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

[Lee Revell]

On Mon, 2006-06-26 at 22:35 +0200, Pieter Palmers wrote:
> because you are not allowed to yield() in an RT context?
> 
> I wish I had been a little more elaborate on my initial mail, as it 
> would have saved us some time, and communication troubles (on my part 
> that is). I already spotted the msleep() change in the patch, and I 
> already tried reverting it. That gives you a nice new panic message, 
> something like 'BUG: yield()'ing in ...'.
> 
> I'm wondering why a patched, but not 'complete preemption' configured 
> kernel works fine. This change is present in them too, so it probably 
> has something to do with the msleep() implementation. 

Because I suspect that the change to tasklet_unlock_wait() was actually
responsible.

Did you add a printk() yet as I suggested in my last mail?

Once you add a printk to verify that it hangs in the while loop in
tasklet_unlock_wait() I think you have enough information for a bug
report.

Lee