linux-kernel - Re: BUG: sleeping function called from invalid context at kernel/mutex.c:271

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Date:	Wed, 18 Apr 2012 19:45:57 +0600
From:	"Alexander E. Patrakov" <patrakov@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org
Subject: Re: BUG: sleeping function called from invalid context at
 kernel/mutex.c:271

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 https://bugzilla.novell.com/show_bug.cgi?id=754186 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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