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Message-ID: <20091218115843.GB7728@osiris.boeblingen.de.ibm.com>
Date: Fri, 18 Dec 2009 12:58:43 +0100
From: Heiko Carstens <heiko.carstens@...ibm.com>
To: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc: Pekka Enberg <penberg@...helsinki.fi>
Subject: [2.6.33-rc1] slab: possible recursive locking detected
Just got this with CONFIG_SLAB:
=============================================
[ INFO: possible recursive locking detected ]
2.6.33-rc1-dirty #23
---------------------------------------------
events/5/20 is trying to acquire lock:
(&(&parent->list_lock)->rlock){..-...}, at: [<00000000000ee898>] cache_flusharray+0x3c/0x12c
but task is already holding lock:
(&(&parent->list_lock)->rlock){..-...}, at: [<00000000000eee52>] drain_array+0x52/0x100
other info that might help us debug this:
4 locks held by events/5/20:
#0: (events){+.+.+.}, at: [<000000000006cbec>] worker_thread+0x1ec/0x33c
#1: ((&(reap_work)->work)){+.+...}, at: [<000000000006cbec>] worker_thread+0x1ec/0x33c
#2: (cache_chain_mutex){+.+.+.}, at: [<00000000000ef03a>] cache_reap+0x32/0x164
#3: (&(&parent->list_lock)->rlock){..-...}, at: [<00000000000eee52>] drain_array+0x52/0x100
stack backtrace:
CPU: 5 Not tainted 2.6.33-rc1-dirty #23
Process events/5 (pid: 20, task: 000000003fa48a38, ksp: 000000003fa4fc60)
000000003fa4f9b0 000000003fa4f930 0000000000000002 0000000000000000
000000003fa4f9d0 000000003fa4f948 000000003fa4f948 00000000003dce2a
0000000000000000 0000000000000000 000000003fa49190 0000000000827108
000000000000000d 000000000000000c 000000003fa4f998 0000000000000000
0000000000000000 00000000000174fa 000000003fa4f930 000000003fa4f970
Call Trace:
([<0000000000017402>] show_trace+0xee/0x144)
[<0000000000088f88>] validate_chain+0xa2c/0x1100
[<0000000000089b70>] __lock_acquire+0x514/0xc4c
[<000000000008a354>] lock_acquire+0xac/0xd4
[<00000000003e0c68>] _raw_spin_lock+0x58/0x94
[<00000000000ee898>] cache_flusharray+0x3c/0x12c
[<00000000000eebd8>] kmem_cache_free+0xd4/0xf8
[<00000000000eeda4>] free_block+0x11c/0x178
[<00000000000eee92>] drain_array+0x92/0x100
[<00000000000ef0fe>] cache_reap+0xf6/0x164
[<000000000006cc6e>] worker_thread+0x26e/0x33c
[<0000000000072d14>] kthread+0xa0/0xa8
[<000000000001c10a>] kernel_thread_starter+0x6/0xc
[<000000000001c104>] kernel_thread_starter+0x0/0xc
INFO: lockdep is turned off.
config attached.
View attachment "config" of type "text/plain" (23957 bytes)
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