rtmutex assert failure (was [Patch] restore the RCU callback...)

On Mon, Aug 21, 2006 at 05:21:35PM -0700, Robert Crocombe wrote:
On 8/18/06, hui Bill Huey <billh@xxxxxxxxxxxxxxxxx> wrote:
Patch attached:

The problem still appears to happen, but now I get no trace at all,
just a single line reported to the machine's console (and not on the
serial console):

pdflush/314[CPU#2]: BUG in debug_rt_mutex_unlock at
kernel/rt_mutex_debug.c:471

i.e., a standard statement, except at pdflush instead of swapper this time.

Thanks for testing. I appreciate this and I'm more than just plain willing
to help out. Any thing goes to get this patch solid. :)

I'll come up with a patch tomorrow to try and get a clean stack trace. I've
made some change to the bug dump output to make it more preemption aware,
but, as you can, some tweeking is needed.

However, I don't think this is going to be a simple atomic violation problem
that I've seen numerous times before. That's what the previous patch tried to
address. It's seriously pointing to a problem with the rtmutex and/or how it's
used, maybe a corner case it's missing.

I'll start to look at it either tonight or tomorrow and see what's going on.
It's going to take me a bit so be patient. I'll definitely get back to you
on this. I've got a number of weeks to blow exclusively on -rt development,
so I'll be around for a little while longer, hopefully longer.

bill

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