[linux-audio-dev] ieee1394 deadlock on RT kernels

[Pieter Palmers]

Lee Revell wrote:
> On Mon, 2006-06-26 at 21:05 +0200, Pieter Palmers wrote:
>> Lee Revell wrote:
>>> On Mon, 2006-06-26 at 16:51 +0200, Pieter Palmers wrote:
>>>>  
>>>> Of course. My monday-morning bad temper is over by now, and I hope I 
>>>> didn't transfer it to any of you. I'll provide the panic, one way or 
>>>> another.
>>>>
>>> Can you reproduce the problem on a non-RT kernel?
>>>
>> No, it only occurs with RT kernels, and only with those configured for 
>> PREEMPT_RT. If I use PREEMPT_DESKTOP, there is no problem. (with 
>> threaded IRQ's etc... only switched over the preemption level in the 
>> kernel config).
>>
>> I've uploaded the photo's of the panic here:
>> http://freebob.sourceforge.net/old/img_3378.jpg (without flash)
>> http://freebob.sourceforge.net/old/img_3377.jpg (with flash)
>>
>> both are of suboptimal quality unfortunately, but all info is readable 
>> on one or the other.
> 
> Can you add debug printk's before and after tasklet_kill() in
> ohci1394_unregister_iso_tasklet to see where it locks up?
> 
That's the first thing I did: the printk before tasklet_kill succeeds, 
the one right after the tasklet_kill doesn't.

Pieter