Kernel panic when shutdown

[Gorka Olaizola]

Binary package hint: linux-image-2.6.38-9-generic

Sometimes when I shutdown my machine it does not power down and the following messages appears on the console

[ 5925.728111] ------------[ cut here ]------------
[ 5925.728159] kernel BUG at /build/buildd/linux-2.6.38/fs/dcache.c:947!
[ 5925.728211] invalid opcode: 0000 [#1] SMP
[ 5925.728252] last sysfs file: /sys/devices/pci0000:00/0000:00:02.0/drm/card0/uevent
[ 5925.728313] Modules linked in: btrfs zlib_deflate libcrc32c ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs exportfs reiserfs nfs lockd fscache nfs_acl auth_rpcgss sunrpc binfmt_misc i915 drm_kms_helper drm i2c_algo_bit rfcomm sco bnep l2cap btusb bluetooth parport_pc ppdev lp parport autofs4 vesafb snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi applesmc input_polldev snd_seq_midi_event tpm_infineon snd_seq tpm tpm_bios snd_timer snd_seq_device snd soundcore snd_page_alloc video usbhid hid firewire_ohci firewire_core sky2 crc_itu_t
[ 5925.728910]
[ 5925.728926] Pid: 8946, comm: automount Not tainted 2.6.38-9-generic #43-Ubuntu Apple Computer, Inc. Macmini1,1/Mac-F4208EC8
[ 5925.729028] EIP: 0060:[<c1139619>] EFLAGS: 00010286 CPU: 0
[ 5925.729078] EIP is at shrink_dcache_for_umount_subtree+0x1c9/0x1d0
[ 5925.729128] EAX: 00000062 EBX: f976f4c8 ECX: c1739ba8 EDX: 00000000
[ 5925.729178] ESI: f32f0d80 EDI: f1a36f5c EBP: f374bef4 ESP: f374bec0
[ 5925.729227] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[ 5925.729271] Process automount (pid: 8946, ti=f374a000 task=f1ba3f20 task.ti=f374a000)
[ 5925.729332] Stack:
[ 5925.729350] c1691a98 f32f0d80 00002350 f32f0da4 00000002 f976f4c8 f1a36f5c 00000000
[ 5925.729432] 00000000 f32f0da4 f1a36e00 f32f0d80 f32f0dcc f374bf08 c113b670 f1a36e00
[ 5925.729515] f1a0f380 f976f080 f374bf24 c1128bb7 f32f0dcc 0000c512 00000016 f1a0f380
[ 5925.729597] Call Trace:
[ 5925.729626] [<c113b670>] shrink_dcache_for_umount+0x40/0x60
[ 5925.729678] [<c1128bb7>] generic_shutdown_super+0x27/0xe0
[ 5925.729723] [<c1128d01>] kill_anon_super+0x11/0x50
[ 5925.729764] [<c1128d5e>] kill_litter_super+0x1e/0x30
[ 5925.729810] [<f976b41d>] autofs4_kill_sb+0x3d/0x50 [autofs4]
[ 5925.729859] [<c112909d>] deactivate_locked_super+0x3d/0x60
[ 5925.729906] [<c1129b68>] deactivate_super+0x48/0x70
[ 5925.729949] [<c11413f0>] mntput_no_expire+0x90/0xd0
[ 5925.729990] [<c11421a2>] sys_umount+0x62/0xc0
[ 5925.730029] [<c114221e>] sys_oldumount+0x1e/0x20
[ 5925.730069] [<c150a034>] syscall_call+0x7/0xb
[ 5925.730105] Code: 03 8b 51 60 89 44 24 10 8b 45 f0 89 7c 24 18 89 5c 24 14 89 54 24 08 89 74 24 04 89 44 24 0c c7 04 24 98 1a 69 c1 e8 81 df 3c 00 <0f> 0b 0f 0b 8d 76 00 55 89 e5 83 ec 08 89 1c 24 89 74 24 04 3e
[ 5925.730462] EIP: [<c1139619>] shrink_dcache_for_umount_subtree+0x1c9/0x1d0 SS:ESP 0068:f374bec0
[ 5925.739459] ---[ end trace eefbb66ccccad728 ]---

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-9-generic 2.6.38-9.43
ProcVersionSignature: Ubuntu 2.6.38-9.43-generic 2.6.38.4
Uname: Linux 2.6.38-9-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1c', '/dev/snd/pcmC0D1p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0x90440000 irq 43'
   Mixer name : 'SigmaTel STAC9221 A1'
   Components : 'HDA:83847680,106b0800,00103401'
   Controls : 18
   Simple ctrls : 10
Date: Sat May 14 13:31:25 2011
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
MachineType: Apple Computer, Inc. Macmini1,1
ProcEnviron:
 PATH=(custom, no user)
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-9-generic root=UUID=43559059-c5f3-4c10-850b-dbf65084d506 ro splash vga=788 quiet quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-9-generic N/A
 linux-backports-modules-2.6.38-9-generic N/A
 linux-firmware 1.52
RfKill:
 0: hci0: Bluetooth
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to natty on 2011-04-25 (18 days ago)
WpaSupplicantLog:

dmi.bios.date: 10/12/06
dmi.bios.vendor: Apple Computer, Inc.
dmi.bios.version: MM11.88Z.0055.B08.0610121326
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Mac-F4208EC8
dmi.board.vendor: Apple Computer, Inc.
dmi.board.version: PVT
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 4
dmi.chassis.vendor: Apple Computer, Inc.
dmi.chassis.version: Mac-F4208EC8
dmi.modalias: dmi:bvnAppleComputer,Inc.:bvrMM11.88Z.0055.B08.0610121326:bd10/12/06:svnAppleComputer,Inc.:pnMacmini1,1:pvr1.0:rvnAppleComputer,Inc.:rnMac-F4208EC8:rvrPVT:cvnAppleComputer,Inc.:ct4:cvrMac-F4208EC8:
dmi.product.name: Macmini1,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Computer, Inc.