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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Thomas Meyer <thomas@m3y3r.de>
Subject: Re: SwSusp to disk doesn't work - Try 2
Date: Sun, 11 Mar 2007 21:45:10 +0100
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Cc: Milan Broz <mbroz@redhat.com>, linux-kernel@vger.kernel.org,
       Pavel Machek <pavel@ucw.cz>, Thomas Gleixner <tglx@linutronix.de>
References: <45F44599.3060508@m3y3r.de> <200703112132.32753.rjw@sisk.pl> <45F46660.4010102@m3y3r.de>
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On Sunday, 11 March 2007 21:28, Thomas Meyer wrote:
> Rafael J. Wysocki schrieb:
> > On Sunday, 11 March 2007 21:23, Milan Broz wrote:
> >   
> >> Rafael J. Wysocki:
> >>     
> >>> Ah, NO_HZ.  Thomas Gleixner's address added to the Cc list.
> >>>
> >>>       
> >>>> short printk trace 
> >>>>
> >>>> enable_nonboot_cpus
> >>>>  _cpu_up
> >>>>   raw_notifier_callchain (CPU_UP_PREPARE)
> >>>>     ...
> >>>>     update_sched_domains
> >>>>      detach_destroy_domains
> >>>>        [waits here] --> synchronize_sched (==synchronize_rcu)
> >>>>         
> >>> Well, I think the call to wait_for_completion() does not return, probably
> >>> because the task supposed to complete the completion is frozen at this
> >>> point.  Can you please try to confirm that it gets stuck on
> >>> wait_for_completion() in synchronize_rcu()?
> >>>       
> >> Yes, it's in wait_for_completion() in synchronize_rcu().
> >> As noted in some previous mail, it will wake up after
> >> event - key press etc.
> >>
> >> Patch in http://lkml.org/lkml/2007/3/7/255 solves different problem.
> >> I added it to my quilt and applied anyway -> no change.
> >>     
> >
> > Does the problem go away if NO_HZ is unset?
> >   
> 
> i tried to boot with nohz=off, but the problem did persist.

Okay, but could you please compile the kernel without NO_HZ and retest?

Rafael