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Date: Sun, 4 Sep 2011 16:44:17 GMT
From: bugzilla-daemon@...zilla.kernel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 42362] New: [ext4] possible circular locking dependency
detected
https://bugzilla.kernel.org/show_bug.cgi?id=42362
Summary: [ext4] possible circular locking dependency detected
Product: File System
Version: 2.5
Kernel Version: 3.0.1-rc3
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
AssignedTo: fs_ext4@...nel-bugs.osdl.org
ReportedBy: combuster@...hlinux.us
Regression: No
I found this after I've noticed that transfering files from my camera (Sony
HX9V) withing shotwell is painfully slow. I'm not sure if this is the culprit
but I wanted to report this nevertheless...
Here is dmesg output:
[ 137.861302] =======================================================
[ 137.861304] [ INFO: possible circular locking dependency detected ]
[ 137.861306] 3.1.0-rc3-RC #1
[ 137.861307] -------------------------------------------------------
[ 137.861309] shotwell/1250 is trying to acquire lock:
[ 137.861311] (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<ffffffffa00a5a46>]
ext4_evict_inode+0x1e/0x2c6 [ext4]
[ 137.861321]
[ 137.861321] but task is already holding lock:
[ 137.861323] (&mm->mmap_sem){++++++}, at: [<ffffffff810bf2ae>]
sys_munmap+0x36/0x5b
[ 137.861329]
[ 137.861329] which lock already depends on the new lock.
[ 137.861330]
[ 137.861331]
[ 137.861331] the existing dependency chain (in reverse order) is:
[ 137.861333]
[ 137.861333] -> #1 (&mm->mmap_sem){++++++}:
[ 137.861336] [<ffffffff8106bdf0>] check_prevs_add+0x8b/0x104
[ 137.861341] [<ffffffff8106c1ca>] validate_chain.isra.37+0x361/0x39d
[ 137.861344] [<ffffffff8106c89a>] __lock_acquire+0x36f/0x3e8
[ 137.861346] [<ffffffff8106cd31>] lock_acquire+0x7e/0x99
[ 137.861349] [<ffffffff810b7ffd>] might_fault+0x7b/0x9e
[ 137.861353] [<ffffffff810f0e2a>] filldir+0x6a/0xc2
[ 137.861357] [<ffffffffa009dd6d>] call_filldir+0x91/0xb8 [ext4]
[ 137.861361] [<ffffffffa009df13>] ext4_dx_readdir+0x16f/0x1d2 [ext4]
[ 137.861365] [<ffffffffa009e116>] ext4_readdir+0x68/0x37e [ext4]
[ 137.861369] [<ffffffff810f1070>] vfs_readdir+0x76/0xac
[ 137.861372] [<ffffffff810f1182>] sys_getdents+0x79/0xc9
[ 137.861375] [<ffffffff8135b512>] system_call_fastpath+0x16/0x1b
[ 137.861378]
[ 137.861379] -> #0 (&sb->s_type->i_mutex_key#10){+.+.+.}:
[ 137.861382] [<ffffffff8106bbc6>] check_prev_add+0x68/0x207
[ 137.861385] [<ffffffff8106bdf0>] check_prevs_add+0x8b/0x104
[ 137.861387] [<ffffffff8106c1ca>] validate_chain.isra.37+0x361/0x39d
[ 137.861390] [<ffffffff8106c89a>] __lock_acquire+0x36f/0x3e8
[ 137.861392] [<ffffffff8106cd31>] lock_acquire+0x7e/0x99
[ 137.861395] [<ffffffff81355060>] __mutex_lock_common+0x61/0x470
[ 137.861398] [<ffffffff81355556>] mutex_lock_nested+0x36/0x3b
[ 137.861401] [<ffffffffa00a5a46>] ext4_evict_inode+0x1e/0x2c6 [ext4]
[ 137.861406] [<ffffffff810f6c14>] evict+0xa1/0x15b
[ 137.861409] [<ffffffff810f6e3f>] iput_final+0x171/0x17a
[ 137.861411] [<ffffffff810f6e80>] iput+0x38/0x3c
[ 137.861413] [<ffffffff810f3210>] dentry_iput+0x96/0xa6
[ 137.861415] [<ffffffff810f3bdf>] dentry_kill+0xaa/0xc1
[ 137.861418] [<ffffffff810f3ff2>] dput+0x10d/0x11d
[ 137.861420] [<ffffffff810e42be>] __fput+0x18a/0x1a2
[ 137.861423] [<ffffffff810e42eb>] fput+0x15/0x17
[ 137.861425] [<ffffffff810bdfd6>] remove_vma+0x4c/0x7d
[ 137.861427] [<ffffffff810bf154>] do_munmap+0x262/0x27b
[ 137.861430] [<ffffffff810bf2bc>] sys_munmap+0x44/0x5b
[ 137.861432] [<ffffffff8135b512>] system_call_fastpath+0x16/0x1b
[ 137.861435]
[ 137.861435] other info that might help us debug this:
[ 137.861436]
[ 137.861437] Possible unsafe locking scenario:
[ 137.861438]
[ 137.861439] CPU0 CPU1
[ 137.861440] ---- ----
[ 137.861441] lock(&mm->mmap_sem);
[ 137.861443] lock(&sb->s_type->i_mutex_key);
[ 137.861446] lock(&mm->mmap_sem);
[ 137.861448] lock(&sb->s_type->i_mutex_key);
[ 137.861450]
[ 137.861450] *** DEADLOCK ***
[ 137.861451]
[ 137.861452] 1 lock held by shotwell/1250:
[ 137.861453] #0: (&mm->mmap_sem){++++++}, at: [<ffffffff810bf2ae>]
sys_munmap+0x36/0x5b
[ 137.861457]
[ 137.861458] stack backtrace:
[ 137.861460] Pid: 1250, comm: shotwell Not tainted 3.1.0-rc3-RC #1
[ 137.861461] Call Trace:
[ 137.861465] [<ffffffff8134770a>] print_circular_bug+0xcc/0xdd
[ 137.861467] [<ffffffff8106bbc6>] check_prev_add+0x68/0x207
[ 137.861470] [<ffffffff8106bdf0>] check_prevs_add+0x8b/0x104
[ 137.861473] [<ffffffff8106c1ca>] validate_chain.isra.37+0x361/0x39d
[ 137.861476] [<ffffffff8106c89a>] __lock_acquire+0x36f/0x3e8
[ 137.861479] [<ffffffff8106cd31>] lock_acquire+0x7e/0x99
[ 137.861484] [<ffffffffa00a5a46>] ? ext4_evict_inode+0x1e/0x2c6 [ext4]
[ 137.861487] [<ffffffff81355060>] __mutex_lock_common+0x61/0x470
[ 137.861491] [<ffffffffa00a5a46>] ? ext4_evict_inode+0x1e/0x2c6 [ext4]
[ 137.861496] [<ffffffffa00a5a46>] ? ext4_evict_inode+0x1e/0x2c6 [ext4]
[ 137.861499] [<ffffffff8106cc3e>] ? __lock_release+0x8c/0x9c
[ 137.861502] [<ffffffff81355556>] mutex_lock_nested+0x36/0x3b
[ 137.861507] [<ffffffffa00a5a46>] ext4_evict_inode+0x1e/0x2c6 [ext4]
[ 137.861512] [<ffffffffa00a5a28>] ? ext4_da_writepages+0x395/0x395 [ext4]
[ 137.861514] [<ffffffff810f6c14>] evict+0xa1/0x15b
[ 137.861517] [<ffffffff810f6e3f>] iput_final+0x171/0x17a
[ 137.861519] [<ffffffff810f6e80>] iput+0x38/0x3c
[ 137.861521] [<ffffffff810f3210>] dentry_iput+0x96/0xa6
[ 137.861523] [<ffffffff810f3bdf>] dentry_kill+0xaa/0xc1
[ 137.861525] [<ffffffff810f3ff2>] dput+0x10d/0x11d
[ 137.861528] [<ffffffff810e42be>] __fput+0x18a/0x1a2
[ 137.861530] [<ffffffff810e42eb>] fput+0x15/0x17
[ 137.861533] [<ffffffff810bdfd6>] remove_vma+0x4c/0x7d
[ 137.861535] [<ffffffff810bf154>] do_munmap+0x262/0x27b
[ 137.861537] [<ffffffff810bf2bc>] sys_munmap+0x44/0x5b
[ 137.861540] [<ffffffff8135b512>] system_call_fastpath+0x16/0x1b
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