From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from out01.mta.xmission.com ([166.70.13.231]) by bombadil.infradead.org with esmtp (Exim 4.69 #1 (Red Hat Linux)) id 1MFShp-0003Ok-K3 for kexec@lists.infradead.org; Sat, 13 Jun 2009 12:51:40 +0000 References: <9c8decfb07c.00000038dseetharam@inbox.com> <913da90c6c8.0000039bdseetharam@inbox.com> <9E4E2F1EF78.00000173dseetharam@inbox.com> From: ebiederm@xmission.com (Eric W. Biederman) Date: Sat, 13 Jun 2009 05:51:25 -0700 In-Reply-To: <9E4E2F1EF78.00000173dseetharam@inbox.com> (Dharmosoth Seetharam's message of "Sat\, 13 Jun 2009 02\:22\:08 -0800") Message-ID: MIME-Version: 1.0 Subject: Re: /var/log/messages doesn't have crash info when kernel gets panic/oops/crash List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Dharmosoth Seetharam Cc: Neil Horman , vgoyal@in.ibm.com, kexec@lists.infradead.org, fastboot@lists.linux-foundation.org Dharmosoth Seetharam writes: >> -----Original Message----- >> From: ebiederm@xmission.com >> Sent: Sat, 13 Jun 2009 00:11:25 -0700 >> To: dseetharam@inbox.com >> Subject: Re: /var/log/messages doesn't have crash info when kernel gets >> panic/oops/crash >> >> Dharmosoth Seetharam writes: >> >>> Hi Neil, >>> >>> Thanks for your quick reply. >>> >>> What you have suggested is nice when we got/save crash dump (i.e vmcore) >>> What if we failed to save/capture vmcore info or vmcore is corrupted >>> etc. then we dont get any information >>> regarding the panic/crash/oops at anywhere? >> > Hi Eric, > >> Basic questions. >> 1) Do you have panic on oops set? >> I think that setting more than anything else will be the >> difference in what shows up in /var/log/messages. > > Yes, in my case panic_on_oops was set with 1 That is the reason thing don't show up in /var/log/messages because you panic before syslog has a chance to write the messages. >> 2) Have you tried a dry run and confirmed you can get a crash dump? > > No, I haven't tried this. It sounds like you have not been getting the coredumps when problems happen. Running a simple test run to Alt-sysrq-c to confirm that things are basically setup ok is a good idea. >> 3) Are you using kvm > kvm? kernel virtual memory? Kernel virtual machine. In particular. Hardware acceleration for virtual machines. Eric _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec