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Date: Mon, 19 Aug 2013 22:26:06 -0700
From: Miles Lane <miles.lane@...il.com>
To: LKML <linux-kernel@...r.kernel.org>
Subject: 3.11.0-rc6+: INFO: possible circular locking dependency detected
[ 24.990076] [ INFO: possible circular locking dependency detected ]
[ 24.990086] 3.11.0-rc6+ #154 Not tainted
[ 24.990094] -------------------------------------------------------
[ 24.990103] crda/1159 is trying to acquire lock:
[ 24.990111] (genl_mutex){+.+.+.}, at: [<ffffffff812ff7e6>]
genl_lock+0x12/0x14
[ 24.990134]
[ 24.990134] but task is already holding lock:
[ 24.990144] (nlk->cb_mutex){+.+.+.}, at: [<ffffffff812fdab8>]
netlink_dump+0x1c/0x1da
[ 24.990163]
[ 24.990163] which lock already depends on the new lock.
[ 24.990163]
[ 24.990177]
[ 24.990177] the existing dependency chain (in reverse order) is:
[ 24.990188]
[ 24.990188] -> #1 (nlk->cb_mutex){+.+.+.}:
[ 24.990202] [<ffffffff8107d863>] lock_acquire+0x8f/0xa7
[ 24.990214] [<ffffffff813777ab>] mutex_lock_nested+0x72/0x42a
[ 24.990228] [<ffffffff812fdd26>] __netlink_dump_start+0xb0/0x13b
[ 24.990240] [<ffffffff81300b44>] genl_family_rcv_msg+0x106/0x24f
[ 24.990253] [<ffffffff81300cc8>] genl_rcv_msg+0x3b/0x5b
[ 24.990264] [<ffffffff812ff528>] netlink_rcv_skb+0x44/0x86
[ 24.990276] [<ffffffff812ff98b>] genl_rcv+0x23/0x32
[ 24.990287] [<ffffffff812ff033>] netlink_unicast+0xe2/0x166
[ 24.990299] [<ffffffff812ff3bb>] netlink_sendmsg+0x304/0x34e
[ 24.990311] [<ffffffff812cb91a>] __sock_sendmsg_nosec+0x25/0x27
[ 24.990324] [<ffffffff812cdf23>] sock_sendmsg+0x54/0x70
[ 24.990336] [<ffffffff812ce17b>] ___sys_sendmsg+0x1fe/0x28e
[ 24.990348] [<ffffffff812cf410>] __sys_sendmsg+0x3d/0x5b
[ 24.990359] [<ffffffff812cf43b>] SyS_sendmsg+0xd/0x17
[ 24.990370] [<ffffffff8137fc24>] tracesys+0xdd/0xe2
[ 24.990382]
[ 24.990382] -> #0 (genl_mutex){+.+.+.}:
[ 24.990394] [<ffffffff8107d4ea>] __lock_acquire+0xb5f/0xe49
[ 24.990406] [<ffffffff8107d863>] lock_acquire+0x8f/0xa7
[ 24.990417] [<ffffffff813777ab>] mutex_lock_nested+0x72/0x42a
[ 24.990429] [<ffffffff812ff7e6>] genl_lock+0x12/0x14
[ 24.990440] [<ffffffff81300969>] ctrl_dumpfamily+0x42/0x117
[ 24.990452] [<ffffffff812fdb24>] netlink_dump+0x88/0x1da
[ 24.990463] [<ffffffff812fe03c>] netlink_recvmsg+0x16f/0x2f4
[ 24.990475] [<ffffffff812cb945>] __sock_recvmsg_nosec+0x29/0x2b
[ 24.990487] [<ffffffff812ce26a>] sock_recvmsg+0x5f/0x7d
[ 24.990499] [<ffffffff812ceae1>] ___sys_recvmsg+0x155/0x21f
[ 24.990510] [<ffffffff812cf5f4>] __sys_recvmsg+0x3d/0x5b
[ 24.990522] [<ffffffff812cf61f>] SyS_recvmsg+0xd/0x17
[ 24.990532] [<ffffffff8137fc24>] tracesys+0xdd/0xe2
[ 24.990544]
[ 24.990544] other info that might help us debug this:
[ 24.990544]
[ 24.990557] Possible unsafe locking scenario:
[ 24.990557]
[ 24.990567] CPU0 CPU1
[ 24.990575] ---- ----
[ 24.990582] lock(nlk->cb_mutex);
[ 24.990591] lock(genl_mutex);
[ 24.990602] lock(nlk->cb_mutex);
[ 24.990612] lock(genl_mutex);
[ 24.990620]
[ 24.990620] *** DEADLOCK ***
[ 24.990620]
[ 24.990633] 1 lock held by crda/1159:
[ 24.990640] #0: (nlk->cb_mutex){+.+.+.}, at: [<ffffffff812fdab8>]
netlink_dump+0x1c/0x1da
[ 24.990660]
[ 24.990660] stack backtrace:
[ 24.990671] CPU: 1 PID: 1159 Comm: crda Not tainted 3.11.0-rc6+ #154
[ 24.990681] Hardware name: ASUSTeK Computer Inc. UL50VT
/UL50VT , BIOS 217 03/01/2010
[ 24.990695] 0000000000000000 ffff8801338bb920 ffffffff81374ba4
ffffffff81b842b0
[ 24.990711] ffff8801338bb960 ffffffff81370581 ffff8801339b4180
ffff8801339b4180
[ 24.990728] ffff8801339b47a0 ffff8801339b4778 0000000000000001
00000000006520ee
[ 24.990744] Call Trace:
[ 24.990754] [<ffffffff81374ba4>] dump_stack+0x4e/0x82
[ 24.990766] [<ffffffff81370581>] print_circular_bug+0x1f6/0x204
[ 24.990778] [<ffffffff8107d4ea>] __lock_acquire+0xb5f/0xe49
[ 24.990791] [<ffffffff8107b7ea>] ? trace_hardirqs_on+0xd/0xf
[ 24.990803] [<ffffffff812ff7e6>] ? genl_lock+0x12/0x14
[ 24.990814] [<ffffffff8107d863>] lock_acquire+0x8f/0xa7
[ 24.990825] [<ffffffff812ff7e6>] ? genl_lock+0x12/0x14
[ 24.990837] [<ffffffff813777ab>] mutex_lock_nested+0x72/0x42a
[ 24.990849] [<ffffffff812ff7e6>] ? genl_lock+0x12/0x14
[ 24.990860] [<ffffffff812ff7e6>] ? genl_lock+0x12/0x14
[ 24.990873] [<ffffffff812d594f>] ? __alloc_skb+0x76/0x19c
[ 24.990884] [<ffffffff812ff7e6>] genl_lock+0x12/0x14
[ 24.990896] [<ffffffff81300969>] ctrl_dumpfamily+0x42/0x117
[ 24.990907] [<ffffffff812d597b>] ? __alloc_skb+0xa2/0x19c
[ 24.990919] [<ffffffff812fdb24>] netlink_dump+0x88/0x1da
[ 24.990931] [<ffffffff812fe03c>] netlink_recvmsg+0x16f/0x2f4
[ 24.990943] [<ffffffff812cb945>] __sock_recvmsg_nosec+0x29/0x2b
[ 24.990955] [<ffffffff812ce26a>] sock_recvmsg+0x5f/0x7d
[ 24.990967] [<ffffffff8107dc4b>] ? lock_release_non_nested+0x123/0x21d
[ 24.990979] [<ffffffff8107dc4b>] ? lock_release_non_nested+0x123/0x21d
[ 24.990993] [<ffffffff812d8c10>] ? verify_iovec+0x58/0xa6
[ 24.991005] [<ffffffff812ceae1>] ___sys_recvmsg+0x155/0x21f
[ 24.991018] [<ffffffff81052850>] ? up_read+0x22/0x25
[ 24.991030] [<ffffffff8137d980>] ? __do_page_fault+0x321/0x3a5
[ 24.991043] [<ffffffff81110b36>] ? fcheck_files+0x9f/0xe0
[ 24.991055] [<ffffffff811110e8>] ? fget_light+0x30/0x90
[ 24.991066] [<ffffffff812cf5f4>] __sys_recvmsg+0x3d/0x5b
[ 24.991077] [<ffffffff812cf61f>] SyS_recvmsg+0xd/0x17
[ 24.991089] [<ffffffff8137fc24>] tracesys+0xdd/0xe2
--
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