linux-kernel - Re: Help needed: Resume problems in 2.6.32-rc, perhaps related to preempt

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Date:	Mon, 9 Nov 2009 13:49:37 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, Greg KH <gregkh@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: Help needed: Resume problems in 2.6.32-rc, perhaps related to
 preempt_count leakage in keventd


* Rafael J. Wysocki <rjw@...k.pl> wrote:

> On Monday 09 November 2009, Ingo Molnar wrote:
> > 
> > * Rafael J. Wysocki <rjw@...k.pl> wrote:
> > 
> > > [ 2016.865041] BUG: using smp_processor_id() in preemptible [00000000] code: events/1/29920                                                                                         
> > > [ 2016.865344] caller is vmstat_update+0x13/0x48                                          
> > > [ 2016.865522] Pid: 29920, comm: events/1 Not tainted 2.6.31-tst #158                     
> > > [ 2016.865700] Call Trace:                                                                
> > > [ 2016.865877]  [<ffffffff811608e8>] debug_smp_processor_id+0xc4/0xd4                     
> > > [ 2016.866052]  [<ffffffff810a9ae1>] vmstat_update+0x13/0x48                              
> > > [ 2016.866232]  [<ffffffff81051ee6>] worker_thread+0x18b/0x22a                            
> > > [ 2016.866409]  [<ffffffff810a9ace>] ? vmstat_update+0x0/0x48                             
> > > [ 2016.866578]  [<ffffffff810556a5>] ? autoremove_wake_function+0x0/0x38                  
> > > [ 2016.866749]  [<ffffffff81288803>] ? _spin_unlock_irqrestore+0x35/0x37                  
> > > [ 2016.866935]  [<ffffffff81051d5b>] ? worker_thread+0x0/0x22a                            
> > > [ 2016.867113]  [<ffffffff8105547d>] kthread+0x69/0x71                                    
> > > [ 2016.867278]  [<ffffffff8100c1aa>] child_rip+0xa/0x20                                   
> > > [ 2016.867450]  [<ffffffff81055414>] ? kthread+0x0/0x71                                   
> > > [ 2016.867618]  [<ffffffff8100c1a0>] ? child_rip+0x0/0x20                                 
> > 
> > a bug producing similar looking messages was fixed by:
> > 
> >   fd21073: sched: Fix affinity logic in select_task_rq_fair()
> > 
> > but that bug was introduced by:
> > 
> >   a1f84a3: sched: Check for an idle shared cache in select_task_rq_fair()
> 
> I guess these are tip commits?

yep, tip:sched/core ones.

> > Which is for v2.6.33, not v2.6.32.
> 
> The one I saw was in the Linus' tree, quite obviously.

ok, then my observation should not apply.

	Ingo
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