I can confirm what knarf just said : same story on a fresh installed Gutsy
system, using a 2.6.22 kernel :
$ uname -a
Linux nanook 2.6.22-14-generic #1 SMP Sun Oct 14 23:05:12 GMT 2007 i686
GNU/Linux
Once in a while nautilus hangs, and dmesg shows this :
[119042.147998] BUG: unable to handle kernel NULL pointer dereference at
virtual address 0000000c
[119042.148007] printing eip:
[119042.148009] f8c8acf5
[119042.148011] *pde = 00000000
[119042.148015] Oops: 0000 [#1]
[119042.148017] SMP
[119042.148021] Modules linked in: rfcomm l2cap bluetooth af_packet ppdev
autofs4 sbs container dock ac video button battery nfs lockd sunrpc sbp2
parport_pc lp parport snd_atiixp snd_ac97_codec ac97_bus 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 joydev snd_timer snd_seq_device snd soundcore
snd_page_alloc usbhid hid serio_raw psmouse pcspkr i2c_piix4 shpchp ati_agp
agpgart pci_hotplug i2c_core evdev ext3 jbd mbcache ide_disk ide_cd cdrom
atiixp ide_core ohci_hcd ohci1394 ieee1394 ata_generic libata scsi_mod ehci_hcd
8139too 8139cp mii usbcore thermal processor fan fuse apparmor commoncap
[119042.148101] CPU: 1
[119042.148102] EIP: 0060:[<f8c8acf5>] Not tainted VLI
[119042.148104] EFLAGS: 00010246 (2.6.22-14-generic #1)
[119042.148125] EIP is at nfs_update_inode+0xc5/0x6d0 [nfs]
[119042.148128] eax: 00000000 ebx: 000081a4 ecx: 000081a4 edx: 00008000
[119042.148131] esi: 02aa1ca3 edi: f6bc4900 ebp: decd3618 esp: f269fdd8
[119042.148134] ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
[119042.148138] Process umount.nfs4 (pid: 19023, ti=f269e000 task=f20039f0
task.ti=f269e000)
[119042.148140] Stack: decd3618 c02f300b 00000001 e74a5880 00000004 00000000
f20039f0 efc8d0b0
[119042.148150] decd34f0 f269fe1c decd3618 01c594f3 c01320c5 e74a5800
00000000 decd3618
[119042.148159] efc8d0b0 e74a5800 decd3618 f8c8c6d4 efc8d000 00000000
f8c9a4fb efc8d000
[119042.148168] Call Trace:
[119042.148173] [<c02f300b>] out_of_line_wait_on_bit+0x7b/0x90
[119042.148199] [<c01320c5>] sigprocmask+0x65/0x100
[119042.148217] [<f8c8c6d4>] nfs_post_op_update_inode+0x24/0x50 [nfs]
[119042.148235] [<f8c9a4fb>] nfs4_proc_delegreturn+0x17b/0x180 [nfs]
[119042.148272] [<f8ca6867>] nfs_do_return_delegation+0x17/0x30 [nfs]
[119042.148292] [<f8c892e9>] nfs_dentry_iput+0x29/0x80 [nfs]
[119042.148309] [<c0191f02>] shrink_dcache_for_umount_subtree+0x82/0x230
[119042.148317] [<c017b123>] add_partial+0x13/0x40
[119042.148325] [<c017b123>] add_partial+0x13/0x40
[119042.148333] [<c017beb1>] __slab_free+0x111/0x2a0
[119042.148345] [<c0192d27>] shrink_dcache_for_umount+0x37/0x50
[119042.148351] [<c0182258>] generic_shutdown_super+0x18/0xf0
[119042.148363] [<c0182359>] kill_anon_super+0x9/0x40
[119042.148370] [<f8c8d28c>] nfs_kill_super+0xc/0x20 [nfs]
[119042.148384] [<c018240d>] deactivate_super+0x5d/0x80
[119042.148392] [<c0197112>] expire_mount_list+0xc2/0x140
[119042.148411] [<c0198293>] shrink_submounts+0xb3/0xd0
[119042.148431] [<c0197299>] sys_umount+0x109/0x270
[119042.148453] [<c01928b7>] dput+0x87/0x100
[119042.148459] [<c01816eb>] __fput+0x12b/0x1a0
[119042.148472] [<c0196cc4>] mntput_no_expire+0x24/0xa0
[119042.148492] [<c0197417>] sys_oldumount+0x17/0x20
[119042.148500] [<c01041d2>] sysenter_past_esp+0x6b/0xa9
[119042.148537] =======================
[119042.148539] Code: 0f ba ab 8c 00 00 00 02 89 e8 e8 e7 fc ff ff b8 8c ff ff
ff 83 c4 3c 5b 5e 5f 5d c3 8b 85 98 00 00 00 8b b8 64 01 00 00 8b 40 38 <3b> 68
0c 0f 84 57 04 00 00 8b 54 24 1c 8b 4c 24 20 8b 82 8c 00
[119042.148591] EIP: [<f8c8acf5>] nfs_update_inode+0xc5/0x6d0 [nfs] SS:ESP
0068:f269fdd8
[119103.944127] BUG: unable to handle kernel NULL pointer dereference at
virtual address 0000000c
[119103.944144] printing eip:
[119103.944148] f8c8acf5
[119103.944150] *pde = 00000000
[119103.944155] Oops: 0000 [#2]
[119103.944158] SMP
[119103.944164] Modules linked in: rfcomm l2cap bluetooth af_packet ppdev
autofs4 sbs container dock ac video button battery nfs lockd sunrpc sbp2
parport_pc lp parport snd_atiixp snd_ac97_codec ac97_bus 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 joydev snd_timer snd_seq_device snd soundcore
snd_page_alloc usbhid hid serio_raw psmouse pcspkr i2c_piix4 shpchp ati_agp
agpgart pci_hotplug i2c_core evdev ext3 jbd mbcache ide_disk ide_cd cdrom
atiixp ide_core ohci_hcd ohci1394 ieee1394 ata_generic libata scsi_mod ehci_hcd
8139too 8139cp mii usbcore thermal processor fan fuse apparmor commoncap
[119103.944269] CPU: 0
[119103.944270] EIP: 0060:[<f8c8acf5>] Not tainted VLI
[119103.944272] EFLAGS: 00010246 (2.6.22-14-generic #1)
[119103.944297] EIP is at nfs_update_inode+0xc5/0x6d0 [nfs]
[119103.944301] eax: 00000000 ebx: 000081a4 ecx: 000081a4 edx: 00008000
[119103.944306] esi: 02aa1c9e edi: f6bc4900 ebp: d027b890 esp: d013bf24
[119103.944310] ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068
[119103.944316] Process 192.168.0.2-del (pid: 19085, ti=d013a000 task=f20034c0
task.ti=d013a000)
[119103.944319] Stack: d027b890 c02f300b 00000001 f6495c80 00000004 00000000
f20034c0 f3d4e4b0
[119103.944332] d027b768 d013bf68 d027b890 01c5d164 c01320c5 f6495c00
00000000 d027b890
[119103.944345] f3d4e4b0 f6495c00 d027b890 f8c8c6d4 f3d4e400 00000000
f8c9a4fb f3d4e400
[119103.944358] Call Trace:
[119103.944366] [<c02f300b>] out_of_line_wait_on_bit+0x7b/0x90
[119103.944400] [<c01320c5>] sigprocmask+0x65/0x100
[119103.944424] [<f8c8c6d4>] nfs_post_op_update_inode+0x24/0x50 [nfs]
[119103.944449] [<f8c9a4fb>] nfs4_proc_delegreturn+0x17b/0x180 [nfs]
[119103.944500] [<f8ca6867>] nfs_do_return_delegation+0x17/0x30 [nfs]
[119103.944528] [<f8ca70f7>] nfs_do_expire_all_delegations+0x77/0xa0 [nfs]
[119103.944558] [<f8ca7080>] nfs_do_expire_all_delegations+0x0/0xa0 [nfs]
[119103.944584] [<c013bb12>] kthread+0x42/0x70
[119103.944592] [<c013bad0>] kthread+0x0/0x70
[119103.944602] [<c0105487>] kernel_thread_helper+0x7/0x10
[119103.944625] =======================
[119103.944628] Code: 0f ba ab 8c 00 00 00 02 89 e8 e8 e7 fc ff ff b8 8c ff ff
ff 83 c4 3c 5b 5e 5f 5d c3 8b 85 98 00 00 00 8b b8 64 01 00 00 8b 40 38 <3b> 68
0c 0f 84 57 04 00 00 8b 54 24 1c 8b 4c 24 20 8b 82 8c 00
[119103.944699] EIP: [<f8c8acf5>] nfs_update_inode+0xc5/0x6d0 [nfs] SS:ESP
0068:d013bf24
--
2.6.17-10-generic (edgy) -- BUG: unable to handle kernel NULL pointer
dereference at virtual address 00000000
https://bugs.launchpad.net/bugs/65827
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