Public bug reported:
We do observe client hangs with NFS4 on the following occasions:
- a network outage
- a server outage
- an expiration of a kerberos ticket.
The Server is an SL 5.5 machine with latest kernel
We often see the following errors in /var/log/messages on the client:
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181453] chromium-brow D
0000000000000000 0 31737 31716 0x00000000
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181457] ffff88015b5bb8e8
0000000000000086 0000000000015bc0 0000000000015bc0
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181460] ffff880329cb5f38
ffff88015b5bbfd8 0000000000015bc0 ffff880329cb5b80
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181463] 0000000000015bc0
ffff88015b5bbfd8 0000000000015bc0 ffff880329cb5f38
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181466] Call Trace:
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181485] [<ffffffffa0d014c0>] ?
nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181491] [<ffffffff81541bc7>]
io_schedule+0x47/0x70
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181499] [<ffffffffa0d014ce>]
nfs_wait_bit_uninterruptible+0xe/0x20 [nfs]
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181502] [<ffffffff8154242f>]
__wait_on_bit+0x5f/0x90
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181510] [<ffffffffa0d014c0>] ?
nfs_wait_bit_uninterruptible+0x0/0x20 [nfs]
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181513] [<ffffffff815424d8>]
out_of_line_wait_on_bit+0x78/0x90
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181517] [<ffffffff810845b0>] ?
wake_bit_function+0x0/0x40
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181524] [<ffffffffa0d014af>]
nfs_wait_on_request+0x2f/0x40 [nfs]
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181534] [<ffffffffa0d07226>]
nfs_try_to_update_request+0xb6/0x160 [nfs]
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181543] [<ffffffffa0d0730d>]
nfs_writepage_setup+0x3d/0x1e0 [nfs]
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181551] [<ffffffffa0d07544>]
nfs_updatepage+0x94/0x1a0 [nfs]
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181556] [<ffffffff8113b9f1>] ?
mem_cgroup_add_lru_list+0x21/0xa0
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181563] [<ffffffffa0cf6eaa>]
nfs_write_end+0x5a/0x2c0 [nfs]
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181567] [<ffffffff810f3422>]
generic_perform_write+0x122/0x1d0
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181570] [<ffffffff810f4553>]
generic_file_buffered_write+0x73/0xd0
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181573] [<ffffffff810f5b00>]
__generic_file_aio_write+0x240/0x470
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181576] [<ffffffff810f5d9f>]
generic_file_aio_write+0x6f/0xe0
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181582] [<ffffffffa0cf6a0a>]
nfs_file_write+0xda/0x1e0 [nfs]
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181585] [<ffffffff81142f7a>]
do_sync_write+0xfa/0x140
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181589] [<ffffffff8117c893>] ?
ep_scan_ready_list+0x183/0x190
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181592] [<ffffffff81084570>] ?
autoremove_wake_function+0x0/0x40
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181595] [<ffffffff8117c972>] ?
ep_poll+0xb2/0x270
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181600] [<ffffffff81252446>] ?
security_file_permission+0x16/0x20
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181602] [<ffffffff81143278>]
vfs_write+0xb8/0x1a0
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181605] [<ffffffff81143b11>]
sys_write+0x51/0x80
Dec 2 14:36:19 th-ws-i706 kernel: [707908.181609] [<ffffffff810121b2>]
system_call_fastpath+0x16/0x1b
After that error message the processes are unkillable, the client sends a
packet storm to the server and apport hangs too, so I had to report this
manually.
If you need any further information, please ask. The problem is really
urgent for us.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/684318
Title:
nfs4 client hangs on LUCID
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