Hi,
On Wed, Feb 26, 2003 at 10:35:05AM -0800, Greg KH wrote:
> > However, it doesn't (yet) solve the real problem: if I disconnect the
> > scanner while the device file is openend and then write to the scanner
> > the kernel crashes.
>
> Where does it die? What's the oops output?
Actually the crash happens when I unplug the scanner while the device
is open. No need to write. Unplugging the device while not open works
and closing it works, too. Without your patch, noo crash on unplug
(but after unplug when I try to write).
Here is the oops from your patch (inclusing some messages from
plugging in/unplugging the scanner):
hub 1-2:0: debounce: port 4: delay 100ms stable 4 status 0x101
hub 1-2:0: new USB device on port 4, assigned address 3
drivers/usb/image/scanner.c: USB scanner device (0x055f/0x0001) now attached to
scanner0
usb 1-2.4: USB disconnect, address 3
hub 1-2:0: debounce: port 4: delay 100ms stable 4 status 0x101
hub 1-2:0: new USB device on port 4, assigned address 4
drivers/usb/image/scanner.c: USB scanner device (0x055f/0x0001) now attached to
scanner0
usb 1-2.4: USB disconnect, address 4
Unable to handle kernel NULL pointer dereference at virtual address 00000000
printing eip:
c01e1dd7
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0060:[<c01e1dd7>] Not tainted
EFLAGS: 00010082
EIP is at dl_reverse_done_list+0x163/0x194
eax: 00000000 ebx: dfd72080 ecx: dfd7b0c0 edx: 00000014
esi: dfd7b0e0 edi: df73f2bc ebp: c02b1efc esp: c02b1eb8
ds: 007b es: 007b ss: 0068
Process swapper (pid: 0, threadinfo=c02b0000 task=c027bde0)
Stack: dfbbb15e df73f2bc c1524eec dfbbb004 00000003 c0262c60 00000005 ffffff92
e0800010 dfe0e000 00000002 00000014 00000000 00000000 00000000 00000005
00000246 c02b1f2c c01e2c10 dfe0e000 c02b1f90 e0800014 c026324c 0000023a
Call Trace:
[<c01e2c10>] ohci_irq+0x130/0x1d8
[<c01d4305>] usb_hcd_irq+0x21/0x40
[<c0109cbf>] handle_IRQ_event+0x2b/0x50
[<c0109e3e>] do_IRQ+0x9e/0xf8
[<c0106dec>] default_idle+0x0/0x2c
[<c0105000>] rest_init+0x0/0x20
[<c0108bf8>] common_interrupt+0x18/0x20
[<c0106dec>] default_idle+0x0/0x2c
[<c0105000>] rest_init+0x0/0x20
[<c0106e12>] default_idle+0x26/0x2c
[<c0106e89>] cpu_idle+0x29/0x38
[<c010501c>] rest_init+0x1c/0x20
Code: ff 30 68 20 31 26 c0 e8 8d 3f f3 ff 8b 7d f4 83 c4 28 89 7b
<0>Kernel panic: Aiee, killing interrupt handler!
In interrupt handler - not syncing
SysRq works to some degree after that, I can reboot :-) Syncing
doesn't work however (yet another oops).
Any idea?
Bye,
Henning
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