From owner-freebsd-stable  Fri Oct 27  8:59:12 2000
Delivered-To: freebsd-stable@freebsd.org
Received: from fw.wintelcom.net (ns1.wintelcom.net [209.1.153.20])
	by hub.freebsd.org (Postfix) with ESMTP id 7D9A337B479
	for <freebsd-stable@FreeBSD.ORG>; Fri, 27 Oct 2000 08:59:08 -0700 (PDT)
Received: (from bright@localhost)
	by fw.wintelcom.net (8.10.0/8.10.0) id e9RFx6K00908;
	Fri, 27 Oct 2000 08:59:06 -0700 (PDT)
Date: Fri, 27 Oct 2000 08:59:06 -0700
From: Alfred Perlstein <bright@wintelcom.net>
To: Michael Bacarella <mbac@mmap.nyct.net>
Cc: freebsd-stable@FreeBSD.ORG
Subject: Re: vm_page_remove() problem..
Message-ID: <20001027085906.X28123@fw.wintelcom.net>
References: <20001027111723.A9057@mmap.nyct.net>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.2.4i
In-Reply-To: <20001027111723.A9057@mmap.nyct.net>; from mbac@mmap.nyct.net on Fri, Oct 27, 2000 at 11:17:23AM -0400
Sender: owner-freebsd-stable@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

A crashdump would be a lot more helpful.  see: 
http://www.freebsd.org/handbook/kerneldebug.html

-Alfred

* Michael Bacarella <mbac@mmap.nyct.net> [001027 08:19] wrote:
> This keeps happening to one of our multiprocessor servers. About twice
> a day.
> 
> panic: vm_page_remove(): page not found in hash
> mp_lock = 01000001; cpuid = 1; lapic.id = 01000000
> boot() called on cpu#1
> 
> syncing disks... 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 68 
> giving up on 67 buffers
> Uptime: 21h28m53s
> Automatic reboot in 15 seconds - press a key on the console to abort
> Rebooting...
> cpu_reset called on cpu#1
> cpu_reset: Stopping other CPUs
> cpu_reset: Restarting BSP
> cpu_reset_proxy: Grabbed mp lock for BSP
> cpu_reset_proxy: Stopped CPU 1
> 
> FreeBSD bsd10.nyct.net 4.1.1-STABLE FreeBSD 4.1.1-STABLE #0: Fri Oct 20 15:58:40 EDT 2000     myj@bsd6.nyct.net:/usr/obj/usr/src/sys/NYCT  i386
> 
> We've tweaked some variables in response to this (maxusers?) but it
> doesn't seem to do the trick.
> 
> It happens most when I do something memory intensive (like stopping and
> restarting apache, and all several-hundred children), but it really does
> happen quite randomly.
> 
> My wild uneducated guess is that both processors are calling vm_page_remove()
> on a page and the one that doesn't happen first ends up panic'ing because
> it can't find the page anymore.
> 
> We're in the process of trying it with a non-SMP kernel, but I figure I'd
> put this out early in any case as it's obviously a bug of some kind. If
> I really find myself at the end of a rope, I'm going to look to see if it's
> a hardware problem.
> 
> Thanks
> 
> -- 
> Michael Bacarella <mbac@mmap.nyct.net>	;finger address for public key
> GPG Key Fingerprint: B4E4 82F5 BCAC AB83 E6F7  B5AA 933E 2A75 79A4 A9C1
> 
> 
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-stable" in the body of the message

-- 
-Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]
"I have the heart of a child; I keep it in a jar on my desk."


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-stable" in the body of the message