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Subject[Bugme-new] [Bug 1591] New: umount from disconnected USB causes kernel oops (fwd)
http://bugme.osdl.org/show_bug.cgi?id=1591

Summary: umount from disconnected USB causes kernel oops
Kernel Version: 2.6.0-test7
Status: NEW
Severity: low
Owner: bugme-janitors@lists.osdl.org
Submitter: office@produktivit.com


Distribution: Debian unstable (current)
Hardware Environment: x86 UMP, K7
Software Environment: bash, mount, usb-storage
Problem Description: umount from disconnected USB causes kernel oops

Steps to reproduce:

Insert USB camera, let it time out (10 min of no activity) so it disconnects from bus. If
it was mounted somewhere and it disconnects, umount gives a kernel oops.

smartass:/home/lsa# mount
/dev/ide/host0/bus0/target0/lun0/part5 on / type ext2 (rw,errors=remount-ro)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/ide/host0/bus0/target0/lun0/part1 on /boot type ext3 (rw)
/dev/ide/host0/bus0/target0/lun0/part6 on /var type ext3 (rw)
/dev/ide/host0/bus0/target0/lun0/part3 on /var/log type ext3 (rw)
/dev/ide/host0/bus0/target0/lun0/part7 on /home type ext3 (rw)
/dev/ide/host0/bus0/target0/lun0/part8 on /data type ext3 (rw)
/dev/ide/host0/bus0/target1/lun0/part1 on /video type ext3 (rw,nosuid,nodev)
usbfs on /proc/bus/usb type usbfs (rw)
none on /sys type sysfs (rw)
/dev/scsi/host3/bus0/target0/lun0/part1 on /dimagex type vfat (rw)
smartass:/home/lsa# umount /dimagex/
Speicherzugriffsfehler
smartass:/home/lsa# umount /dimagex
umount: /dev/scsi/host3/bus0/target0/lun0/part1: Nicht gefunden
umount: /dimagex ist nicht eingehängt
umount: /dev/scsi/host3/bus0/target0/lun0/part1: Nicht gefunden
umount: /dimagex ist nicht eingehängt
smartass:/home/lsa# umount /dimagex
umount: /dimagex ist nicht eingehängt
smartass:/home/lsa# mount
/dev/ide/host0/bus0/target0/lun0/part5 on / type ext2 (rw,errors=remount-ro)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/ide/host0/bus0/target0/lun0/part1 on /boot type ext3 (rw)
/dev/ide/host0/bus0/target0/lun0/part6 on /var type ext3 (rw)
/dev/ide/host0/bus0/target0/lun0/part3 on /var/log type ext3 (rw)
/dev/ide/host0/bus0/target0/lun0/part7 on /home type ext3 (rw)
/dev/ide/host0/bus0/target0/lun0/part8 on /data type ext3 (rw)
/dev/ide/host0/bus0/target1/lun0/part1 on /video type ext3 (rw,nosuid,nodev)
usbfs on /proc/bus/usb type usbfs (rw)
none on /sys type sysfs (rw)

(sysfs not used anywhere, devfsd running)

dmesg output:

hub 3-0:1.0: new USB device on port 2, assigned address 5
scsi3 : SCSI emulation for USB Mass Storage devices
Vendor: MINOLTA Model: MINOLTA DIMAGE X Rev: 1.00
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sdd: 246016 512-byte hdwr sectors (126 MB)
sdd: Write Protect is off
sdd: Mode Sense: 00 1c 00 00
sdd: cache data unavailable
sdd: assuming drive cache: write through
/dev/scsi/host3/bus0/target0/lun0: p1
Attached scsi removable disk sdd at scsi3, channel 0, id 0, lun 0
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 5
usb 3-2: USB disconnect, address 5
Unable to handle kernel NULL pointer dereference at virtual address 00000010
printing eip:
e0b2dcc9
*pde = 00000000
Oops: 0000 [#1]
CPU: 0
EIP: 0060:[<e0b2dcc9>] Not tainted
EFLAGS: 00010286
EIP is at scsi_device_put+0x15/0x94 [scsi_mod]
eax: e0b47560 ebx: c0d85b40 ecx: e0b47574 edx: e0b47560
esi: 00000000 edi: 00000003 ebp: dffe108c esp: cc1fbee0
ds: 007b es: 007b ss: 0068
Process umount (pid: 24073, threadinfo=cc1fa000 task=d80486a0)
Stack: c0d85b40 00000000 e09de657 00000000 dffe1080 d813fb80 c01521de
dffe10cc
00000000 dffe10cc 00000000 dffe1280 cc1fa000 e09e1900 dffe128c c01521a4
dffe1080 00000003 dffe12cc 00000000 d62ba800 dffe1280 e0ac06c0 cc1fa000
Call Trace:
[<e09de657>] sd_release+0x3f/0x74 [sd_mod]
[<c01521de>] blkdev_put+0x18e/0x1b0
[<c01521a4>] blkdev_put+0x154/0x1b0
[<c0150f87>] kill_block_super+0x23/0x2c
[<c0150302>] deactivate_super+0x42/0x80
[<c016383c>] sys_umount+0x34/0x7c
[<c01410e6>] do_munmap+0x106/0x148
[<c016388f>] sys_oldumount+0xb/0x10
[<c010b577>] syscall_call+0x7/0xb

Code: 8b 46 10 8b 40 44 8b 00 85 c0 74 1f bb 00 e0 ff ff 21 e3 ff
<6>hub 3-0:1.0: new USB device on port 2, assigned address 6
scsi4 : SCSI emulation for USB Mass Storage devices
Vendor: MINOLTA Model: MINOLTA DIMAGE X Rev: 1.00
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sdd: 246016 512-byte hdwr sectors (126 MB)
sdd: Write Protect is off
sdd: Mode Sense: 00 1c 00 00
sdd: cache data unavailable
sdd: assuming drive cache: write through

(last lines are for reconnecting the USB camera).

then cat /proc/scsi/scsi just hangs forever.
2221 pts/0 S 0:00 | \_ /bin/bash
2953 pts/0 S 0:00 | | \_ bash
24399 pts/0 D 0:00 | | \_ cat /proc/scsi/scsi

# uname -a
Linux smartass 2.6.0-test7-1-386 #1 Sun Oct 12 10:29:56 EST 2003 i686 GNU/Linux

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