Date:	Mon, 26 Sep 2011 10:40:16 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [BUG] INFO: inconsistent lock state

On Tue, 2011-09-20 at 14:46 +0530, Srivatsa S. Bhat wrote:
> While running kernel compilation along with suspend/resume
> tests using the pm_test framework (at the processors level),
> lockdep reports inconsistent lock state.
> This is with Kernel 3.0.4.

Something very similar happened to be in the logs of a machine running
v3.0.4 too. It happened a few days ago (but I missed it initially). I
have no idea what triggered this:

kernel: [ 3501.569697] 
kernel: [ 3501.569699] =================================
kernel: [ 3501.569703] [ INFO: inconsistent lock state ]
kernel: [ 3501.569706] 3.0.4-local0.fc14.x86_64 #1
kernel: [ 3501.569708] ---------------------------------
kernel: [ 3501.569711] inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage.
kernel: [ 3501.569714] kswapd0/25 [HC0[0]:SC0[0]:HE1:SE1] takes:
kernel: [ 3501.569717]  (&sb->s_type->i_mutex_key#13){+.+.?.}, at: [<ffffffff811b08eb>] ext4_evict_inode+0x41/0x255
kernel: [ 3501.569728] {RECLAIM_FS-ON-W} state was registered at:
kernel: [ 3501.569730]   [<ffffffff8108fcd1>] mark_held_locks+0x50/0x72
kernel: [ 3501.569736]   [<ffffffff81090273>] lockdep_trace_alloc+0xa2/0xc6
kernel: [ 3501.569740]   [<ffffffff811302da>] slab_pre_alloc_hook+0x1e/0x54
kernel: [ 3501.569745]   [<ffffffff81132f3d>] kmem_cache_alloc+0x25/0x105
kernel: [ 3501.569749]   [<ffffffff81155a26>] d_alloc+0x27/0x1b3
kernel: [ 3501.569754]   [<ffffffff8114c785>] d_alloc_and_lookup+0x2c/0x6d
kernel: [ 3501.569758]   [<ffffffff8114db93>] walk_component+0x1ea/0x3da
kernel: [ 3501.569762]   [<ffffffff8114eda2>] link_path_walk+0x18a/0x477
kernel: [ 3501.569766]   [<ffffffff8114f1a5>] path_lookupat+0x59/0x34b
kernel: [ 3501.569770]   [<ffffffff8114f4c1>] do_path_lookup+0x2a/0x99
kernel: [ 3501.569774]   [<ffffffff8114f8fb>] user_path_at+0x56/0x93
kernel: [ 3501.569778]   [<ffffffff81147227>] vfs_fstatat+0x49/0x74
kernel: [ 3501.569782]   [<ffffffff8114728d>] vfs_stat+0x1b/0x1d
kernel: [ 3501.569786]   [<ffffffff811473a3>] sys_newstat+0x1f/0x39
kernel: [ 3501.569790]   [<ffffffff814f62c2>] system_call_fastpath+0x16/0x1b
kernel: [ 3501.569796] irq event stamp: 2656001
kernel: [ 3501.569798] hardirqs last  enabled at (2656001): [<ffffffff814efa54>] restore_args+0x0/0x30
kernel: [ 3501.569803] hardirqs last disabled at (2655999): [<ffffffff810632a8>] __do_softirq+0x15c/0x1ed
kernel: [ 3501.569809] softirqs last  enabled at (2656000): [<ffffffff810632df>] __do_softirq+0x193/0x1ed
kernel: [ 3501.569813] softirqs last disabled at (2654505): [<ffffffff814f755c>] call_softirq+0x1c/0x30
kernel: [ 3501.569818] 
kernel: [ 3501.569819] other info that might help us debug this:
kernel: [ 3501.569821]  Possible unsafe locking scenario:
kernel: [ 3501.569822] 
kernel: [ 3501.569824]        CPU0
kernel: [ 3501.569826]        ----
kernel: [ 3501.569827]   lock(&sb->s_type->i_mutex_key);
kernel: [ 3501.569831]   <Interrupt>
kernel: [ 3501.569833]     lock(&sb->s_type->i_mutex_key);
kernel: [ 3501.569836] 
kernel: [ 3501.569837]  *** DEADLOCK ***
kernel: [ 3501.569837] 
kernel: [ 3501.569840] 2 locks held by kswapd0/25:
kernel: [ 3501.569842]  #0:  (shrinker_rwsem){++++..}, at: [<ffffffff81101fc9>] shrink_slab+0x3d/0x189
kernel: [ 3501.569850]  #1:  (iprune_sem){++++.-}, at: [<ffffffff81158be2>] shrink_icache_memory+0x50/0x288
kernel: [ 3501.569857] 
kernel: [ 3501.569858] stack backtrace:
kernel: [ 3501.569861] Pid: 25, comm: kswapd0 Not tainted 3.0.4-local0.fc14.x86_64 #1
kernel: [ 3501.569863] Call Trace:
kernel: [ 3501.569868]  [<ffffffff8108e538>] valid_state+0x215/0x227
kernel: [ 3501.569873]  [<ffffffff8108dd2e>] ? print_irq_inversion_bug+0x1c4/0x1c4
kernel: [ 3501.569876]  [<ffffffff8108e62c>] mark_lock+0xe2/0x1d8
kernel: [ 3501.569880]  [<ffffffff8108eafc>] __lock_acquire+0x3da/0xdd8
kernel: [ 3501.569885]  [<ffffffff8108fcd1>] ? mark_held_locks+0x50/0x72
kernel: [ 3501.569889]  [<ffffffff814efa54>] ? retint_restore_args+0x13/0x13
kernel: [ 3501.569892]  [<ffffffff81158869>] ? evict+0x4f/0x127
kernel: [ 3501.569896]  [<ffffffff8108fdfe>] ? trace_hardirqs_on_caller+0x10b/0x12f
kernel: [ 3501.569900]  [<ffffffff811b08eb>] ? ext4_evict_inode+0x41/0x255
kernel: [ 3501.569904]  [<ffffffff8108f9c6>] lock_acquire+0xb7/0xfb
kernel: [ 3501.569908]  [<ffffffff811b08eb>] ? ext4_evict_inode+0x41/0x255
kernel: [ 3501.569912]  [<ffffffff811b08eb>] ? ext4_evict_inode+0x41/0x255
kernel: [ 3501.569916]  [<ffffffff814edb1f>] __mutex_lock_common+0x4c/0x361
kernel: [ 3501.569920]  [<ffffffff811b08eb>] ? ext4_evict_inode+0x41/0x255
kernel: [ 3501.569924]  [<ffffffff8108be8d>] ? trace_hardirqs_off+0xd/0xf
kernel: [ 3501.569928]  [<ffffffff810802da>] ? local_clock+0x36/0x4d
kernel: [ 3501.569932]  [<ffffffff8108c123>] ? lock_release_holdtime+0x54/0x5b
kernel: [ 3501.569936]  [<ffffffff814edf43>] mutex_lock_nested+0x40/0x45
kernel: [ 3501.569940]  [<ffffffff811b08eb>] ext4_evict_inode+0x41/0x255
kernel: [ 3501.569944]  [<ffffffff81158899>] evict+0x7f/0x127
kernel: [ 3501.569947]  [<ffffffff8115897f>] dispose_list+0x3e/0x50
kernel: [ 3501.569951]  [<ffffffff81158dea>] shrink_icache_memory+0x258/0x288
kernel: [ 3501.569955]  [<ffffffff81101fc9>] ? shrink_slab+0x3d/0x189
kernel: [ 3501.569958]  [<ffffffff8110207e>] shrink_slab+0xf2/0x189
kernel: [ 3501.569962]  [<ffffffff81104995>] balance_pgdat+0x2f7/0x5d3
kernel: [ 3501.569967]  [<ffffffff81104f3f>] kswapd+0x2ce/0x314
kernel: [ 3501.569971]  [<ffffffff8107a76a>] ? wake_up_bit+0x2a/0x2a
kernel: [ 3501.569975]  [<ffffffff81104c71>] ? balance_pgdat+0x5d3/0x5d3
kernel: [ 3501.569978]  [<ffffffff8107a25c>] kthread+0xa0/0xa8
kernel: [ 3501.569983]  [<ffffffff8108fdfe>] ? trace_hardirqs_on_caller+0x10b/0x12f
kernel: [ 3501.569987]  [<ffffffff814f7464>] kernel_thread_helper+0x4/0x10
kernel: [ 3501.569991]  [<ffffffff814efa54>] ? retint_restore_args+0x13/0x13
kernel: [ 3501.569995]  [<ffffffff8107a1bc>] ? __init_kthread_worker+0x5b/0x5b
kernel: [ 3501.569999]  [<ffffffff814f7460>] ? gs_change+0x13/0x13


Paul Bolle

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