[Spca50x-devs] spca triggering kernel Bug kernel/softirq.c:266

[Florian Lohoff <flo@xxxxxxxxxx>]

Hi,
i am seeing this kernel Bug as soon as i start touching the
spca5xx based cam. Kernel tried so far are 2.6.15 and 2.6.16-rc6
without preemption, UP, PII 266Mhz.

kernel/softirq.c
    263                 if (tasklet_trylock(t)) {
    264                         if (!atomic_read(&t->count)) {
    265                                 if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
    266                                         BUG();
    267                                 t->func(t->data);
    268                                 tasklet_unlock(t);
    269                                 continue;
    270                         }
    271                         tasklet_unlock(t);
    272                 }

Cam is a

0ac8:301b Z-Star Microelectronics Corp. ZC0301 WebCam

Source is 20060202 from Debian thus i opened a Debian bug against the
spca5xx-source package.

------------[ cut here ]------------
kernel BUG at kernel/softirq.c:266!
invalid operand: 0000 [#1]
Modules linked in: spca5xx videodev uhci_hcd usbcore
CPU:    0
EIP:    0060:[<c01190fc>]    Not tainted VLI
EFLAGS: 00010246   (2.6.15-netstation)
EIP is at tasklet_action+0x2c/0x60
eax: 00000000   ebx: c22fc008   ecx: 00000028   edx: c22fc008
esi: c03c71e8   edi: 00000009   ebp: 0040d007   esp: c0393f90
ds: 007b   es: 007b   ss: 0068
Process swapper (pid: 0, threadinfo=c0392000 task=c033fb00)
Stack: 00000001 c0118ee3 c03c71e8 00000046 00059100 c038c800 c0118f16 c0392000
       c0104e8f c010386a c0392000 00000000 c0392000 00059100 c038c800 0040d007
       00000000 0000007b 0000007b ffffff0b c0100ba3 00000060 00000246 c0100c3c
Call Trace:
 [<c0118ee3>] __do_softirq+0x83/0x90
 [<c0118f16>] do_softirq+0x26/0x30
 [<c0104e8f>] do_IRQ+0x1f/0x30
 [<c010386a>] common_interrupt+0x1a/0x20
 [<c0100ba3>] default_idle+0x33/0x60
 [<c0100c3c>] cpu_idle+0x4c/0x60
 [<c0394796>] start_kernel+0x166/0x1a0
Code: fa 8b 1d a0 71 3c c0 c7 05 a0 71 3c c0 00 00 00 00 fb 85 db 74 29 89 da 8b 1b 8b 42 08 85 c0 75 20 0f b3 42 04 19 c0 85 c0 75 08 <0f> 0b 0a 01 23 15 30 c0 8b 42 10 50 ff 52 0c 58 85 db 75 d7 5b
 <0>Kernel panic - not syncing: Fatal exception in interrupt
 <0>Rebooting in 5 seconds..

-- 
Florian Lohoff                  flo@xxxxxxxxxx             +49-171-2280134
                        Heisenberg may have been here.

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