From: Frederic Weisbecker <fweisbec@gmail.com>
To: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: reiserfs deadlock
Date: Sat, 6 Feb 2010 11:29:49 +0100 [thread overview]
Message-ID: <20100206102945.GA5062@nowhere> (raw)
In-Reply-To: <20100205093752.GA13441@orion>
On Fri, Feb 05, 2010 at 12:37:52PM +0300, Alexander Beregalov wrote:
> INFO: task nfsd:1741 blocked for more than 120 seconds.
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> nfsd D 38f62cfa 6636 1741 2 0x00000000
> f62d3c50 00000046 f62d3c30 38f62cfa 0000000b f6206b30 f62068b0 f62d3c90
> f62d3c58 f62d3c88 00000000 f62d3c90 f62d3c58 c10a4838 f62d3c74 c134dc75
> c10a4830 c27efab8 c27efab8 f6fbbf9c f62d3ca4 f62d3cb0 c134dd00 00000002
> Call Trace:
> [<c10a4838>] inode_wait+0x8/0x10
> [<c134dc75>] __wait_on_bit+0x45/0x70
> [<c10a4830>] ? inode_wait+0x0/0x10
> [<c134dd00>] out_of_line_wait_on_bit+0x60/0x70
> [<c10a4830>] ? inode_wait+0x0/0x10
> [<c103d530>] ? wake_bit_function+0x0/0x50
> [<c10a51dc>] ifind+0x8c/0xb0
> [<c10ea460>] ? reiserfs_find_actor+0x0/0x30
> [<c10a5f90>] iget5_locked+0x40/0x170
> [<c10ea460>] ? reiserfs_find_actor+0x0/0x30
> [<c10ec554>] reiserfs_iget+0x34/0xb0
> [<c10ea440>] ? reiserfs_init_locked_inode+0x0/0x20
> [<c10ec5f9>] reiserfs_get_dentry+0x29/0x70
> [<c1042c55>] ? sched_clock_cpu+0x95/0x110
> [<c10ec6cf>] reiserfs_fh_to_dentry+0x3f/0xb0
> [<c1128b85>] exportfs_decode_fh+0x35/0x200
> [<c134018c>] ? sunrpc_cache_lookup+0x5c/0x140
> [<c133fbc0>] ? cache_check+0x30/0x330
> [<c134018c>] ? sunrpc_cache_lookup+0x5c/0x140
> [<c108cab4>] ? slab_pad_check+0x34/0x120
> [<c11305fa>] ? exp_get_by_name+0x4a/0x70
> [<c134018c>] ? sunrpc_cache_lookup+0x5c/0x140
> [<c108ce74>] ? check_object+0xe4/0x200
> [<c108d470>] ? init_object+0x40/0x70
> [<c104e202>] ? mark_held_locks+0x62/0x90
> [<c108ed55>] ? kmem_cache_alloc+0xa5/0xf0
> [<c104e4c4>] ? trace_hardirqs_on_caller+0x124/0x170
> [<c104e51b>] ? trace_hardirqs_on+0xb/0x10
> [<c1042de2>] ? prepare_creds+0x22/0x50
> [<c1042de2>] ? prepare_creds+0x22/0x50
> [<c112c3a7>] fh_verify+0x2f7/0x580
> [<c112bf50>] ? nfsd_acceptable+0x0/0xf0
> [<c102ea21>] ? local_bh_enable_ip+0x61/0xc0
> [<c104e4c4>] ? trace_hardirqs_on_caller+0x124/0x170
> [<c13422ab>] ? svc_xprt_enqueue+0x7b/0x240
> [<c1135245>] nfsd3_proc_getattr+0x55/0xb0
> [<c1129055>] nfsd_dispatch+0x95/0x200
> [<c133697a>] svc_process+0x40a/0x730
> [<c1129654>] nfsd+0xa4/0x130
> [<c11295b0>] ? nfsd+0x0/0x130
> [<c103d1fc>] kthread+0x6c/0x80
> [<c103d190>] ? kthread+0x0/0x80
> [<c100303a>] kernel_thread_helper+0x6/0x1c
> 2 locks held by nfsd/1741:
> #0: (hash_sem){.+.+.+}, at: [<c1131a2d>] exp_readlock+0xd/0x10
> #1: (&REISERFS_SB(s)->lock){+.+.+.}, at: [<c1110f28>] reiserfs_write_lock+0x28/0x40
Yes! That must be the culprit. We are waiting for the inode to be
un-dirtied, but it can't since the writeback will need the reiserfs lock,
which we hold already.
Fine, I'll fix this, thanks a lot again for your report Alexander!
next prev parent reply other threads:[~2010-02-06 10:30 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-03 19:03 reiserfs deadlock Alexander Beregalov
2010-02-03 19:08 ` Alexander Beregalov
2010-02-03 20:29 ` Frederic Weisbecker
2010-02-03 22:43 ` Alexander Beregalov
2010-02-03 22:52 ` Frederic Weisbecker
2010-02-05 1:46 ` Alexander Beregalov
2010-02-05 3:59 ` Frederic Weisbecker
2010-02-05 9:37 ` Alexander Beregalov
2010-02-06 10:29 ` Frederic Weisbecker [this message]
2010-02-11 18:35 ` [PATCH] reiserfs: Fix softlockup while waiting on an inode Frederic Weisbecker
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