Re: rcu_sched stall detected, but no state dump

2014-12-22 Thread Paul E. McKenney
On Mon, Dec 22, 2014 at 01:42:14PM +0100, Miroslav Benes wrote: > On Fri, 19 Dec 2014, Paul E. McKenney wrote: > > On Fri, Dec 19, 2014 at 12:09:48PM +0100, Miroslav Benes wrote: [ . . . ] > > But what do you do if your test module happens to start spinning when > > there is no callback? > > > >

Re: rcu_sched stall detected, but no state dump

2014-12-22 Thread Miroslav Benes
On Fri, 19 Dec 2014, Paul E. McKenney wrote: > On Fri, Dec 19, 2014 at 12:09:48PM +0100, Miroslav Benes wrote: > > On Mon, 15 Dec 2014, Miroslav Benes wrote: > > > > > On Fri, 12 Dec 2014, Paul E. McKenney wrote: > > > > > > > On Fri, Dec 12, 2014 at 03:06:20PM +0100, Miroslav Benes wrote: > > >

Re: rcu_sched stall detected, but no state dump

2014-12-21 Thread Paul E. McKenney
On Fri, Dec 19, 2014 at 07:32:20AM -0800, Paul E. McKenney wrote: > On Fri, Dec 19, 2014 at 12:09:48PM +0100, Miroslav Benes wrote: > > On Mon, 15 Dec 2014, Miroslav Benes wrote: [ . . . ] > > But I'm not sure whether it is possible that the list of pending callback > > is empty. Maybe the bug i

Re: rcu_sched stall detected, but no state dump

2014-12-19 Thread Paul E. McKenney
On Fri, Dec 19, 2014 at 12:09:48PM +0100, Miroslav Benes wrote: > On Mon, 15 Dec 2014, Miroslav Benes wrote: > > > On Fri, 12 Dec 2014, Paul E. McKenney wrote: > > > > > On Fri, Dec 12, 2014 at 03:06:20PM +0100, Miroslav Benes wrote: > > > > > [...] > > > > > One last thing. Is there a reason

Re: rcu_sched stall detected, but no state dump

2014-12-19 Thread Miroslav Benes
On Mon, 15 Dec 2014, Miroslav Benes wrote: > On Fri, 12 Dec 2014, Paul E. McKenney wrote: > > > On Fri, Dec 12, 2014 at 03:06:20PM +0100, Miroslav Benes wrote: > > [...] > > > One last thing. Is there a reason that there is not any similar INFO in > > > the console for tiny implementation? I

Re: rcu_sched stall detected, but no state dump

2014-12-16 Thread Paul E. McKenney
On Mon, Dec 15, 2014 at 02:26:30PM +0100, Miroslav Benes wrote: > On Fri, 12 Dec 2014, Paul E. McKenney wrote: > > > On Fri, Dec 12, 2014 at 03:06:20PM +0100, Miroslav Benes wrote: > > > On Thu, 11 Dec 2014, Paul E. McKenney wrote: > > > > > > > On Thu, Dec 11, 2014 at 08:50:10AM -0800, Paul E. M

Re: rcu_sched stall detected, but no state dump

2014-12-15 Thread Miroslav Benes
On Fri, 12 Dec 2014, Paul E. McKenney wrote: > On Fri, Dec 12, 2014 at 03:06:20PM +0100, Miroslav Benes wrote: > > On Thu, 11 Dec 2014, Paul E. McKenney wrote: > > > > > On Thu, Dec 11, 2014 at 08:50:10AM -0800, Paul E. McKenney wrote: > > > > On Thu, Dec 11, 2014 at 10:35:15AM +0100, Miroslav Be

Re: rcu_sched stall detected, but no state dump

2014-12-12 Thread Paul E. McKenney
On Fri, Dec 12, 2014 at 03:06:20PM +0100, Miroslav Benes wrote: > On Thu, 11 Dec 2014, Paul E. McKenney wrote: > > > On Thu, Dec 11, 2014 at 08:50:10AM -0800, Paul E. McKenney wrote: > > > On Thu, Dec 11, 2014 at 10:35:15AM +0100, Miroslav Benes wrote: > > > > On Wed, 10 Dec 2014, Paul E. McKenney

Re: rcu_sched stall detected, but no state dump

2014-12-12 Thread Miroslav Benes
On Thu, 11 Dec 2014, Paul E. McKenney wrote: > On Thu, Dec 11, 2014 at 08:50:10AM -0800, Paul E. McKenney wrote: > > On Thu, Dec 11, 2014 at 10:35:15AM +0100, Miroslav Benes wrote: > > > On Wed, 10 Dec 2014, Paul E. McKenney wrote: > > > > > > > On Wed, Dec 10, 2014 at 01:52:02PM +0100, Miroslav

Re: rcu_sched stall detected, but no state dump

2014-12-11 Thread Paul E. McKenney
On Thu, Dec 11, 2014 at 08:50:10AM -0800, Paul E. McKenney wrote: > On Thu, Dec 11, 2014 at 10:35:15AM +0100, Miroslav Benes wrote: > > On Wed, 10 Dec 2014, Paul E. McKenney wrote: > > > > > On Wed, Dec 10, 2014 at 01:52:02PM +0100, Miroslav Benes wrote: > > > > > > > > Hi, > > > > > > > > today

Re: rcu_sched stall detected, but no state dump

2014-12-11 Thread Paul E. McKenney
On Thu, Dec 11, 2014 at 10:35:15AM +0100, Miroslav Benes wrote: > On Wed, 10 Dec 2014, Paul E. McKenney wrote: > > > On Wed, Dec 10, 2014 at 01:52:02PM +0100, Miroslav Benes wrote: > > > > > > Hi, > > > > > > today I came across RCU stall which was correctly detected, but there is > > > no stat

Re: rcu_sched stall detected, but no state dump

2014-12-11 Thread Miroslav Benes
On Wed, 10 Dec 2014, Paul E. McKenney wrote: > On Wed, Dec 10, 2014 at 01:52:02PM +0100, Miroslav Benes wrote: > > > > Hi, > > > > today I came across RCU stall which was correctly detected, but there is > > no state dump. This is a bit suspicious, I think. > > > > This is the output in seria

Re: rcu_sched stall detected, but no state dump

2014-12-10 Thread Paul E. McKenney
On Wed, Dec 10, 2014 at 01:52:02PM +0100, Miroslav Benes wrote: > > Hi, > > today I came across RCU stall which was correctly detected, but there is > no state dump. This is a bit suspicious, I think. > > This is the output in serial console: > > [ 105.727003] INFO: rcu_sched detected stalls

rcu_sched stall detected, but no state dump

2014-12-10 Thread Miroslav Benes
Hi, today I came across RCU stall which was correctly detected, but there is no state dump. This is a bit suspicious, I think. This is the output in serial console: [ 105.727003] INFO: rcu_sched detected stalls on CPUs/tasks: [ 105.727003] (detected by 0, t=21002 jiffies, g=3269, c=3268, q