reiserfs: Fix journal mutex <-> inode mutex lock inversion
We need to relax the reiserfs lock before locking the inode mutex
from xattr_unlink(), otherwise we'll face the usual bad dependencies:
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.32-atom #178
-------------------------------------------------------
rm/3202 is trying to acquire lock:
(&journal->j_mutex){+.+...}, at: [<c113c234>] do_journal_begin_r+0x94/0x360
but task is already holding lock:
(&sb->s_type->i_mutex_key#4/2){+.+...}, at: [<c1142a67>] xattr_unlink+0x57/0xb0
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&sb->s_type->i_mutex_key#4/2){+.+...}:
[<c105ea7f>] __lock_acquire+0x11ff/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c1401a7b>] mutex_lock_nested+0x5b/0x340
[<c1142a67>] xattr_unlink+0x57/0xb0
[<c1143179>] delete_one_xattr+0x29/0x100
[<c11427bb>] reiserfs_for_each_xattr+0x10b/0x290
[<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
[<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
[<c10c9c32>] generic_delete_inode+0xa2/0x170
[<c10c9d4f>] generic_drop_inode+0x4f/0x70
[<c10c8b07>] iput+0x47/0x50
[<c10c0965>] do_unlinkat+0xd5/0x160
[<c10c0b13>] sys_unlinkat+0x23/0x40
[<c1002ec4>] sysenter_do_call+0x12/0x32
-> #1 (&REISERFS_SB(s)->lock){+.+.+.}:
[<c105ea7f>] __lock_acquire+0x11ff/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c1401a7b>] mutex_lock_nested+0x5b/0x340
[<c1143359>] reiserfs_write_lock+0x29/0x40
[<c113c23c>] do_journal_begin_r+0x9c/0x360
[<c113c680>] journal_begin+0x80/0x130
[<c1127363>] reiserfs_remount+0x223/0x4e0
[<c10b6dd6>] do_remount_sb+0xa6/0x140
[<c10ce6a0>] do_mount+0x560/0x750
[<c10ce914>] sys_mount+0x84/0xb0
[<c1002ec4>] sysenter_do_call+0x12/0x32
-> #0 (&journal->j_mutex){+.+...}:
[<c105f176>] __lock_acquire+0x18f6/0x19e0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c1401a7b>] mutex_lock_nested+0x5b/0x340
[<c113c234>] do_journal_begin_r+0x94/0x360
[<c113c680>] journal_begin+0x80/0x130
[<c1116d63>] reiserfs_unlink+0x83/0x2e0
[<c1142a74>] xattr_unlink+0x64/0xb0
[<c1143179>] delete_one_xattr+0x29/0x100
[<c11427bb>] reiserfs_for_each_xattr+0x10b/0x290
[<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
[<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
[<c10c9c32>] generic_delete_inode+0xa2/0x170
[<c10c9d4f>] generic_drop_inode+0x4f/0x70
[<c10c8b07>] iput+0x47/0x50
[<c10c0965>] do_unlinkat+0xd5/0x160
[<c10c0b13>] sys_unlinkat+0x23/0x40
[<c1002ec4>] sysenter_do_call+0x12/0x32
other info that might help us debug this:
2 locks held by rm/3202:
#0: (&sb->s_type->i_mutex_key#4/3){+.+.+.}, at: [<c114274b>] reiserfs_for_each_xattr+0x9b/0x290
#1: (&sb->s_type->i_mutex_key#4/2){+.+...}, at: [<c1142a67>] xattr_unlink+0x57/0xb0
stack backtrace:
Pid: 3202, comm: rm Not tainted 2.6.32-atom #178
Call Trace:
[<c13ff9e3>] ? printk+0x18/0x1a
[<c105d33a>] print_circular_bug+0xca/0xd0
[<c105f176>] __lock_acquire+0x18f6/0x19e0
[<c1142a67>] ? xattr_unlink+0x57/0xb0
[<c105f2c8>] lock_acquire+0x68/0x90
[<c113c234>] ? do_journal_begin_r+0x94/0x360
[<c113c234>] ? do_journal_begin_r+0x94/0x360
[<c1401a7b>] mutex_lock_nested+0x5b/0x340
[<c113c234>] ? do_journal_begin_r+0x94/0x360
[<c113c234>] do_journal_begin_r+0x94/0x360
[<c10411b6>] ? run_timer_softirq+0x1a6/0x220
[<c103cb00>] ? __do_softirq+0x50/0x140
[<c113c680>] journal_begin+0x80/0x130
[<c103cba2>] ? __do_softirq+0xf2/0x140
[<c104f72f>] ? hrtimer_interrupt+0xdf/0x220
[<c1116d63>] reiserfs_unlink+0x83/0x2e0
[<c105c932>] ? mark_held_locks+0x62/0x80
[<c11b8d08>] ? trace_hardirqs_on_thunk+0xc/0x10
[<c1002fd8>] ? restore_all_notrace+0x0/0x18
[<c1142a67>] ? xattr_unlink+0x57/0xb0
[<c1142a74>] xattr_unlink+0x64/0xb0
[<c1143179>] delete_one_xattr+0x29/0x100
[<c11427bb>] reiserfs_for_each_xattr+0x10b/0x290
[<c1143150>] ? delete_one_xattr+0x0/0x100
[<c1401cb9>] ? mutex_lock_nested+0x299/0x340
[<c11429ba>] reiserfs_delete_xattrs+0x1a/0x60
[<c1143309>] ? reiserfs_write_lock_once+0x29/0x50
[<c111ea2f>] reiserfs_delete_inode+0x9f/0x150
[<c11b0d1f>] ? _atomic_dec_and_lock+0x4f/0x70
[<c111e990>] ? reiserfs_delete_inode+0x0/0x150
[<c10c9c32>] generic_delete_inode+0xa2/0x170
[<c10c9d4f>] generic_drop_inode+0x4f/0x70
[<c10c8b07>] iput+0x47/0x50
[<c10c0965>] do_unlinkat+0xd5/0x160
[<c1401068>] ? mutex_unlock+0x8/0x10
[<c10c3e0d>] ? vfs_readdir+0x7d/0xb0
[<c10c3af0>] ? filldir64+0x0/0xf0
[<c1002ef3>] ? sysenter_exit+0xf/0x16
[<c105cbe4>] ? trace_hardirqs_on_caller+0x124/0x170
[<c10c0b13>] sys_unlinkat+0x23/0x40
[<c1002ec4>] sysenter_do_call+0x12/0x32
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Christian Kujau <lists@nerdbynature.de>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
1 file changed