linux-kernel - [bug] as_merged_requests(): possible recursive locking detected

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Date:	Thu, 31 Jan 2008 23:14:36 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [bug] as_merged_requests(): possible recursive locking detected



Jens,

AS still has some locking issues - see the lockdep warning below that 
the x86 test-rig just triggered. Config attached. Never saw this one 
before. Can send more info if needed.

	Ingo

---------->
udev: renamed network interface eth0_rename to eth1

=============================================
[ INFO: possible recursive locking detected ]
2.6.24 #183
---------------------------------------------
vol_id/1769 is trying to acquire lock:
 (&ret->lock#2){.+..}, at: [<ffffffff8047afee>] as_merged_requests+0xa7/0x110

but task is already holding lock:
 (&ret->lock#2){.+..}, at: [<ffffffff8047afe6>] as_merged_requests+0x9f/0x110

other info that might help us debug this:
2 locks held by vol_id/1769:
 #0:  (&q->__queue_lock){.+..}, at: [<ffffffff80473ffb>] __make_request+0x5f/0x3fd
 #1:  (&ret->lock#2){.+..}, at: [<ffffffff8047afe6>] as_merged_requests+0x9f/0x110

stack backtrace:
Pid: 1769, comm: vol_id Not tainted 2.6.24 #183

Call Trace:
 [<ffffffff8024f2b9>] print_deadlock_bug+0xcb/0xd6
 [<ffffffff8024f314>] check_deadlock+0x50/0x60
 [<ffffffff80250c41>] validate_chain+0x1ed/0x289
 [<ffffffff80251224>] __lock_acquire+0x547/0x608
 [<ffffffff8047afee>] ? as_merged_requests+0xa7/0x110
 [<ffffffff8025137e>] lock_acquire+0x99/0xc6
 [<ffffffff8047afee>] ? as_merged_requests+0xa7/0x110
 [<ffffffff8090004e>] _spin_lock+0x34/0x41
 [<ffffffff8047afee>] as_merged_requests+0xa7/0x110
 [<ffffffff80471184>] elv_merge_requests+0x28/0x51
 [<ffffffff80476c1b>] attempt_merge+0xf5/0x14b
 [<ffffffff80476cc4>] attempt_back_merge+0x27/0x30
 [<ffffffff8047411c>] __make_request+0x180/0x3fd
 [<ffffffff80472fb0>] generic_make_request+0x355/0x390
 [<ffffffff802ac5ed>] ? create_empty_buffers+0xa0/0xa9
 [<ffffffff804744ff>] submit_bio+0xfe/0x107
 [<ffffffff802abfc4>] submit_bh+0xe7/0x10b
 [<ffffffff802aefcd>] block_read_full_page+0x289/0x2a5
 [<ffffffff802b1d7f>] ? blkdev_get_block+0x0/0x4c
 [<ffffffff80268422>] ? add_to_page_cache+0xa1/0xd3
 [<ffffffff802b0ef7>] blkdev_readpage+0x13/0x15
 [<ffffffff8026f3fb>] read_pages+0x81/0xa1
 [<ffffffff8026f5b0>] __do_page_cache_readahead+0x195/0x1b8
 [<ffffffff80267fda>] ? find_get_page+0x58/0x64
 [<ffffffff8026f7f4>] ondemand_readahead+0xa1/0x155
 [<ffffffff8026f93b>] page_cache_sync_readahead+0x17/0x19
 [<ffffffff80268c3f>] do_generic_mapping_read+0xa8/0x372
 [<ffffffff80267d32>] ? file_read_actor+0x0/0x1ac
 [<ffffffff80269f94>] generic_file_aio_read+0x125/0x164
 [<ffffffff8028b9cc>] do_sync_read+0xeb/0x132
 [<ffffffff80250416>] ? mark_held_locks+0x59/0x75
 [<ffffffff8024549f>] ? autoremove_wake_function+0x0/0x38
 [<ffffffff802515f9>] ? __lock_release+0x5b/0x64
 [<ffffffff808fee67>] ? mutex_unlock+0x9/0xb
 [<ffffffff808fee33>] ? __mutex_unlock_slowpath+0x10e/0x139
 [<ffffffff802505d7>] ? trace_hardirqs_on+0xfe/0x128
 [<ffffffff8028c0c4>] vfs_read+0xa4/0xe3
 [<ffffffff8028c440>] sys_read+0x47/0x6f
 [<ffffffff8020c10a>] system_call_after_swapgs+0x8a/0x8f

eth0: link down
ADDRCONF(NETDEV_UP): eth0: link is not ready
Adding 3911816k swap on /dev/sda2.  Priority:-1 extents:1 across:3911816k
rc.sysinit used greatest stack depth: 3512 bytes left
device: 'vcs1': device_add

View attachment "config" of type "text/plain" (53673 bytes)