lkml.org 
[lkml]   [2007]   [Jul]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [1/2] 2.6.22-rc7: known regressions
From
Date
On Thu, 2007-07-05 at 09:28 -0700, Linus Torvalds wrote:
>
> On Wed, 4 Jul 2007, David Woodhouse wrote:
> >
> > Oh, and here's another one for you. My Bluetooth mouse just stopped
> > working and hidd is deadlocked...
>
> Looks like it is stuck on hidp_session_sem.
>
> Nothing after 2.6.21 seems to have even touched that semaphore usage, and
> in fact there's not a whole lot of changes to the hidp code at all (and
> none of them look even remotely interesting).
>
> So I suspect it's something lower down in the bluetooth stack, or it's a
> long-standing problem that you are somehow able to trigger more easily
> now. Is it consistent?

It happened twice before I gave up on my 2.6.22-rc7 test kernel and went
back to something earlier. I suppose I should double-check that it
wasn't my slab changes, but I really don't think that's it.

> Can you showo the traces for the _other_ processes that are in bluetooth
> functions? Because there should be other processes there, holding that
> hidp_session_sem rwsem.

There was nothing, apart from a later 'hidd -l' which got stuck on the
same semaphore. I have an hcidump of it happening, at
http://david.woodhou.se/hidd-lockup-dump.txt -- it doesn't seem
particularly enlightening though. There's just a disconnection and
reconnect, as happens quite frequently with this mouse, and then we're
deadlocked. I'll build with hidp debugging.

--
dwmw2

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-07-05 18:45    [from the cache]
©2003-2011 Jasper Spaans