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Date: Fri, 1 Jun 2012 20:36:03 +0200
From: Jan Kara <jack@...e.cz>
To: Dave Jones <davej@...hat.com>
Cc: Linux Kernel <linux-kernel@...r.kernel.org>,
linux-ext4@...r.kernel.org
Subject: Re: 3.3.7 lockdep report from jbd.
On Tue 29-05-12 22:37:47, Dave Jones wrote:
> Just saw this on my backup server during an rsync.
> I'll see if I can reproduce it in 3.4 later.
>
> Dave
>
>
> =========================================================
> [ INFO: possible irq lock inversion dependency detected ]
> 3.3.7-1.fc16.x86_64.debug #1 Not tainted
> ---------------------------------------------------------
> kswapd0/37 just changed the state of lock:
> (jbd2_handle){+.+.-.}, at: [<ffffffff8128b457>] start_this_handle+0x507/0x700
> but this lock took another, RECLAIM_FS-unsafe lock in the past:
> (&isec->lock){+.+.+.}
>
> and interrupts could create inverse lock ordering between them.
>
>
> other info that might help us debug this:
> Possible interrupt unsafe locking scenario:
>
> CPU0 CPU1
> ---- ----
> lock(&isec->lock);
> local_irq_disable();
> lock(jbd2_handle);
> lock(&isec->lock);
> <Interrupt>
> lock(jbd2_handle);
Frankly, this looks like a false positive and I have a hard time
understanding how lockdep even came to the above conclusion.
Certainly we never take jbd2_handle in an interrupt. Lockdep is correct
jbd2_handle is taken in reclaim, although I'm reasonably sure we never end
up taking isec->lock under jbd2_handle in reclaim.
I'm not sure how to silence this warning though...
Honza
>
> *** DEADLOCK ***
>
> 2 locks held by kswapd0/37:
> #0: (shrinker_rwsem){++++..}, at: [<ffffffff8116304c>] shrink_slab+0x3c/0x4b0
> #1: (&type->s_umount_key#20){++++..}, at: [<ffffffff811bf654>] grab_super_passive+0x44/0x90
>
> the shortest dependencies between 2nd lock and 1st lock:
> -> (&isec->lock){+.+.+.} ops: 582449 {
> HARDIRQ-ON-W at:
> [<ffffffff810cbf69>] __lock_acquire+0x619/0x1c20
> [<ffffffff810cdc5d>] lock_acquire+0x9d/0x200
> [<ffffffff8169ef94>] mutex_lock_nested+0x74/0x3a0
> [<ffffffff812c68e2>] inode_doinit_with_dentry+0xc2/0x650
> [<ffffffff812c6e8c>] selinux_d_instantiate+0x1c/0x20
> [<ffffffff812bd75b>] security_d_instantiate+0x1b/0x30
> [<ffffffff811d4081>] d_instantiate+0x61/0x80
> [<ffffffff811d69d3>] d_alloc_root+0x43/0x50
> [<ffffffff81237f62>] sysfs_mount+0x182/0x220
> [<ffffffff811bffe3>] mount_fs+0x43/0x1b0
> [<ffffffff811dd7f2>] vfs_kern_mount+0x72/0x100
> [<ffffffff811dd899>] kern_mount_data+0x19/0x30
> [<ffffffff81ef30b2>] sysfs_init+0x5a/0xb5
> [<ffffffff81ef1862>] mnt_init+0xa1/0x181
> [<ffffffff81ef14fc>] vfs_caches_init+0xfb/0x10c
> [<ffffffff81ecebf3>] start_kernel+0x3b5/0x3fc
> [<ffffffff81ece346>] x86_64_start_reservations+0x131/0x135
> [<ffffffff81ece44c>] x86_64_start_kernel+0x102/0x111
> SOFTIRQ-ON-W at:
> [<ffffffff810cbf98>] __lock_acquire+0x648/0x1c20
> [<ffffffff810cdc5d>] lock_acquire+0x9d/0x200
> [<ffffffff8169ef94>] mutex_lock_nested+0x74/0x3a0
> [<ffffffff812c68e2>] inode_doinit_with_dentry+0xc2/0x650
> [<ffffffff812c6e8c>] selinux_d_instantiate+0x1c/0x20
> [<ffffffff812bd75b>] security_d_instantiate+0x1b/0x30
> [<ffffffff811d4081>] d_instantiate+0x61/0x80
> [<ffffffff811d69d3>] d_alloc_root+0x43/0x50
> [<ffffffff81237f62>] sysfs_mount+0x182/0x220
> [<ffffffff811bffe3>] mount_fs+0x43/0x1b0
> [<ffffffff811dd7f2>] vfs_kern_mount+0x72/0x100
> [<ffffffff811dd899>] kern_mount_data+0x19/0x30
> [<ffffffff81ef30b2>] sysfs_init+0x5a/0xb5
> [<ffffffff81ef1862>] mnt_init+0xa1/0x181
> [<ffffffff81ef14fc>] vfs_caches_init+0xfb/0x10c
> [<ffffffff81ecebf3>] start_kernel+0x3b5/0x3fc
> [<ffffffff81ece346>] x86_64_start_reservations+0x131/0x135
> [<ffffffff81ece44c>] x86_64_start_kernel+0x102/0x111
> RECLAIM_FS-ON-W at:
> [<ffffffff810ce626>] mark_held_locks+0x86/0x150
> [<ffffffff810cedb1>] lockdep_trace_alloc+0x71/0xd0
> [<ffffffff811591d6>] __alloc_pages_nodemask+0x86/0xa90
> [<ffffffff81194063>] alloc_pages_current+0xa3/0x110
> [<ffffffff81154b94>] __get_free_pages+0x14/0x50
> [<ffffffff812c6b4b>] inode_doinit_with_dentry+0x32b/0x650
> [<ffffffff812c6f56>] sb_finish_set_opts+0xc6/0x260
> [<ffffffff812c753c>] selinux_set_mnt_opts+0x32c/0x540
> [<ffffffff812c77b0>] superblock_doinit+0x60/0xc0
> [<ffffffff812c78f0>] delayed_superblock_init+0x10/0x20
> [<ffffffff811bfa41>] iterate_supers+0xf1/0x100
> [<ffffffff812cae13>] selinux_complete_init+0x33/0x40
> [<ffffffff812da95b>] security_load_policy+0x35b/0x4e0
> [<ffffffff812ccb6f>] sel_write_load+0x9f/0x790
> [<ffffffff811bb506>] vfs_write+0xb6/0x180
> [<ffffffff811bb82d>] sys_write+0x4d/0x90
> [<ffffffff816abc29>] system_call_fastpath+0x16/0x1b
> INITIAL USE at:
> [<ffffffff810cbc70>] __lock_acquire+0x320/0x1c20
> [<ffffffff810cdc5d>] lock_acquire+0x9d/0x200
> [<ffffffff8169ef94>] mutex_lock_nested+0x74/0x3a0
> [<ffffffff812c68e2>] inode_doinit_with_dentry+0xc2/0x650
> [<ffffffff812c6e8c>] selinux_d_instantiate+0x1c/0x20
> [<ffffffff812bd75b>] security_d_instantiate+0x1b/0x30
> [<ffffffff811d4081>] d_instantiate+0x61/0x80
> [<ffffffff811d69d3>] d_alloc_root+0x43/0x50
> [<ffffffff81237f62>] sysfs_mount+0x182/0x220
> [<ffffffff811bffe3>] mount_fs+0x43/0x1b0
> [<ffffffff811dd7f2>] vfs_kern_mount+0x72/0x100
> [<ffffffff811dd899>] kern_mount_data+0x19/0x30
> [<ffffffff81ef30b2>] sysfs_init+0x5a/0xb5
> [<ffffffff81ef1862>] mnt_init+0xa1/0x181
> [<ffffffff81ef14fc>] vfs_caches_init+0xfb/0x10c
> [<ffffffff81ecebf3>] start_kernel+0x3b5/0x3fc
> [<ffffffff81ece346>] x86_64_start_reservations+0x131/0x135
> [<ffffffff81ece44c>] x86_64_start_kernel+0x102/0x111
> }
> ... key at: [<ffffffff829db510>] __key.51824+0x0/0x8
> ... acquired at:
> [<ffffffff810cdc5d>] lock_acquire+0x9d/0x200
> [<ffffffff8169ef94>] mutex_lock_nested+0x74/0x3a0
> [<ffffffff812c68e2>] inode_doinit_with_dentry+0xc2/0x650
> [<ffffffff812c6e8c>] selinux_d_instantiate+0x1c/0x20
> [<ffffffff812bd75b>] security_d_instantiate+0x1b/0x30
> [<ffffffff811d4081>] d_instantiate+0x61/0x80
> [<ffffffff812510b6>] ext4_add_nondir+0x76/0x80
> [<ffffffff812531b6>] ext4_symlink+0x1a6/0x330
> [<ffffffff811ca2d9>] vfs_symlink+0x99/0x100
> [<ffffffff811cdb73>] sys_symlinkat+0xb3/0xd0
> [<ffffffff811cdba6>] sys_symlink+0x16/0x20
> [<ffffffff816abc29>] system_call_fastpath+0x16/0x1b
>
> -> (jbd2_handle){+.+.-.} ops: 20071115 {
> HARDIRQ-ON-W at:
> [<ffffffff810cbf69>] __lock_acquire+0x619/0x1c20
> [<ffffffff810cdc5d>] lock_acquire+0x9d/0x200
> [<ffffffff8128b486>] start_this_handle+0x536/0x700
> [<ffffffff8128b77a>] jbd2__journal_start+0x12a/0x1a0
> [<ffffffff8128b803>] jbd2_journal_start+0x13/0x20
> [<ffffffff81266cde>] ext4_journal_start_sb+0x7e/0x2a0
> [<ffffffff81252907>] ext4_unlink+0x67/0x4b0
> [<ffffffff811c9bdf>] vfs_unlink+0x9f/0x110
> [<ffffffff811ccf43>] do_unlinkat+0x183/0x1c0
> [<ffffffff811cda82>] sys_unlinkat+0x22/0x40
> [<ffffffff816abc29>] system_call_fastpath+0x16/0x1b
> SOFTIRQ-ON-W at:
> [<ffffffff810cbf98>] __lock_acquire+0x648/0x1c20
> [<ffffffff810cdc5d>] lock_acquire+0x9d/0x200
> [<ffffffff8128b486>] start_this_handle+0x536/0x700
> [<ffffffff8128b77a>] jbd2__journal_start+0x12a/0x1a0
> [<ffffffff8128b803>] jbd2_journal_start+0x13/0x20
> [<ffffffff81266cde>] ext4_journal_start_sb+0x7e/0x2a0
> [<ffffffff81252907>] ext4_unlink+0x67/0x4b0
> [<ffffffff811c9bdf>] vfs_unlink+0x9f/0x110
> [<ffffffff811ccf43>] do_unlinkat+0x183/0x1c0
> [<ffffffff811cda82>] sys_unlinkat+0x22/0x40
> [<ffffffff816abc29>] system_call_fastpath+0x16/0x1b
> IN-RECLAIM_FS-W at:
> [<ffffffff810cbee0>] __lock_acquire+0x590/0x1c20
> [<ffffffff810cdc5d>] lock_acquire+0x9d/0x200
> [<ffffffff8128b486>] start_this_handle+0x536/0x700
> [<ffffffff8128b77a>] jbd2__journal_start+0x12a/0x1a0
> [<ffffffff8128b803>] jbd2_journal_start+0x13/0x20
> [<ffffffff81266cde>] ext4_journal_start_sb+0x7e/0x2a0
> [<ffffffff8124bfb9>] ext4_evict_inode+0x1a9/0x620
> [<ffffffff811d91d3>] evict+0xa3/0x1b0
> [<ffffffff811d93e5>] iput+0x105/0x200
> [<ffffffff811d3bb8>] dentry_iput+0xa8/0x100
> [<ffffffff811d53a0>] shrink_dentry_list+0x280/0x4c0
> [<ffffffff811d64eb>] prune_dcache_sb+0x15b/0x190
> [<ffffffff811bf7d0>] prune_super+0x130/0x1a0
> [<ffffffff81163185>] shrink_slab+0x175/0x4b0
> [<ffffffff8116762a>] balance_pgdat+0x52a/0x720
> [<ffffffff811679c1>] kswapd+0x1a1/0x5b0
> [<ffffffff8108b927>] kthread+0xb7/0xc0
> [<ffffffff816ad074>] kernel_thread_helper+0x4/0x10
> INITIAL USE at:
> [<ffffffff810cbc70>] __lock_acquire+0x320/0x1c20
> [<ffffffff810cdc5d>] lock_acquire+0x9d/0x200
> [<ffffffff8128b486>] start_this_handle+0x536/0x700
> [<ffffffff8128b77a>] jbd2__journal_start+0x12a/0x1a0
> [<ffffffff8128b803>] jbd2_journal_start+0x13/0x20
> [<ffffffff81266cde>] ext4_journal_start_sb+0x7e/0x2a0
> [<ffffffff81252907>] ext4_unlink+0x67/0x4b0
> [<ffffffff811c9bdf>] vfs_unlink+0x9f/0x110
> [<ffffffff811ccf43>] do_unlinkat+0x183/0x1c0
> [<ffffffff811cda82>] sys_unlinkat+0x22/0x40
> [<ffffffff816abc29>] system_call_fastpath+0x16/0x1b
> }
> ... key at: [<ffffffff829cff00>] jbd2_handle_key+0x0/0x8
> ... acquired at:
> [<ffffffff810cae1b>] check_usage_forwards+0x11b/0x150
> [<ffffffff810cb7f8>] mark_lock+0x198/0x2f0
> [<ffffffff810cbee0>] __lock_acquire+0x590/0x1c20
> [<ffffffff810cdc5d>] lock_acquire+0x9d/0x200
> [<ffffffff8128b486>] start_this_handle+0x536/0x700
> [<ffffffff8128b77a>] jbd2__journal_start+0x12a/0x1a0
> [<ffffffff8128b803>] jbd2_journal_start+0x13/0x20
> [<ffffffff81266cde>] ext4_journal_start_sb+0x7e/0x2a0
> [<ffffffff8124bfb9>] ext4_evict_inode+0x1a9/0x620
> [<ffffffff811d91d3>] evict+0xa3/0x1b0
> [<ffffffff811d93e5>] iput+0x105/0x200
> [<ffffffff811d3bb8>] dentry_iput+0xa8/0x100
> [<ffffffff811d53a0>] shrink_dentry_list+0x280/0x4c0
> [<ffffffff811d64eb>] prune_dcache_sb+0x15b/0x190
> [<ffffffff811bf7d0>] prune_super+0x130/0x1a0
> [<ffffffff81163185>] shrink_slab+0x175/0x4b0
> [<ffffffff8116762a>] balance_pgdat+0x52a/0x720
> [<ffffffff811679c1>] kswapd+0x1a1/0x5b0
> [<ffffffff8108b927>] kthread+0xb7/0xc0
> [<ffffffff816ad074>] kernel_thread_helper+0x4/0x10
>
>
> stack backtrace:
> Pid: 37, comm: kswapd0 Not tainted 3.3.7-1.fc16.x86_64.debug #1
> Call Trace:
> [<ffffffff810cacf8>] print_irq_inversion_bug.part.19+0x1e8/0x1f0
> [<ffffffff810cae1b>] check_usage_forwards+0x11b/0x150
> [<ffffffff810cb7f8>] mark_lock+0x198/0x2f0
> [<ffffffff810cad00>] ? print_irq_inversion_bug.part.19+0x1f0/0x1f0
> [<ffffffff810cbee0>] __lock_acquire+0x590/0x1c20
> [<ffffffff8128b6d9>] ? jbd2__journal_start+0x89/0x1a0
> [<ffffffff81022023>] ? native_sched_clock+0x13/0x80
> [<ffffffff810a3dc5>] ? sched_clock_local+0x25/0x90
> [<ffffffff810a3f58>] ? sched_clock_cpu+0xa8/0x110
> [<ffffffff810c815d>] ? trace_hardirqs_off+0xd/0x10
> [<ffffffff810cdc5d>] lock_acquire+0x9d/0x200
> [<ffffffff8128b457>] ? start_this_handle+0x507/0x700
> [<ffffffff8128b486>] start_this_handle+0x536/0x700
> [<ffffffff8128b457>] ? start_this_handle+0x507/0x700
> [<ffffffff811a1c2b>] ? kmem_cache_alloc+0x19b/0x280
> [<ffffffff8128b6d9>] ? jbd2__journal_start+0x89/0x1a0
> [<ffffffff8128b77a>] jbd2__journal_start+0x12a/0x1a0
> [<ffffffff8124bfb9>] ? ext4_evict_inode+0x1a9/0x620
> [<ffffffff8128b803>] jbd2_journal_start+0x13/0x20
> [<ffffffff81266cde>] ext4_journal_start_sb+0x7e/0x2a0
> [<ffffffff8121ec90>] ? __dquot_initialize+0x30/0x180
> [<ffffffff811d91c1>] ? evict+0x91/0x1b0
> [<ffffffff8124bfb9>] ext4_evict_inode+0x1a9/0x620
> [<ffffffff811d91d3>] evict+0xa3/0x1b0
> [<ffffffff811d93e5>] iput+0x105/0x200
> [<ffffffff811d3bb8>] dentry_iput+0xa8/0x100
> [<ffffffff811d53a0>] shrink_dentry_list+0x280/0x4c0
> [<ffffffff811d53d0>] ? shrink_dentry_list+0x2b0/0x4c0
> [<ffffffff811d64eb>] prune_dcache_sb+0x15b/0x190
> [<ffffffff811bf7d0>] prune_super+0x130/0x1a0
> [<ffffffff81163185>] shrink_slab+0x175/0x4b0
> [<ffffffff811ae776>] ? mem_cgroup_iter+0xf6/0x340
> [<ffffffff8116762a>] balance_pgdat+0x52a/0x720
> [<ffffffff811679c1>] kswapd+0x1a1/0x5b0
> [<ffffffff8108c580>] ? __init_waitqueue_head+0x60/0x60
> [<ffffffff81167820>] ? balance_pgdat+0x720/0x720
> [<ffffffff8108b927>] kthread+0xb7/0xc0
> [<ffffffff816ad074>] kernel_thread_helper+0x4/0x10
> [<ffffffff816a3374>] ? retint_restore_args+0x13/0x13
> [<ffffffff8108b870>] ? __init_kthread_worker+0x70/0x70
> [<ffffffff816ad070>] ? gs_change+0x13/0x13
>
> --
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--
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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