From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id A454FB70D8 for ; Sat, 14 Aug 2010 09:44:44 +1000 (EST) Subject: Re: help with kernel panics in task swapper on 460ex From: Benjamin Herrenschmidt To: Ayman El-Khashab In-Reply-To: <20100813203636.GA11899@crust.elkhashab.com> References: <20100813203636.GA11899@crust.elkhashab.com> Content-Type: text/plain; charset="UTF-8" Date: Sat, 14 Aug 2010 09:44:31 +1000 Message-ID: <1281743071.2987.411.camel@pasglop> Mime-Version: 1.0 Cc: linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Fri, 2010-08-13 at 15:36 -0500, Ayman El-Khashab wrote: > > The exact details (though I don't think they are too useful are as follows. > The one interesting item if I read it correctly, is that the CPU was > trying to get instructions from c002xxxx address. However, this board only > has 512MB of memory so it seems that the address (if it is physical) isn't > valid. Actually this is a perfectly valid virtual address. The kernel maps memory at 0xc0000000 (at least the first 768M of it, the rest is dynamically mapped in/out). > Are there any tricks we can use to analyze this problem? Or is there any > information we can collect to help pinpoint where this issue might lie? Well, xmon is your friend ... Ben.