x42d
[ 10.473631] [<ffffffff82e45287>] print_circular_bug+0x1f8/0x209
[ 10.475038] [<ffffffff81112ee1>] __lock_acquire+0xc1a/0xf15
[ 10.476302] [<ffffffff81111e77>] ? mark_held_locks+0x52/0x68
[ 10.477814] [<ffffffff81113587>] lock_acquire+0x110/0x19c
[ 10.479177] [<ffffffff82c9b574>] ? lock_sock+0xb/0xd
[ 10.480545] [<ffffffff82a94aee>] lock_sock_nested+0x7d/0x9b
[ 10.481988] [<ffffffff82c9b574>] ? lock_sock+0xb/0xd
[ 10.483278] [<ffffffff82c9b574>] lock_sock+0xb/0xd
[ 10.484025] [<ffffffff82c9c82a>] l2cap_sock_shutdown+0x26e/0x2f4
[ 10.484833] [<ffffffff82caa5eb>] ? rfcomm_process_rx+0xa3f/0xa3f
[ 10.485645] [<ffffffff82e71ff3>] ? _raw_write_unlock+0x28/0x33
[ 10.486462] [<ffffffff82caa5eb>] ? rfcomm_process_rx+0xa3f/0xa3f
[ 10.487259] [<ffffffff82c9c8f0>] l2cap_sock_release+0x40/0x8b
[ 10.488073] [<ffffffff82caa5eb>] ? rfcomm_process_rx+0xa3f/0xa3f
[ 10.488884] [<ffffffff82a8fd95>] sock_release+0x1f/0x7a
[ 10.489605] [<ffffffff82ca86ff>] rfcomm_session_del+0x2d/0x49
[ 10.490404] [<ffffffff82caabee>] rfcomm_run+0x603/0x61c
[ 10.491123] [<ffffffff8110995f>] ? abort_exclusive_wait+0xa2/0xa2
[ 10.492082] [<ffffffff82caa5eb>] ? rfcomm_process_rx+0xa3f/0xa3f
[ 10.492979] [<ffffffff810f0ece>] kthread+0xe0/0xe8
[ 10.493662] [<ffffffff82e71a56>] ? _raw_spin_unlock_irq+0x32/0x3d
[ 10.494499] [<ffffffff82e6e1f1>] ? __wait_for_common+0x42/0x16c
[ 10.495286] [<ffffffff810f0dee>] ? __kthread_parkme+0xad/0xad
[ 10.496103] [<ffffffff82e726df>] ret_from_fork+0x3f/0x70
[ 10.496841] [<ffffffff810f0dee>] ? __kthread_parkme+0xad/0xad
[ 10.497812] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Thanks,
Ying Huang
-------------------------------------
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