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Subject[Bug 667] New: Removing USB mass storage causes slab corruption, oops

Summary: Removing USB mass storage causes slab corruption, oops
Kernel Version: 2.5.69
Status: NEW
Severity: normal

Distribution: Debian GNU/Linux, unstable
Hardware Environment: PIII 500 MHz laptop, Intel PIIX4 USB/IDE
Software Environment: No module support, only existing hardware devices compiled
into kernel
Problem Description: Removal of USB mass storage device causes slab corruption,
then kernel oops. USB devices no longer work after oops but kernel continues to

Steps to reproduce: Insert and remove USB mass storage device a few times.
Mounting the device doesn't appear to be necessary. All of the mass storage
devices I've tried cause this bug, usually on the third (slab corruption) and
fourth (oops) removal.

Note that this is the same behavior as reported in Bug #633.

Here's the kernel log messages after the third (slab corruption) and fourth
(oops) removal. The insertion is in between.

scsi0 : SCSI emulation for USB Mass Storage devices
Vendor: Generic Model: USB SD Reader Rev: 2.00
Type: Direct-Access ANSI SCSI revision: 02
Slab corruption: start=c79e1784, expend=c79e17e3, problemat=c79e17b4
Last user: [load_elf_interp+310/560](load_elf_interp+0x136/0x230)
Data: ************************************************74 12 9E C7
Next: 71 F0 2C .66 26 1B C0 71 F0 2C .********************
slab error in check_poison_obj(): cache `size-96': object was modified after freeing
Call Trace:
[check_poison_obj+347/432] check_poison_obj+0x15b/0x1b0
[kmalloc+361/448] kmalloc+0x169/0x1c0
[load_elf_interp+162/560] load_elf_interp+0xa2/0x230
[load_elf_interp+162/560] load_elf_interp+0xa2/0x230
[load_elf_binary+1075/3200] load_elf_binary+0x433/0xc80
[copy_strings+515/592] copy_strings+0x203/0x250
[load_elf_binary+0/3200] load_elf_binary+0x0/0xc80
[search_binary_handler+133/320] search_binary_handler+0x85/0x140
[do_execve+489/528] do_execve+0x1e9/0x210
[sys_execve+77/128] sys_execve+0x4d/0x80
[syscall_call+7/11] syscall_call+0x7/0xb

SCSI device sda: 250880 512-byte hdwr sectors (128 MB)
sda: Write Protect is off
sda: Mode Sense: 03 00 00 00
sda: cache data unavailable
sda: assuming drive cache: write through
sda: sda1
Attached scsi removable disk sda at scsi0, channel 0, id 0, lun 0
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 4
usb 1-1: USB disconnect, address 4
Unable to handle kernel paging request at virtual address 6b6b6b6d
printing eip:
*pde = 00000000
Oops: 0000 [#1]
CPU: 0
EIP: 0060:[proc_match+19/64] Not tainted
EFLAGS: 00010286
EIP is at proc_match+0x13/0x40
eax: 6b6b6b6b ebx: c79e1784 ecx: 6b6b6b6b edx: c11f5dc8
esi: c11f5dc8 edi: c79e17b4 ebp: c11f5d8c esp: c11f5d84
ds: 007b es: 007b ss: 0068
Process khubd (pid: 4, threadinfo=c11f4000 task=c114d320)
Stack: 00000001 c79e17b4 c11f5db4 c01bd962 00000001 c11f5dc8 6b6b6b6b c11f5db4
c11f5dc8 c7e901b0 c11f5dc8 c6c87c68 c11f5de0 c0332422 c11f5dc8 c79e1784
00000000 c6e00030 c6c87c68 c11f5e58 c7e901b0 c7e901b0 c6e04e00 c11f5e58
Call Trace:
[remove_proc_entry+82/288] remove_proc_entry+0x52/0x120
[scsi_proc_host_rm+66/112] scsi_proc_host_rm+0x42/0x70
[scsi_unregister+253/576] scsi_unregister+0xfd/0x240
[scsi_remove_device+64/80] scsi_remove_device+0x40/0x50
[scsi_remove_device+64/80] scsi_remove_device+0x40/0x50
[storage_disconnect+430/786] storage_disconnect+0x1ae/0x312
[iput+99/144] iput+0x63/0x90
[storage_disconnect+0/786] storage_disconnect+0x0/0x312
[usb_device_remove+151/160] usb_device_remove+0x97/0xa0
[device_release_driver+94/96] device_release_driver+0x5e/0x60
[bus_remove_device+127/208] bus_remove_device+0x7f/0xd0
[device_del+108/176] device_del+0x6c/0xb0
[device_unregister+20/34] device_unregister+0x14/0x22
[usb_disconnect+199/352] usb_disconnect+0xc7/0x160
[usb_hub_port_connect_change+831/848] usb_hub_port_connect_change+0x33f/0x350
[usb_hub_port_status+104/176] usb_hub_port_status+0x68/0xb0
[usb_hub_events+1014/1392] usb_hub_events+0x3f6/0x570
[allow_signal+204/512] allow_signal+0xcc/0x200
[usb_hub_thread+53/240] usb_hub_thread+0x35/0xf0
[default_wake_function+0/32] default_wake_function+0x0/0x20
[usb_hub_thread+0/240] usb_hub_thread+0x0/0xf0
[kernel_thread_helper+5/24] kernel_thread_helper+0x5/0x18

Code: 0f b7 48 02 3b 4d 08 74 14 31 c0 8b 34 24 8b 7c 24 04 89 ec

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