Hi Matt,
When running some storage tests, a couple of times I've gotten
oopses. Attached is 'dmesg' output for one sequence ... another
was in_irq (dead box), with the usb_storage_queuecommand() null
pointer getting triggered on the khubd usb_device_remove() path.
Seems like for some reason the host would get driven off-line
(electrical loading? VIA roothub wierdness?) and the cleanup
(new code) didn't happen as it should ... this is basically
that "unplug during disk i/o" case, except that I didn't do
anything to the cable.
I thought you should know about this ...
- Dave
hub 2-0:0: new USB device on port 1, assigned address 2
usb 2-1: new device strings: Mfr=73, Product=90, SerialNumber=110
usb 2-1: Product: USB Storage Adapter
usb 2-1: Manufacturer: In-System Design
usb 2-1: SerialNumber: 000000003045
drivers/usb/core/usb.c: usb_hotplug
usb 2-1: usb_new_device - registering interface 2-1:0
usb-storage 2-1:0: usb_device_probe
usb-storage 2-1:0: usb_device_probe - got id
scsi0 : SCSI emulation for USB Mass Storage devices
Vendor: QUANTUM Model: FIREBALLlct1 Rev: A03.
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sda: 20044080 512-byte hdwr sectors (10263 MB)
sda: asking for cache data failed
sda: assuming drive cache: write through
sda: sda1
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 2
drivers/usb/core/usb.c: usb_hotplug
ehci-hcd 00:0c.2: GetStatus port 1 status 001803 POWER sig=j CSC CONNECT
hub 2-0:0: port 1, status 501, change 1, 480 Mb/s
usb 2-1: USB disconnect, address 2
usb 2-1: unregistering interfaces
drivers/usb/core/usb.c: usb_hotplug
SCSI device not inactive - rq_status=1, target=0, pid=73094, state=4099, owner=258.
drivers/scsi/hosts.c:245: spin_is_locked on uninitialized spinlock dfd4f4e8.
Device busy???
------------[ cut here ]------------
kernel BUG at drivers/usb/storage/usb.c:981!
invalid operand: 0000
CPU: 0
EIP: 0060:[<e0860931>] Not tainted
EFLAGS: 00010202
EIP is at storage_disconnect+0x211/0x1f79f8e0 [usb_storage]
eax: 00000001 ebx: d0957a00 ecx: 00000001 edx: dfd4f4a4
esi: d0957a00 edi: e0864040 ebp: d0935e88 esp: d0935e80
ds: 007b es: 007b ss: 0068
Process khubd (pid: 1381, threadinfo=d0934000 task=d0fba9c0)
Stack: e08640dc d08f7ad4 d0935ea8 e0870293 d08f7ad4 00000001 e0864040 d08f7aec
e0864058 d08f7aec d0935ebc c01e7d76 d08f7aec e088cae0 e088cb20 d0935ed4
c01e7edb d08f7aec c02aab94 d08f7aec d081bce0 d0935ef4 c01e72ca d08f7aec
Call Trace:
[<e08640dc>] usb_storage_driver+0x9c/0x1f79bfc0 [usb_storage]
[<e0870293>] usb_device_remove+0xe3/0x1f78fe50 [usbcore]
[<e0864040>] usb_storage_driver+0x0/0x1f79bfc0 [usb_storage]
[<e0864058>] usb_storage_driver+0x18/0x1f79bfc0 [usb_storage]
[<c01e7d76>] device_release_driver+0x46/0x60
[<e088cae0>] usb_bus_type+0x0/0x1f773520 [usbcore]
[<e088cb20>] usb_bus_type+0x40/0x1f773520 [usbcore]
[<c01e7edb>] bus_remove_device+0x5b/0xb0
[<c01e72ca>] device_del+0x6a/0xa0
[<c01e730d>] device_unregister+0xd/0x1a
[<e0870c84>] usb_disconnect+0xc4/0x1f78f440 [usbcore]
[<e0873b1b>] usb_hub_port_connect_change+0xab/0x1f78c590 [usbcore]
[<e0874007>] usb_hub_events+0x287/0x1f78c280 [usbcore]
Code: 0f 0b d5 03 31 15 86 e0 8d 65 f8 5b 5e 5d c3 ff b3 c0 00 00
<1>Unable to handle kernel NULL pointer dereference at virtual address 000000cc
printing eip:
e085d028
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0060:[<e085d028>] Not tainted
EFLAGS: 00010046
EIP is at usb_storage_queuecommand+0x18/0x1f7a2ff0 [usb_storage]
eax: dfd4f4a4 ebx: dfd4f4a4 ecx: d08dc084 edx: 00000000
esi: d086fed4 edi: 00000296 ebp: d086fe90 esp: d086fe90
ds: 007b es: 007b ss: 0068
Process scsi_eh_0 (pid: 1479, threadinfo=d086e000 task=d0fb8940)
Stack: d086ff18 c022f6b4 d08dc084 c022f4b0 d086fedc d081bce0 00002002 00000000
00000000 1d244b3c 00000000 0000000a c02c3c2b 00000000 00000000 d086fefc
d086fefc c02c3c2b dfad0adc 00000000 00000000 1d244b3c 00000000 0000000a
Call Trace:
[<c022f6b4>] scsi_send_eh_cmnd+0x1b4/0x5e0
[<c022f4b0>] scsi_eh_done+0x0/0x50
[<c022ff9a>] scsi_eh_tur+0x7a/0xb0
[<c022fe6c>] scsi_try_to_abort_cmd+0x11c/0x1d0
[<c022fffa>] scsi_eh_abort_cmd+0x2a/0x60
[<c0230d34>] scsi_unjam_host+0x34/0xc0
[<c02311b8>] scsi_error_handler+0x3f8/0x460
[<c0230dc0>] scsi_error_handler+0x0/0x460
[<c0107369>] kernel_thread_helper+0x5/0xc
Code: 8b 82 cc 00 00 00 48 74 08 0f 0b 95 00 60 19 86 e0 8b 82 c4
<6>note: scsi_eh_0[1479] exited with preempt_count 1
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