Re: [Spca50x-devs] spca triggering kernel Bug kernel/softirq.c:266
- Date: Sat, 18 Mar 2006 22:03:11 +0100
- From: thomas schorpp <t.schorpp@xxxxxx>
- Subject: Re: [Spca50x-devs] spca triggering kernel Bug kernel/softirq.c:266
Florian Lohoff wrote:
> 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..
>
finally what weve been waiting for, thx.
suggest merging the bug with: References: <43CF43CE.7060404@xxxxxx> <200603111055.56215.mxhaard@xxxxxxxx> <4412F367.3090100@xxxxxx> <200603112237.27307.mxhaard@xxxxxxxx>
In-Reply-To: <200603112237.27307.mxhaard@xxxxxxxx>
i cant reproduce it here, since im getting full lockup without any traces on touching my cam
under the mentioned cicumstances.
could you compile a kernel image with all debug features and provide a more verbose stacktrace
or use ksymoops to get something out of this binary trace?
this stacktrace doesnt say enough to identify this tasklet bug.
i check the spca5xx tasklet code meanwhile...
y
tom
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