linux-kernel - [patch] Re: RCU?: Scheduling while atomic with 3.4.23-rt33

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Date:	Mon, 18 Feb 2013 13:40:15 +0100
From:	"Tim Sander" <tim.sander@....com>
To:	"Thomas Gleixner" <tglx@...utronix.de>
Cc:	"linux-rt-users" <linux-rt-users@...r.kernel.org>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"Steven Rostedt" <rostedt@...dmis.org>
Subject: [patch] Re: RCU?: Scheduling while atomic with 3.4.23-rt33

Am Montag, 18. Februar 2013, 12:16:41 schrieb Thomas Gleixner:
> On Mon, 18 Feb 2013, Tim Sander wrote:
> > Here is a transtribed backtrace for easier reading:
> > c0010fac t dump_backtrace
> > c022c188 T dump_stack
> > c022c71c t __schedule_bug
> > c022fb28 t __schedule
> > c0230644 t rt_spin_lock_slowlock
> > c0230ba8 T rt_spin_lock
> > c003a9b8 T __wake_up
> > c0052a44 t invoke_rcu_callbacks
> > c0053764 T rcu_check_callbacks
> > c0026060 T update_process_times
> 
> That's due to CONFIG_TINY_PREEMPT_RCU=y. That's a known issue, which
> has been fixed in 3.6-rt.
> 
> Steven, could you backport that to 3.2/3.4 please ?
As far as i see its been the waitequeue stuff. The patch below is the patch 
from 3.6. backported to 3.4.


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View attachment "0022-rcutiny-Use-simple-waitqueue.patch" of type "text/x-patch" (2484 bytes)