Public bug reported:

Copying a device over NFS results in the below kernel panic. Roughly
350/500 gb were successfully copied before the panic. I have hit this
bug twice now in an attempt to copy the device.

ddrescue /dev/sda /nfs/media

Linux lexus 2.6.31-16-generic #53-Ubuntu SMP Tue Dec 8 04:02:15 UTC 2009 x86_64 
GNU/Linux
Ubuntu 2.6.31-16.53-generic
Description:    Ubuntu 9.10
Release:        9.10

nfs-common:
  Installed: 1:1.2.0-2ubuntu8
  Candidate: 1:1.2.0-2ubuntu8
  Version table:
 *** 1:1.2.0-2ubuntu8 0
        500 http://us.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status


Dec 15 15:56:34 lexus kernel: [35009.678488] BUG: unable to handle kernel 
paging request at ffff8800e59bdf10
Dec 15 15:56:34 lexus kernel: [35009.678504] IP: [<ffffffffa0befa88>] 
nfs_set_page_tag_locked+0x8/0x40 [nfs]
Dec 15 15:56:34 lexus kernel: [35009.678560] PGD 1002063 PUD 12067 PMD 0 
Dec 15 15:56:34 lexus kernel: [35009.678568] Oops: 0000 [#1] SMP 
Dec 15 15:56:34 lexus kernel: [35009.678574] last sysfs file: 
/sys/devices/virtual/block/ram9/uevent
Dec 15 15:56:34 lexus kernel: [35009.678582] CPU 1 
Dec 15 15:56:34 lexus kernel: [35009.678586] Modules linked in: binfmt_misc 
ppdev nfs lockd nfs_acl auth_rpcgss sunrpc snd_hda_codec_realtek snd_hda_intel 
snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy 
snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer 
snd_seq_device snd soundcore iptable_filter hwmon_vid i2c_nforce2 ip_tables 
amd64_edac_mod snd_page_alloc nvidia(P) k8temp edac_core serio_raw x_tables lp 
parport usbhid ohci1394 ieee1394 forcedeth
Dec 15 15:56:34 lexus kernel: [35009.678650] Pid: 9795, comm: nautilus Tainted: 
P           2.6.31-16-generic #53-Ubuntu Unknow
Dec 15 15:56:34 lexus kernel: [35009.678657] RIP: 0010:[<ffffffffa0befa88>]  
[<ffffffffa0befa88>] nfs_set_page_tag_locked+0x8/0x40 [nfs]
Dec 15 15:56:34 lexus kernel: [35009.678687] RSP: 0018:ffff880001ac5b28  
EFLAGS: 00010286
Dec 15 15:56:34 lexus kernel: [35009.678692] RAX: ffff8800e59bdf00 RBX: 
ffff8800c07de600 RCX: 0000000000000001
Dec 15 15:56:34 lexus kernel: [35009.678697] RDX: 0000000000000001 RSI: 
ffffea000082e5a8 RDI: ffff8800c07de600
Dec 15 15:56:34 lexus kernel: [35009.678702] RBP: ffff880001ac5b28 R08: 
0000000000000018 R09: 0000000000000000
Dec 15 15:56:34 lexus kernel: [35009.678707] R10: a040000000000000 R11: 
ffff8800bad448a8 R12: ffff8800c4c2eda0
Dec 15 15:56:34 lexus kernel: [35009.678712] R13: ffffea000082e5a8 R14: 
ffff880001ac5cf8 R15: ffff880001ac5c70
Dec 15 15:56:34 lexus kernel: [35009.678719] FS:  00007f7e7c768910(0000) 
GS:ffff88002803d000(0000) knlGS:00000000f6a36750
Dec 15 15:56:34 lexus kernel: [35009.678725] CS:  0010 DS: 0000 ES: 0000 CR0: 
000000008005003b
Dec 15 15:56:34 lexus kernel: [35009.678729] CR2: ffff8800e59bdf10 CR3: 
00000000ca0ba000 CR4: 00000000000006e0
Dec 15 15:56:34 lexus kernel: [35009.678735] DR0: 0000000000000000 DR1: 
0000000000000000 DR2: 0000000000000000
Dec 15 15:56:34 lexus kernel: [35009.678740] DR3: 0000000000000000 DR6: 
00000000ffff0ff0 DR7: 0000000000000400
Dec 15 15:56:34 lexus kernel: [35009.678746] Process nautilus (pid: 9795, 
threadinfo ffff880001ac4000, task ffff880085172d60)
Dec 15 15:56:34 lexus kernel: [35009.678750] Stack:
Dec 15 15:56:34 lexus kernel: [35009.678753]  ffff880001ac5b68 ffffffffa0bf3878 
ffff880037a14848 ffffea000082e5a8
Dec 15 15:56:34 lexus kernel: [35009.678761] <0> ffff880001ac5cf8 
ffffea000082e5a8 0000000000000008 ffff880001ac5c70
Dec 15 15:56:34 lexus kernel: [35009.678769] <0> ffff880001ac5b88 
ffffffffa0bf3a02 ffffea000082e5a8 ffff8800c4c2ee08
Dec 15 15:56:34 lexus kernel: [35009.678779] Call Trace:
Dec 15 15:56:34 lexus kernel: [35009.678808]  [<ffffffffa0bf3878>] 
nfs_page_async_flush+0x38/0x140 [nfs]
Dec 15 15:56:34 lexus kernel: [35009.678835]  [<ffffffffa0bf3a02>] 
nfs_do_writepage+0x82/0x90 [nfs]
Dec 15 15:56:34 lexus kernel: [35009.678861]  [<ffffffffa0bf4129>] 
nfs_writepages_callback+0x19/0x40 [nfs]
Dec 15 15:56:34 lexus kernel: [35009.678875]  [<ffffffff810e35e9>] 
write_cache_pages+0x1f9/0x4e0
Dec 15 15:56:34 lexus kernel: [35009.678904]  [<ffffffffa0bf4110>] ? 
nfs_writepages_callback+0x0/0x40 [nfs]
Dec 15 15:56:34 lexus kernel: [35009.678932]  [<ffffffffa0bf4094>] 
nfs_writepages+0xb4/0x130 [nfs]
Dec 15 15:56:34 lexus kernel: [35009.678959]  [<ffffffffa0bf4380>] ? 
nfs_flush_one+0x0/0xf0 [nfs]
Dec 15 15:56:34 lexus kernel: [35009.678986]  [<ffffffffa0bf5166>] 
nfs_write_mapping+0x66/0xb0 [nfs]
Dec 15 15:56:34 lexus kernel: [35009.679013]  [<ffffffffa0bf51c5>] 
nfs_wb_nocommit+0x15/0x20 [nfs]
Dec 15 15:56:34 lexus kernel: [35009.679038]  [<ffffffffa0be7ce0>] 
nfs_getattr+0x120/0x130 [nfs]
Dec 15 15:56:34 lexus kernel: [35009.679047]  [<ffffffff8127c31d>] ? 
copy_user_generic_string+0x2d/0x40
Dec 15 15:56:34 lexus kernel: [35009.679056]  [<ffffffff81123709>] 
vfs_getattr+0x49/0x80
Dec 15 15:56:34 lexus kernel: [35009.679062]  [<ffffffff81123798>] 
vfs_fstatat+0x58/0x70
Dec 15 15:56:34 lexus kernel: [35009.679069]  [<ffffffff81123819>] 
vfs_lstat+0x19/0x20
Dec 15 15:56:34 lexus kernel: [35009.679075]  [<ffffffff8112383f>] 
sys_newlstat+0x1f/0x50
Dec 15 15:56:34 lexus kernel: [35009.679086]  [<ffffffff8152a289>] ? 
do_device_not_available+0x9/0x10
Dec 15 15:56:34 lexus kernel: [35009.679094]  [<ffffffff81012e9b>] ? 
device_not_available+0x1b/0x20
Dec 15 15:56:34 lexus kernel: [35009.679104]  [<ffffffff81012002>] 
system_call_fastpath+0x16/0x1b
Dec 15 15:56:34 lexus kernel: [35009.679108] Code: 5f b4 03 00 48 89 de e8 07 
4b 52 e0 48 8b 1c 24 4c 8b 64 24 08 c9 c3 66 66 66 2e 0f 1f 84 00 00 00 00 00 
55 48 8b 47 18 48 89 e5 <48> 8b 40 10 48 8b 48 10 f0 0f ba 6f 40 00 19 d2 31 c0 
85 d2 75 
Dec 15 15:56:34 lexus kernel: [35009.679169] RIP  [<ffffffffa0befa88>] 
nfs_set_page_tag_locked+0x8/0x40 [nfs]
Dec 15 15:56:34 lexus kernel: [35009.679197]  RSP <ffff880001ac5b28>
Dec 15 15:56:34 lexus kernel: [35009.679200] CR2: ffff8800e59bdf10
Dec 15 15:56:34 lexus kernel: [35009.679206] ---[ end trace 0105ad4a64ac8c4a 
]---
Dec 15 15:57:39 lexus kernel: [35074.852488] BUG: soft lockup - CPU#1 stuck for 
61s! [rpciod/1:1689]
Dec 15 15:57:39 lexus kernel: [35074.852492] Modules linked in: binfmt_misc 
ppdev nfs lockd nfs_acl auth_rpcgss sunrpc snd_hda_codec_realtek snd_hda_intel 
snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy 
snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer 
snd_seq_devic
e snd soundcore iptable_filter hwmon_vid i2c_nforce2 ip_tables amd64_edac_mod 
snd_page_alloc nvidia(P) k8temp edac_core serio_raw x_tables lp parport usbhid 
ohci1394 ieee1394 forcedeth
Dec 15 15:57:39 lexus kernel: [35074.852507] CPU 1:
Dec 15 15:57:39 lexus kernel: [35074.852507] Modules linked in: binfmt_misc 
ppdev nfs lockd nfs_acl auth_rpcgss sunrpc snd_hda_codec_realtek snd_hda_intel 
snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy 
snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer 
snd_seq_device snd soundcore iptable_filter hwmon_vid i2c_nforce2 ip_tables 
amd64_edac_mod snd_page_alloc nvidia(P) k8temp edac_core serio_raw x_tables lp 
parport usbhid ohci1394 ieee1394 forcedeth
Dec 15 15:57:39 lexus kernel: [35074.852507] Pid: 1689, comm: rpciod/1 Tainted: 
P      D    2.6.31-16-generic #53-Ubuntu Unknow
Dec 15 15:57:39 lexus kernel: [35074.852507] RIP: 0010:[<ffffffff81036392>]  
[<ffffffff81036392>] __ticket_spin_lock+0x12/0x20
Dec 15 15:57:39 lexus kernel: [35074.852507] RSP: 0018:ffff8800d53ddd20  
EFLAGS: 00000297
Dec 15 15:57:39 lexus kernel: [35074.852507] RAX: 0000000000008b8a RBX: 
ffff8800d53ddd20 RCX: 000000004899254b
Dec 15 15:57:39 lexus kernel: [35074.852507] RDX: 0000000000040000 RSI: 
ffff8800a30f4720 RDI: ffff8800c4c2eda0
Dec 15 15:57:39 lexus kernel: [35074.852507] RBP: ffffffff81012bae R08: 
0000000000000000 R09: 0000000000000000
Dec 15 15:57:39 lexus kernel: [35074.852507] R10: 0000000000000001 R11: 
00000000ffffffff R12: ffff8800d88a39c0
Dec 15 15:57:39 lexus kernel: [35074.852507] R13: 0000000000004000 R14: 
ffff8800dedd9380 R15: ffffffff8142999a
Dec 15 15:57:39 lexus kernel: [35074.852507] FS:  00007f8c66fe46f0(0000) 
GS:ffff88002803d000(0000) knlGS:00000000f6a36750
Dec 15 15:57:39 lexus kernel: [35074.852507] CS:  0010 DS: 0018 ES: 0018 CR0: 
000000008005003b
Dec 15 15:57:39 lexus kernel: [35074.852507] CR2: ffff8800e59bdf10 CR3: 
0000000001001000 CR4: 00000000000006e0
Dec 15 15:57:39 lexus kernel: [35074.852507] DR0: 0000000000000000 DR1: 
0000000000000000 DR2: 0000000000000000
Dec 15 15:57:39 lexus kernel: [35074.852507] DR3: 0000000000000000 DR6: 
00000000ffff0ff0 DR7: 0000000000000400
Dec 15 15:57:39 lexus kernel: [35074.852507] Call Trace:
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffff81529a49>] ? 
_spin_lock+0x9/0x10
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffffa0be7220>] ? 
nfs_post_op_update_inode_force_wcc+0x30/0x240 [nfs]
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffffa0bf658c>] ? 
nfs3_write_done+0x4c/0x60 [nfs]
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffffa0bf3c3c>] ? 
nfs_writeback_done+0x5c/0x250 [nfs]
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffffa0bf3e39>] ? 
nfs_writeback_done_full+0x9/0x10 [nfs]
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffffa0b965d7>] ? 
rpc_exit_task+0x27/0x60 [sunrpc]
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffffa0b96e4a>] ? 
__rpc_execute+0xba/0x220 [sunrpc]
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffffa0b96fe0>] ? 
rpc_async_schedule+0x0/0x20 [sunrpc]
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffffa0b96ff0>] ? 
rpc_async_schedule+0x10/0x20 [sunrpc]
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffff810737a5>] ? 
run_workqueue+0x95/0x170
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffff81073924>] ? 
worker_thread+0xa4/0x120
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffff81078b30>] ? 
autoremove_wake_function+0x0/0x40
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffff81073880>] ? 
worker_thread+0x0/0x120
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffff81078746>] ? 
kthread+0xa6/0xb0
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffff810130ea>] ? 
child_rip+0xa/0x20
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffff810786a0>] ? 
kthread+0x0/0xb0
Dec 15 15:57:39 lexus kernel: [35074.852507]  [<ffffffff810130e0>] ? 
child_rip+0x0/0x20

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

-- 
kernel panic 2.6.31-16-generic nfs "BUG: unable to handle kernel paging request"
https://bugs.launchpad.net/bugs/497269
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