linux-kernel - Re: SwSusp to disk doesn't work

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Message-ID: <45F46530.8050005@redhat.com>
Date:	Sun, 11 Mar 2007 21:23:12 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Thomas Meyer <thomas@...3r.de>, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: SwSusp to disk doesn't work - Try 2

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.

Milan

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