Re: 2.6.24-rc2 XFS nfsd hang

From: Benny Halevy
Date: Wed Nov 14 2007 - 02:43:58 EST

I wonder if this is a similar hang to what Christian was seeing here:
http://lkml.org/lkml/2007/11/13/319

Benny

On Nov. 14, 2007, 9:04 +0200, Chris Wedgwood <cw@xxxxxxxx> wrote:
> With 2.6.24-rc2 (amd64) I sometimes (usually but perhaps not always)
> see a hang when accessing some NFS exported XFS filesystems. Local
> access to these filesystems ahead of time works without problems.
>
> This does not occur with 2.6.23.1. The filesystem does not appear to
> be corrupt.
>
>
> The call chain for the wedged process is:
>
> [ 1462.911256] nfsd D ffffffff80547840 4760 2966 2
> [ 1462.911283] ffff81010414d4d0 0000000000000046 0000000000000000 ffff81010414d610
> [ 1462.911322] ffff810104cbc6e0 ffff81010414d480 ffffffff80746dc0 ffffffff80746dc0
> [ 1462.911360] ffffffff80744020 ffffffff80746dc0 ffff81010129c140 ffff8101000ad100
> [ 1462.911391] Call Trace:
> [ 1462.911417] [<ffffffff8052e638>] __down+0xe9/0x101
> [ 1462.911437] [<ffffffff8022cc80>] default_wake_function+0x0/0xe
> [ 1462.911458] [<ffffffff8052e275>] __down_failed+0x35/0x3a
> [ 1462.911480] [<ffffffff8035ac25>] _xfs_buf_find+0x84/0x24d
> [ 1462.911501] [<ffffffff8035ad34>] _xfs_buf_find+0x193/0x24d
> [ 1462.911522] [<ffffffff803599b1>] xfs_buf_lock+0x43/0x45
> [ 1462.911543] [<ffffffff8035ad5b>] _xfs_buf_find+0x1ba/0x24d
> [ 1462.911564] [<ffffffff8035ae48>] xfs_buf_get_flags+0x5a/0x14b
> [ 1462.911586] [<ffffffff8035b490>] xfs_buf_read_flags+0x12/0x86
> [ 1462.911607] [<ffffffff8034ecf6>] xfs_trans_read_buf+0x4c/0x2cf
> [ 1462.911629] [<ffffffff803292be>] xfs_da_do_buf+0x41b/0x65b
> [ 1462.911652] [<ffffffff80329568>] xfs_da_read_buf+0x24/0x29
> [ 1462.911673] [<ffffffff8032be40>] xfs_dir2_block_lookup_int+0x4d/0x1ab
> [ 1462.911694] [<ffffffff8032be40>] xfs_dir2_block_lookup_int+0x4d/0x1ab
> [ 1462.911717] [<ffffffff8032c718>] xfs_dir2_block_lookup+0x15/0x8e
> [ 1462.911738] [<ffffffff8032b8e1>] xfs_dir_lookup+0xd2/0x12c
> [ 1462.911761] [<ffffffff8036d658>] submit_bio+0x10d/0x114
> [ 1462.911781] [<ffffffff8034fb56>] xfs_dir_lookup_int+0x2c/0xc5
> [ 1462.911802] [<ffffffff802507a2>] lockdep_init_map+0x90/0x495
> [ 1462.911823] [<ffffffff80353436>] xfs_lookup+0x44/0x6f
> [ 1462.911843] [<ffffffff8035e364>] xfs_vn_lookup+0x29/0x60
> [ 1462.915246] [<ffffffff8028856c>] __lookup_hash+0xe5/0x109
> [ 1462.915267] [<ffffffff802893dd>] lookup_one_len+0x41/0x4e
> [ 1462.915289] [<ffffffff80303d05>] compose_entry_fh+0xc1/0x117
> [ 1462.915311] [<ffffffff80303f4c>] encode_entry+0x17c/0x38b
> [ 1462.915333] [<ffffffff80261e4e>] find_or_create_page+0x3f/0xc9
> [ 1462.915355] [<ffffffff8035a2c0>] _xfs_buf_lookup_pages+0x2c1/0x2f6
> [ 1462.915377] [<ffffffff8052ec6b>] _spin_unlock+0x1f/0x49
> [ 1462.915399] [<ffffffff8027e632>] cache_alloc_refill+0x1ba/0x4b9
> [ 1462.915424] [<ffffffff8030415b>] nfs3svc_encode_entry_plus+0x0/0x13
> [ 1462.915448] [<ffffffff8030416b>] nfs3svc_encode_entry_plus+0x10/0x13
> [ 1462.915469] [<ffffffff8032c67c>] xfs_dir2_block_getdents+0x15b/0x1e2
> [ 1462.915491] [<ffffffff8030415b>] nfs3svc_encode_entry_plus+0x0/0x13
> [ 1462.915514] [<ffffffff8030415b>] nfs3svc_encode_entry_plus+0x0/0x13
> [ 1462.915534] [<ffffffff8032b6da>] xfs_readdir+0x91/0xb6
> [ 1462.915557] [<ffffffff8030415b>] nfs3svc_encode_entry_plus+0x0/0x13
> [ 1462.915579] [<ffffffff8035be9d>] xfs_file_readdir+0x31/0x40
> [ 1462.915599] [<ffffffff8028c9f8>] vfs_readdir+0x61/0x93
> [ 1462.915619] [<ffffffff8030415b>] nfs3svc_encode_entry_plus+0x0/0x13
> [ 1462.915642] [<ffffffff802fc78e>] nfsd_readdir+0x6d/0xc5
> [ 1462.915663] [<ffffffff80303158>] nfsd3_proc_readdirplus+0x114/0x204
> [ 1462.915686] [<ffffffff802f8b82>] nfsd_dispatch+0xde/0x1b6
> [ 1462.915706] [<ffffffff805215cd>] svc_process+0x3f8/0x717
> [ 1462.915729] [<ffffffff802f9148>] nfsd+0x1a9/0x2c1
> [ 1462.915749] [<ffffffff8020c648>] child_rip+0xa/0x12
> [ 1462.915769] [<ffffffff80520af8>] __svc_create_thread+0xea/0x1eb
> [ 1462.915792] [<ffffffff802f8f9f>] nfsd+0x0/0x2c1
> [ 1462.915812] [<ffffffff8020c63e>] child_rip+0x0/0x12
>
> Over time other processes pile up beind this.
>
> [ 1462.910728] nfsd D ffffffffffffffff 5440 2965 2
> [ 1462.910769] ffff8101040cdd40 0000000000000046 0000000000000001 ffff810103471900
> [ 1462.910812] ffff8101029a72c0 ffff8101040cdcf0 ffffffff80746dc0 ffffffff80746dc0
> [ 1462.910852] ffffffff80744020 ffffffff80746dc0 ffff81010008e0c0 ffff8101012a1040
> [ 1462.910882] Call Trace:
> [ 1462.910909] [<ffffffff802fbadf>] nfsd_permission+0x95/0xeb
> [ 1462.910931] [<ffffffff8028c9dd>] vfs_readdir+0x46/0x93
> [ 1462.910950] [<ffffffff8052d729>] mutex_lock_nested+0x165/0x27c
> [ 1462.910971] [<ffffffff8052ec6b>] _spin_unlock+0x1f/0x49
> [ 1462.910994] [<ffffffff8030415b>] nfs3svc_encode_entry_plus+0x0/0x13
> [ 1462.911015] [<ffffffff8028c9dd>] vfs_readdir+0x46/0x93
> [ 1462.911037] [<ffffffff8030415b>] nfs3svc_encode_entry_plus+0x0/0x13
> [ 1462.911057] [<ffffffff802fc78e>] nfsd_readdir+0x6d/0xc5
> [ 1462.911079] [<ffffffff80303158>] nfsd3_proc_readdirplus+0x114/0x204
> [ 1462.911102] [<ffffffff802f8b82>] nfsd_dispatch+0xde/0x1b6
> [ 1462.911122] [<ffffffff805215cd>] svc_process+0x3f8/0x717
> [ 1462.911143] [<ffffffff802f9148>] nfsd+0x1a9/0x2c1
> [ 1462.911165] [<ffffffff8020c648>] child_rip+0xa/0x12
> [ 1462.911184] [<ffffffff80520af8>] __svc_create_thread+0xea/0x1eb
> [ 1462.911206] [<ffffffff802f8f9f>] nfsd+0x0/0x2c1
> [ 1462.911225] [<ffffffff8020c63e>] child_rip+0x0/0x12
>
>
> Any suggestions other than to bisect this? (Bisection might be
> painful as it crosses the x86-merge.)
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