From owner-freebsd-hackers@FreeBSD.ORG  Thu Jul 18 18:42:55 2013
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From: John Baldwin <jhb@freebsd.org>
To: Yuri <yuri@rawbw.com>
Subject: Re: Kernel crashes after sleep: how to debug?
Date: Thu, 18 Jul 2013 14:42:35 -0400
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Cc: Alan Cox <alc@freebsd.org>, freebsd-hackers@freebsd.org
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On Thursday, July 18, 2013 2:15:48 pm Yuri wrote:
> On 07/16/2013 08:07, John Baldwin wrote:
> > Can you go to frame 8 and do 'l' in kgdb?
> 
> (kgdb) up 8
> #8  0xffffffff80baea78 in vm_pageout () at /usr/src/sys/vm/vm_pageout.c:829
> 829                     if (!VM_OBJECT_TRYLOCK(object) &&
> (kgdb) l
> 824                     if (!vm_pageout_page_lock(m, &next)) {
> 825                             vm_page_unlock(m);
> 826                             continue;
> 827                     }
> 828                     object = m->object;
> 829                     if (!VM_OBJECT_TRYLOCK(object) &&
> 830                         !vm_pageout_fallback_object_lock(m, &next)) {
> 831                             vm_page_unlock(m);
> 832                             VM_OBJECT_UNLOCK(object);
> 833                             continue;

Hmm, so this seems to indicate you have a page on the active queue that 
doesn't have an associated VM object.  Can you maybe 'p *m'?  Maybe some
temporary page is allocated during suspend but isn't freed appropriately?

-- 
John Baldwin