Comment 2 for bug 738876

Similar error after umount an external usb drive, having 3 of them and an SD card.
This is the first time I can see the log and copy it (the crash just affected the nautilus window); since Natty upgrade I have experienced several crashes but with just a text screen with no option but reboot.

Output from dmesg. I don't know exactly the information to submit, but I hope this log is related to this bug

[ 1300.540119] usb 2-8: USB disconnect, address 6
[ 3026.454520] VFS: Busy inodes after unmount of sde. Self-destruct in 5 seconds. Have a nice day...
[ 3026.475523] BUG: unable to handle kernel NULL pointer dereference at 00000000000000f0
[ 3026.479072] IP: [<ffffffff81038bd9>] __ticket_spin_lock+0x9/0x20
[ 3026.480008] PGD 11c80e067 PUD 11c80f067 PMD 0
[ 3026.480008] Oops: 0002 [#1] SMP
[ 3026.480008] last sysfs file: /sys/devices/pci0000:00/0000:00:1a.7/usb1/1-4/speed
[ 3026.480008] CPU 0
[ 3026.480008] Modules linked in: nls_iso8859_1 nls_cp437 vfat fat cryptd aes_x86_64 aes_generic binfmt_misc vboxnetadp vboxnetflt vboxdrv parport_pc ppdev snd_hda_codec_hdmi snd_hda_codec_realtek joydev arc4 snd_hda_intel iwlagn snd_hda_codec snd_hwdep snd_pcm i915 snd_seq_midi snd_rawmidi iwlcore snd_seq_midi_event mac80211 snd_seq uvcvideo videodev acer_wmi v4l2_compat_ioctl32 drm_kms_helper snd_timer acpi_igd_opregion(P) snd_seq_device sparse_keymap cfg80211 drm psmouse snd serio_raw i2c_algo_bit soundcore video snd_page_alloc lp parport usb_storage uas ahci atl1c libahci
[ 3026.480008]
[ 3026.480008] Pid: 1609, comm: nautilus Tainted: P I 2.6.38-10-generic #46+kamal~mjgbacklight4-Ubuntu Acer Aspire 5810T/Aspire 5810T
[ 3026.480008] RIP: 0010:[<ffffffff81038bd9>] [<ffffffff81038bd9>] __ticket_spin_lock+0x9/0x20
[ 3026.480008] RSP: 0018:ffff88011c8fde28 EFLAGS: 00010206
[ 3026.480008] RAX: 0000000000010000 RBX: 00000000000000f0 RCX: ffff88010fa410c0
[ 3026.480008] RDX: 0000000000000004 RSI: ffff8800aaa1a2f8 RDI: 00000000000000f0
[ 3026.480008] RBP: ffff88011c8fde28 R08: 1038000000000000 R09: 00aaa1a3881c0000
[ 3026.480008] R10: ff375e87204ce207 R11: 0000000000000001 R12: ffff8800aaa1a340
[ 3026.480008] R13: ffff880132a5f864 R14: ffff8800b464f9b0 R15: ffff8800aaa1a340
[ 3026.480008] FS: 00007f66310679c0(0000) GS:ffff8800bb600000(0000) knlGS:0000000000000000
[ 3026.480008] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3026.480008] CR2: 00000000000000f0 CR3: 000000012522f000 CR4: 00000000000406f0
[ 3026.480008] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3026.480008] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 3026.480008] Process nautilus (pid: 1609, threadinfo ffff88011c8fc000, task ffff88011c8dc4a0)
[ 3026.480008] Stack:
[ 3026.480008] ffff88011c8fde38 ffffffff815c31be ffff88011c8fde58 ffffffffa059fe63
[ 3026.480008] ffff8800aaa1a340 ffffffff81cdb040 ffff88011c8fde78 ffffffffa059ff0e
[ 3026.480008] 7fffffffffffffff ffff8800aaa1a340 ffff88011c8fde98 ffffffff8117dbd4
[ 3026.480008] Call Trace:
[ 3026.480008] [<ffffffff815c31be>] _raw_spin_lock+0xe/0x20
[ 3026.480008] [<ffffffffa059fe63>] fat_detach+0x33/0x80 [fat]
[ 3026.480008] [<ffffffffa059ff0e>] fat_evict_inode+0x5e/0x70 [fat]
[ 3026.480008] [<ffffffff8117dbd4>] evict+0x24/0xc0
[ 3026.480008] [<ffffffff8117e8c7>] iput_final+0x187/0x270
[ 3026.480008] [<ffffffff8117e9eb>] iput+0x3b/0x50
[ 3026.480008] [<ffffffff8119f818>] fsnotify_destroy_mark+0x178/0x190
[ 3026.480008] [<ffffffff811a178a>] sys_inotify_rm_watch+0x7a/0xd0
[ 3026.480008] [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b
[ 3026.480008] Code: 00 00 48 c7 c2 de 89 03 81 48 c7 c1 e1 89 03 81 e9 dd fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 55 b8 00 00 01 00 48 89 e5 <3e> 0f c1 07 0f b7 d0 c1 e8 10 39 c2 74 07 f3 90 0f b7 17 eb f5
[ 3026.480008] RIP [<ffffffff81038bd9>] __ticket_spin_lock+0x9/0x20
[ 3026.480008] RSP <ffff88011c8fde28>
[ 3026.480008] CR2: 00000000000000f0
[ 3026.588527] ---[ end trace a7919e7f17c0a727 ]---