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Date: Sat, 5 Nov 2011 22:24:17 +0530
From: Madura Anushanga <madura.x86@...il.com>
To: linux-kernel@...r.kernel.org
Subject: Re: Linux dead lock on asus notebook
Hi,
I'm using an Asus K42Jc notebook, which freezes up randomly(after
about 5-6hrs of usage). I compiled a kernel with debugging on and got
this message on dmesg,
[ 226.687892] =======================================================
[ 226.687896] [ INFO: possible circular locking dependency detected ]
[ 226.687899] 3.0.4-custom #4
[ 226.687900] -------------------------------------------------------
[ 226.687902] apt-get/2166 is trying to acquire lock:
[ 226.687904] (&sb->s_type->i_mutex_key#13){+.+.+.}, at:
[<ffffffff8122cd26>] ext4_evict_inode+0x26/0x3a0
[ 226.687916]
[ 226.687917] but task is already holding lock:
[ 226.687919] (&mm->mmap_sem){++++++}, at: [<ffffffff8114c7d8>]
sys_munmap+0x48/0x80
[ 226.687924]
[ 226.687925] which lock already depends on the new lock.
[ 226.687925]
[ 226.687927]
[ 226.687927] the existing dependency chain (in reverse order) is:
[ 226.687929]
[ 226.687929] -> #1 (&mm->mmap_sem){++++++}:
[ 226.687933] [<ffffffff810a126a>] check_prevs_add+0xfa/0x160
[ 226.687939] [<ffffffff810a18c0>] validate_chain.isra.38+0x5f0/0x720
[ 226.687943] [<ffffffff810a22c8>] __lock_acquire+0x458/0x990
[ 226.687946] [<ffffffff810a2d7f>] lock_acquire+0x9f/0x140
[ 226.687949] [<ffffffff81141fc9>] might_fault+0x89/0xb0
[ 226.687954] [<ffffffff81195ca7>] filldir+0x77/0xe0
[ 226.687960] [<ffffffff8121ff0a>] call_filldir+0x9a/0xd0
[ 226.687963] [<ffffffff812200c2>] ext4_dx_readdir+0x182/0x240
[ 226.687966] [<ffffffff81220362>] ext4_readdir+0x72/0x400
[ 226.687969] [<ffffffff81195f70>] vfs_readdir+0xb0/0xe0
[ 226.687971] [<ffffffff81196099>] sys_getdents+0x89/0x100
[ 226.687974] [<ffffffff81684a82>] system_call_fastpath+0x16/0x1b
[ 226.687980]
[ 226.687980] -> #0 (&sb->s_type->i_mutex_key#13){+.+.+.}:
[ 226.687984] [<ffffffff810a1168>] check_prev_add+0x6b8/0x6c0
[ 226.687987] [<ffffffff810a126a>] check_prevs_add+0xfa/0x160
[ 226.687990] [<ffffffff810a18c0>] validate_chain.isra.38+0x5f0/0x720
[ 226.687993] [<ffffffff810a22c8>] __lock_acquire+0x458/0x990
[ 226.687996] [<ffffffff810a2d7f>] lock_acquire+0x9f/0x140
[ 226.687999] [<ffffffff81679635>] mutex_lock_nested+0x55/0x330
[ 226.688004] [<ffffffff8122cd26>] ext4_evict_inode+0x26/0x3a0
[ 226.688007] [<ffffffff8119e95b>] evict+0x8b/0x170
[ 226.688011] [<ffffffff8119eb68>] iput_final+0xd8/0x1b0
[ 226.688014] [<ffffffff8119ec78>] iput+0x38/0x50
[ 226.688016] [<ffffffff811984b8>] dentry_iput+0x98/0xe0
[ 226.688019] [<ffffffff8119b61e>] dput+0x14e/0x280
[ 226.688022] [<ffffffff811836a0>] __fput+0x160/0x220
[ 226.688027] [<ffffffff81183785>] fput+0x25/0x30
[ 226.688030] [<ffffffff81149be6>] remove_vma+0x56/0xa0
[ 226.688034] [<ffffffff8114b063>] do_munmap+0x1f3/0x2f0
[ 226.688037] [<ffffffff8114c7e6>] sys_munmap+0x56/0x80
[ 226.688039] [<ffffffff81684a82>] system_call_fastpath+0x16/0x1b
[ 226.688043]
[ 226.688043] other info that might help us debug this:
[ 226.688044]
[ 226.688045] Possible unsafe locking scenario:
[ 226.688046]
[ 226.688047] CPU0 CPU1
[ 226.688048] ---- ----
[ 226.688050] lock(&mm->mmap_sem);
[ 226.688052] lock(&sb->s_type->i_mutex_key);
[ 226.688055] lock(&mm->mmap_sem);
[ 226.688057] lock(&sb->s_type->i_mutex_key);
[ 226.688059]
[ 226.688060] *** DEADLOCK ***
[ 226.688060]
[ 226.688062] 1 lock held by apt-get/2166:
[ 226.688064] #0: (&mm->mmap_sem){++++++}, at: [<ffffffff8114c7d8>]
sys_munmap+0x48/0x80
[ 226.688068]
[ 226.688069] stack backtrace:
[ 226.688071] Pid: 2166, comm: apt-get Tainted: G C 3.0.4-custom #4
[ 226.688074] Call Trace:
[ 226.688079] [<ffffffff816619e2>] print_circular_bug+0xd3/0xe4
[ 226.688082] [<ffffffff810a1168>] check_prev_add+0x6b8/0x6c0
[ 226.688085] [<ffffffff8109dc53>] ? __bfs+0x23/0x270
[ 226.688088] [<ffffffff810a126a>] check_prevs_add+0xfa/0x160
[ 226.688091] [<ffffffff810a18c0>] validate_chain.isra.38+0x5f0/0x720
[ 226.688094] [<ffffffff810a22c8>] __lock_acquire+0x458/0x990
[ 226.688097] [<ffffffff810a2d7f>] lock_acquire+0x9f/0x140
[ 226.688100] [<ffffffff8122cd26>] ? ext4_evict_inode+0x26/0x3a0
[ 226.688103] [<ffffffff81679635>] mutex_lock_nested+0x55/0x330
[ 226.688106] [<ffffffff8122cd26>] ? ext4_evict_inode+0x26/0x3a0
[ 226.688108] [<ffffffff8119e916>] ? evict+0x46/0x170
[ 226.688111] [<ffffffff8122cd26>] ext4_evict_inode+0x26/0x3a0
[ 226.688114] [<ffffffff8119e95b>] evict+0x8b/0x170
[ 226.688116] [<ffffffff8119eb68>] iput_final+0xd8/0x1b0
[ 226.688119] [<ffffffff8119ec78>] iput+0x38/0x50
[ 226.688121] [<ffffffff811984b8>] dentry_iput+0x98/0xe0
[ 226.688123] [<ffffffff8119b61e>] dput+0x14e/0x280
[ 226.688126] [<ffffffff811836a0>] __fput+0x160/0x220
[ 226.688129] [<ffffffff81183785>] fput+0x25/0x30
[ 226.688131] [<ffffffff81149be6>] remove_vma+0x56/0xa0
[ 226.688134] [<ffffffff8114b063>] do_munmap+0x1f3/0x2f0
[ 226.688137] [<ffffffff8114c7e6>] sys_munmap+0x56/0x80
[ 226.688139] [<ffffffff81684a82>] system_call_fastpath+0x16/0x1b
This time it was apt-get and before it was another executable, this
dead lock happens after every start up for some process.
Thanks,
- Madura A.
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