On Thu, Jan 08, 2009 at 03:57:30PM +0100, Peter Zijlstra wrote:
> FWIW lockdep seems to warn about this...
>
> All I have to do to trigger this is boot the machine and let it sit for
> a few minutes.
Linus merged a fix (9a8d248e2d2 "nfsd: fix double-locks of directory
mutex") last night. If you still see warnings after that, let us know.
--b.
>
> [ 113.552497] =============================================
> [ 113.553289] [ INFO: possible recursive locking detected ]
> [ 113.553289] 2.6.28-tip #592
> [ 113.553289] ---------------------------------------------
> [ 113.553289] nfsd4/1914 is trying to acquire lock:
> [ 113.553289] (&type->i_mutex_dir_key#4){--..}, at: [<ffffffff802e7e5e>] vfs_fsync+0x6c/0xb1
> [ 113.553289]
> [ 113.553289] but task is already holding lock:
> [ 113.553289] (&type->i_mutex_dir_key#4){--..}, at: [<ffffffffa0190727>] nfsd4_sync_rec_dir+0x22/0x47 [nfsd]
> [ 113.553289]
> [ 113.553289] other info that might help us debug this:
> [ 113.553289] 4 locks held by nfsd4/1914:
> [ 113.553289] #0: (nfsd4){--..}, at: [<ffffffff80252303>] run_workqueue+0xb6/0x21b
> [ 113.553289] #1: ((laundromat_work).work){--..}, at: [<ffffffff80252303>] run_workqueue+0xb6/0x21b
> [ 113.553289] #2: (client_mutex){--..}, at: [<ffffffffa018bd05>] laundromat_main+0x33/0x24e [nfsd]
> [ 113.553289] #3: (&type->i_mutex_dir_key#4){--..}, at: [<ffffffffa0190727>] nfsd4_sync_rec_dir+0x22/0x47 [nfsd]
> [ 113.553289]
> [ 113.553289] stack backtrace:
> [ 113.553289] Pid: 1914, comm: nfsd4 Not tainted 2.6.28-tip #592
> [ 113.553289] Call Trace:
> [ 113.553289] [<ffffffff80266987>] __lock_acquire+0xe42/0x161a
> [ 113.553289] [<ffffffff80288857>] ? __call_rcu+0x7a/0x107
> [ 113.553289] [<ffffffff802671b4>] lock_acquire+0x55/0x71
> [ 113.553289] [<ffffffff802e7e5e>] ? vfs_fsync+0x6c/0xb1
> [ 113.553289] [<ffffffff805568d0>] mutex_lock_nested+0x4e/0x320
> [ 113.553289] [<ffffffff802e7e5e>] ? vfs_fsync+0x6c/0xb1
> [ 113.553289] [<ffffffff8029bde0>] ? __filemap_fdatawrite_range+0x57/0x5f
> [ 113.553289] [<ffffffff802e7e5e>] vfs_fsync+0x6c/0xb1
> [ 113.553289] [<ffffffffa0176f8f>] nfsd_sync_dir+0x15/0x17 [nfsd]
> [ 113.553289] [<ffffffffa0190733>] nfsd4_sync_rec_dir+0x2e/0x47 [nfsd]
> [ 113.553289] [<ffffffffa0190791>] nfsd4_recdir_purge_old+0x45/0x73 [nfsd]
> [ 113.553289] [<ffffffffa018bd44>] laundromat_main+0x72/0x24e [nfsd]
> [ 113.553289] [<ffffffff80252355>] run_workqueue+0x108/0x21b
> [ 113.553289] [<ffffffff80252303>] ? run_workqueue+0xb6/0x21b
> [ 113.553289] [<ffffffffa018bcd2>] ? laundromat_main+0x0/0x24e [nfsd]
> [ 113.553289] [<ffffffff8025254d>] worker_thread+0xe5/0xf6
> [ 113.553289] [<ffffffff80256615>] ? autoremove_wake_function+0x0/0x3d
> [ 113.553289] [<ffffffff80252468>] ? worker_thread+0x0/0xf6
> [ 113.553289] [<ffffffff80256200>] kthread+0x4e/0x7b
> [ 113.553289] [<ffffffff8020d51a>] child_rip+0xa/0x20
> [ 113.553289] [<ffffffff8020cec0>] ? restore_args+0x0/0x30
> [ 113.553289] [<ffffffff802561b2>] ? kthread+0x0/0x7b
> [ 113.553289] [<ffffffff8020d510>] ? child_rip+0x0/0x20
>
>
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