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SubjectRe: 2.6.24-rc2 XFS nfsd hang
From
On Wed, Nov 14, 2007 at 09:43:40AM +0200, Benny Halevy wrote:
> I wonder if this is a similar hang to what Christian was seeing here:
> http://lkml.org/lkml/2007/11/13/319

Ah, thanks for noticing that. Christian Kujau, is /data an xfs
partition? There are a bunch of xfs commits in

^92d15c2ccbb3e31a3fc71ad28fdb55e1319383c0
^291702f017efdfe556cb87b8530eb7d1ff08cbae
^1d677a6dfaac1d1cf51a7f58847077240985faf2
^fba956c46a72f9e7503fd464ffee43c632307e31
^bbf25010f1a6b761914430f5fca081ec8c7accd1
6e800af233e0bdf108efb7bd23c11ea6fa34cdeb
7b1915a989ea4d426d0fd98974ab80f30ef1d779
c223701cf6c706f42840631c1ca919a18e6e2800
f77bf01425b11947eeb3b5b54685212c302741b8

which was the range remaining for him to bisect.

--b.

>
> Benny
>
> On Nov. 14, 2007, 9:04 +0200, Chris Wedgwood <cw@f00f.org> 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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> >
>
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