Public bug reported:

Hello,

I just got the BUG() below when runnig this script for ~2hours:
(as root)

#!/bin/sh

# 2-1.3 was discovered by removing and inserting the USB stick
# followed by dmesg
USBLIST="2-1.3"

while true ; do
  for USB in $USBLIST ; do 
      echo -n $USB >/sys/bus/usb/drivers/usb/unbind
  done    
  sleep 1
  for USB in $USBLIST ; do   
    echo -n $USB >/sys/bus/usb/drivers/usb/bind
  done  
  sleep 1
done

The script is a stresstest and simulates usb disconnect/reconnect.
Setup:

in one shell start:

udevadm monitor

in the other the script on the appropriate USB bus.

kernel: 3.0.0-20-generic-pae #34-Ubuntu SMP

regards,

Martin


[13012.149273] ------------[ cut here ]------------
[13012.149284] kernel BUG at /build/buildd/linux-3.0.0/mm/slub.c:2949!
[13012.149291] invalid opcode: 0000 [#1] SMP 
[13012.149300] Modules linked in: bnep rfcomm parport_pc ppdev binfmt_misc
joydev vesafb snd_hda_codec_conexant pcmcia arc4 snd_hda_intel snd_hda_codec
snd_hwdep snd_pcm thinkpad_acpi snd_seq_midi r592 yenta_socket pcmcia_rsrc
psmouse pcmcia_core snd_rawmidi snd_seq_midi_event snd_seq serio_raw
memstick uvcvideo r852 sm_common nand nand_ids nand_bch bch nand_ecc mtd
snd_timer iwlagn snd_seq_device videodev btusb snd mac80211 bluetooth
cfg80211 snd_page_alloc soundcore wmi nvram video tpm_tis mei(C) fglrx(P) lp
parport usbhid hid sdhci_pci sdhci firewire_ohci firewire_core crc_itu_t
ahci libahci e1000e btrfs zlib_deflate libcrc32c [last unloaded: kvm]
[13012.149440] 
[13012.149448] Pid: 15494, comm: disconnect.sh Tainted: P         C
3.0.0-20-generic-pae #34-Ubuntu LENOVO 2767F8G/2767F8G
[13012.149462] EIP: 0060:[<c1123f6f>] EFLAGS: 00010246 CPU: 1
[13012.149475] EIP is at kfree+0x10f/0x120
[13012.149481] EAX: 40000000 EBX: c1193191 ECX: 00000000 EDX: 00000001
[13012.149488] ESI: f40a2e00 EDI: c19826b0 EBP: d0d2ddbc ESP: d0d2dd94
[13012.149494]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[13012.149502] Process disconnect.sh (pid: 15494, ti=d0d2c000 task=d0f88cc0
task.ti=d0d2c000)
[13012.149508] Stack:
[13012.149512]  f6efdf90 00000000 d0d2ddb8 c1192202 f6efdf90 c1193191
d1e70350 f6efdf90
[13012.149530]  f6efdba0 c19826b0 d0d2ddd8 c1193191 00000000 00000000
f6efdf90 d0d2ddf8
[13012.149548]  f74b481c d0d2dde8 c119375b f6efdf90 f6efdfac d0d2de08
c1193cbf f6efdf90
[13012.149566] Call Trace:
[13012.149580]  [<c1192202>] ? sysfs_hash_and_remove+0x72/0x90
[13012.149589]  [<c1193191>] ? release_sysfs_dirent+0x91/0xd0
[13012.149598]  [<c1193191>] release_sysfs_dirent+0x91/0xd0
[13012.149607]  [<c119375b>] sysfs_addrm_finish+0x4b/0x60
[13012.149616]  [<c1193cbf>] sysfs_remove_dir+0x7f/0x90
[13012.149626]  [<c128cf6f>] kobject_del+0xf/0x30
[13012.149636]  [<c135fdd0>] device_del+0x120/0x150
[13012.149645]  [<c135fe10>] device_unregister+0x10/0x20
[13012.149656]  [<c13ef14a>] usb_remove_ep_devs+0x1a/0x30
[13012.149667]  [<c13e8698>] remove_intf_ep_devs+0x38/0x60
[13012.149675]  [<c13e9901>] usb_disable_device+0x81/0x1b0
[13012.149684]  [<c13ea189>] usb_set_configuration+0x1d9/0x610
[13012.149696]  [<c107519f>] ? blocking_notifier_call_chain+0x1f/0x30
[13012.149707]  [<c13f22e6>] generic_disconnect+0x26/0x30
[13012.149715]  [<c13eb7dc>] usb_unbind_device+0x1c/0x40
[13012.149724]  [<c136248b>] __device_release_driver+0x5b/0xb0
[13012.149733]  [<c1362504>] device_release_driver+0x24/0x40
[13012.149742]  [<c1361943>] driver_unbind+0x53/0x90
[13012.149751]  [<c13618f0>] ? store_drivers_probe+0x40/0x40
[13012.149759]  [<c1361344>] drv_attr_store+0x24/0x40
[13012.149768]  [<c11923e6>] sysfs_write_file+0xa6/0x100
[13012.149779]  [<c1134c7f>] vfs_write+0x8f/0x160
[13012.149787]  [<c1192340>] ? sysfs_poll+0x80/0x80
[13012.149796]  [<c1134f5d>] sys_write+0x3d/0x70
[13012.149807]  [<c156639f>] sysenter_do_call+0x12/0x28
[13012.149812] Code: e8 8b 75 dc 8b 4d f0 89 04 24 89 f8 89 f2 e8 03 af 42
00 eb a4 f6 c4 c0 74 11 89 f0 e8 9b e4 fc ff eb 96 8b 76 0c e9 33 ff ff ff
<0f> 0b eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 90 55 89 e5 53 
[13012.149915] EIP: [<c1123f6f>] kfree+0x10f/0x120 SS:ESP 0068:d0d2dd94
[13012.149930] ---[ end trace eb859dfd18bb1c0a ]---

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-3.0.0-20-generic-pae 3.0.0-20.34
ProcVersionSignature: Ubuntu 3.0.0-20.34-generic-pae 3.0.30
Uname: Linux 3.0.0-20-generic-pae i686
NonfreeKernelModules: fglrx
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu4
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  tux        1789 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfc220000 irq 48'
   Mixer name   : 'Conexant CX20561 (Hermosa)'
   Components   : 'HDA:14f15051,17aa211c,00100000 
HDA:14f12c06,17aa2122,00100000'
   Controls      : 16
   Simple ctrls  : 8
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 
7VHT14WW-1.03'
   Mixer name   : 'ThinkPad EC 7VHT14WW-1.03'
   Components   : ''
   Controls      : 1
   Simple ctrls  : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Sun May 27 13:26:57 2012
HibernationDevice: RESUME=UUID=de5f86c5-462e-467d-a176-22ef190c3d3a
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
MachineType: LENOVO 2767F8G
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.0.0-20-generic-pae 
root=UUID=867230fe-607e-4dc5-bd6e-21ae4270107e ro rootflags=subvol=@ quiet 
splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.0.0-20-generic-pae N/A
 linux-backports-modules-3.0.0-20-generic-pae  N/A
 linux-firmware                                1.60
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/13/2009
dmi.bios.vendor: LENOVO
dmi.bios.version: 7UET79WW (3.09 )
dmi.board.name: 2767F8G
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvr7UET79WW(3.09):bd10/13/2009:svnLENOVO:pn2767F8G:pvrThinkPadT400:rvnLENOVO:rn2767F8G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2767F8G
dmi.product.version: ThinkPad T400
dmi.sys.vendor: LENOVO

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


** Tags: apport-bug i386 oneiric running-unity staging

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https://bugs.launchpad.net/bugs/1005143

Title:
  kernel BUG at /build/buildd/linux-3.0.0/mm/slub.c:2949

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