linux-kernel - Re: next-20090211: BUG: MAX_LOCKDEP

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Date:	Wed, 11 Feb 2009 14:04:27 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexander Beregalov <a.beregalov@...il.com>
Cc:	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Chris Mason <chris.mason@...cle.com>
Subject: Re: next-20090211: BUG: MAX_LOCKDEP_SUBCLASSES too low!

On Wed, 2009-02-11 at 15:52 +0300, Alexander Beregalov wrote:
> 2009/2/11 Peter Zijlstra <peterz@...radead.org>:
> > On Wed, 2009-02-11 at 13:24 +0100, Peter Zijlstra wrote:
> >> On Wed, 2009-02-11 at 13:23 +0100, Peter Zijlstra wrote:
> >> > On Wed, 2009-02-11 at 15:14 +0300, Alexander Beregalov wrote:
> >> > > Hi
> >> > >
> >> > > Full dmesg is attached.
> >> > >
> >> > > Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
> >> > > .... MAX_LOCKDEP_SUBCLASSES:  8
> >> > > .... MAX_LOCK_DEPTH:          48
> >> > > .... MAX_LOCKDEP_KEYS:        8191
> >> > > .... CLASSHASH_SIZE:          4096
> >> > > .... MAX_LOCKDEP_ENTRIES:     8192
> >> > > .... MAX_LOCKDEP_CHAINS:      16384
> >> > > .... CHAINHASH_SIZE:          8192
> >> > >  memory used by lock dependency info: 4351 kB
> >> > >  per task-struct memory footprint: 2688 bytes
> >> > > <..>
> >> > > BUG: MAX_LOCKDEP_SUBCLASSES too low!
> >> > > turning off the locking correctness validator.
> >> >
> >> > Is this an allyesconfig or something other massive bloated?
> >>
> >> Sorry, not playing attention, its SUB classes.. let me look at that,
> >> that smells like a rotten annotation.
> >
> > Could you run with the below patch, so that we can see where this
> > happens?

Tssk, Chris what you have been doing?

> BUG: MAX_LOCKDEP_SUBCLASSES too low!
> turning off the locking correctness validator.
> Pid: 2105, comm: btrfs-endio-wri Not tainted 2.6.29-rc4-next-20090211-dirty #2
> Call Trace:
>  [<ffffffff8026cbf9>] __lock_acquire+0x6b9/0x12c0
>  [<ffffffff8026d891>] lock_acquire+0x91/0xc0
>  [<ffffffff80447324>] ? btrfs_tree_lock+0xc4/0x160
>  [<ffffffff8062eb36>] _spin_lock_nested+0x46/0x80
>  [<ffffffff80447324>] ? btrfs_tree_lock+0xc4/0x160
>  [<ffffffff80447324>] btrfs_tree_lock+0xc4/0x160
>  [<ffffffff804471a0>] ? btrfs_wake_function+0x0/0x10
>  [<ffffffff8040bce6>] btrfs_init_new_buffer+0xa6/0x150
>  [<ffffffff80412fa1>] btrfs_alloc_free_block+0x81/0x90
>  [<ffffffff80402a16>] __btrfs_cow_block+0x7a6/0xb70
>  [<ffffffff804034e2>] btrfs_cow_block+0x112/0x2d0
>  [<ffffffff804072f3>] btrfs_search_slot+0x223/0xb00
>  [<ffffffff80235a99>] ? sub_preempt_count+0xa9/0xf0
>  [<ffffffff804178d1>] btrfs_lookup_csum+0x61/0x150
>  [<ffffffff8026c2ed>] ? trace_hardirqs_on+0xd/0x10
>  [<ffffffff80418356>] btrfs_csum_file_blocks+0xc6/0x7d0
>  [<ffffffff802c2315>] ? kmem_cache_free+0xb5/0x110
>  [<ffffffff802c2315>] ? kmem_cache_free+0xb5/0x110
>  [<ffffffff8026c2ed>] ? trace_hardirqs_on+0xd/0x10
>  [<ffffffff80437c76>] ? free_extent_state+0x46/0x70
>  [<ffffffff80439462>] ? clear_extent_bit+0xe2/0x2e0
>  [<ffffffff8042166a>] add_pending_csums+0x4a/0x70
>  [<ffffffff80422ac5>] btrfs_finish_ordered_io+0x115/0x1e0
>  [<ffffffff80422ba0>] btrfs_writepage_end_io_hook+0x10/0x20
>  [<ffffffff8043abf4>] end_bio_extent_writepage+0x104/0x1e0
>  [<ffffffff8026c282>] ? trace_hardirqs_on_caller+0x182/0x1e0
>  [<ffffffff802ef0cc>] bio_endio+0x1c/0x40
>  [<ffffffff8041b02b>] end_workqueue_fn+0xeb/0x120
>  [<ffffffff804446ea>] worker_loop+0x7a/0x1b0
>  [<ffffffff80444670>] ? worker_loop+0x0/0x1b0
>  [<ffffffff80259126>] kthread+0x56/0x90
>  [<ffffffff8020cc5a>] child_rip+0xa/0x20
>  [<ffffffff80235969>] ? finish_task_switch+0x89/0x110
>  [<ffffffff8062f546>] ? _spin_unlock_irq+0x36/0x60
>  [<ffffffff8020c640>] ? restore_args+0x0/0x30
>  [<ffffffff802590d0>] ? kthread+0x0/0x90
>  [<ffffffff8020cc50>] ? child_rip+0x0/0x20
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