Feb  5 16:23:48 pegasus-maverick ntfs-3g[21027]: Unmounting /dev/sdf1 (My Passport)
Feb  5 16:23:48 pegasus-maverick kernel: [48056.704768] EXT4-fs error (device sdb1): ext4_find_entry:933: inode #2: comm gnome-panel: reading directory lblock 0
Feb  5 16:23:50 pegasus-maverick kernel: [48056.730252] ------------[ cut here ]------------
Feb  5 16:23:50 pegasus-maverick kernel: [48056.740133] kernel BUG at fs/inode.c:1421!
Feb  5 16:23:50 pegasus-maverick kernel: [48056.740133] invalid opcode: 0000 [#1] SMP 
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] last sysfs file: /sys/devices/pci0000:00/0000:00:1d.7/class
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] CPU 1 
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] Modules linked in: nls_utf8 udf ses enclosure wacom cryptd aes_x86_64 aes_generic usb_storage hidp rfcomm binfmt_misc sco bnep l2cap vboxnetadp vboxnetflt vboxdrv parport_pc ppdev dm_crypt btrfs zlib_deflate crc32c libcrc32c snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm nvidia(P) snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event arc4 snd_seq snd_timer r852 snd_seq_device sm_common nand iwlagn iwlcore mac80211 cfg80211 snd uvcvideo videodev btusb nand_ids soundcore bluetooth psmouse serio_raw nand_ecc dell_laptop snd_page_alloc v4l2_compat_ioctl32 dcdbas mtd dell_wmi joydev sparse_keymap lp parport usbhid hid firewire_ohci firewire_core crc_itu_t sdhci_pci ahci sky2 sdhci libahci intel_agp intel_gtt
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] 
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] Pid: 22343, comm: umount Tainted: P            2.6.38-rc3-generic #1       /XPS M1530                       
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] RIP: 0010:[<ffffffff811736e5>]  [<ffffffff811736e5>] iput+0x255/0x2b0
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] RSP: 0018:ffff8800ab805d98  EFLAGS: 00010202
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] RAX: 0000000000000000 RBX: ffff880114e8e160 RCX: 0000000000000000
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] RDX: 000000000000017f RSI: ffffffff81a21960 RDI: ffff880114e8e160
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] RBP: ffff8800ab805db8 R08: ffff8800db87953c R09: ffff88011249e300
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] R10: 0000000000000000 R11: 00000000000f3590 R12: 0000000000000000
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] R13: 0000000000000083 R14: ffff880114e8e0a0 R15: ffff880114e8dd40
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] FS:  00007ffda98f4740(0000) GS:ffff8800dfd00000(0000) knlGS:0000000000000000
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] CR2: 00000000021f66d0 CR3: 0000000105137000 CR4: 00000000000006e0
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] Process umount (pid: 22343, threadinfo ffff8800ab804000, task ffff880034e3db00)
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] Stack:
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352]  ffff8800ab805db8 ffff880114e8e080 0000000000000000 0000000000000083
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352]  ffff8800ab805e08 ffffffff8118dc41 ffff8800ab805de8 0000000000000000
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352]  ffff88009d7e8400 ffff880114e8e080 0000000000000083 ffff880114e8e0a0
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] Call Trace:
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352]  [<ffffffff8118dc41>] __blkdev_put+0x131/0x1b0
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352]  [<ffffffff8118dd92>] blkdev_put+0xd2/0x170
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352]  [<ffffffff8115c26e>] kill_block_super+0x4e/0x80
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352]  [<ffffffff81257e22>] fuse_kill_sb_blk+0x52/0x60
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352]  [<ffffffff8115c725>] deactivate_locked_super+0x45/0x60
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352]  [<ffffffff8115d56a>] deactivate_super+0x4a/0x70
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352]  [<ffffffff81177bf4>] mntput_no_expire+0xa4/0xf0
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352]  [<ffffffff8117870c>] sys_umount+0x6c/0x3a0
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352]  [<ffffffff8100bf42>] system_call_fastpath+0x16/0x1b
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] Code: 15 41 21 8b 00 83 05 0e d0 b4 00 01 48 89 05 33 21 8b 00 48 89 42 08 48 89 53 78 48 c7 83 80 00 00 00 00 58 a2 81 e9 44 fe ff ff <0f> 0b 0f 0b be 6e 05 00 00 48 c7 c7 bd 17 7d 81 e8 06 f2 ee ff 
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352] RIP  [<ffffffff811736e5>] iput+0x255/0x2b0
Feb  5 16:23:50 pegasus-maverick kernel: [48056.777352]  RSP <ffff8800ab805d98>
Feb  5 16:23:50 pegasus-maverick kernel: [48057.971122] ---[ end trace 50847dbed789e3ce ]---