Re: BUG: sleeping function called from invalid context atkernel/mutex.c:271

From: Alexander E. Patrakov
Date: Wed Apr 18 2012 - 09:44:05 EST

Steven Rostedt wrote:
> On Wed, 2012-04-18 at 10:51 +0600, Alexander E. Patrakov wrote:
> > > >
> > > > Hmm, this can also be reported if you have an rcu leak. Which would also
> > > > explain your memory leak. RCU is the kernel's "garbage collector" and if
> > > > it gets stuck, then you will definitely start seeing memory leaks, as
> > > > memory wont be freed.
> > >
> > > If RCU is stuck, you should see RCU CPU stall warnings, which can
> > > give clues as to what is causing RCU to get stuck.
> >
> > Yes, there were such warnings, but all of them said that the stall ended
> > before dump start. So nothing reportable here, but I have just found
> > that looks quite
> > similar in the sense that it (and duplicates) also has undumpable stalls
> > of increasing length, and IPv6 is in use both at home and at work.
> >
> Do you see the RT throttling message too? That's a bug with an RT task
> going haywire. If that is happening, an RT task may be preventing an RCU
> grace period to finish, and causing the RCU stalls.

I am currently at home, writing this from a laptop with 3.3.1, and there
are no such messages in dmesg (yet?). Also I don't know any RT tasks
that may run on my computer, except pulseaudio, which has a built-in
safeguard against this. As for the work computer, should I check
tomorrow, and with which kernel version?

Alexander E. Patrakov

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