Messages in this thread | | | Date | Fri, 18 Jan 2013 09:35:16 -0800 | From | "Paul E. McKenney" <> | Subject | Re: INFO: rcu_bh detected stall on CPU 3 (t=0 jiffies) |
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On Sun, Jan 13, 2013 at 04:13:51AM +0000, Ben Hutchings wrote: > On Wed, 2013-01-02 at 19:49 -0500, Steven Rostedt wrote: > > On Wed, 2013-01-02 at 13:29 -0800, Paul E. McKenney wrote: > > > On Wed, Jan 02, 2013 at 03:56:30PM -0500, Steven Rostedt wrote: > > > > On Wed, Jan 02, 2013 at 08:09:20PM +0100, Ralf Hildebrandt wrote: > > > > > This happened of a virtual guest (Linux mail 3.2.0-35-virtual #55-Ubuntu SMP Wed Dec 5 18:02:05 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux) > > > > > > > > 3.2 is rather old and this looks to be a stock Ubuntu kernel. May want > > > > to file a Bugzilla (or whatever they call it) with them. > > > > > > > > > > > > > > Jan 2 13:24:08 mail kernel: [3531872.484283] INFO: rcu_bh detected stall on CPU 3 (t=0 jiffies) > > > > > > > > 0 jiffies? > > > > > > One possibility is that they are missing commit a10d206e (rcu: Fix > > > day-one dyntick-idle stall-warning bug), at least assuming that > > > CONFIG_PREEMPT=n. This went into 3.6, IIRC. > > > > If that does fix the issue, we probably should send that off to Ben for > > inclusion into 3.2 stable. > > If I read the Ubuntu changelog correctly, Ralf's machine is running a > version based on 3.2.34, which already has this change (I applied it in > 3.2.32).
OK, another possibility is c8020a67. Ralf, if that does not help, is it possible for you to run either a 3.7 or a -rcu kernel [*]? There are some other fixes that could be related, but the probability seems low.
Thanx, Paul
[*] git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git branch rcu/next
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