When I did alt sysrq c nothing changed on screen. I had to use the hardware button for shut down. In /var/log/ the syslog file extract is below. The first start at 7;00am till it froze at 7;33 is missing.The restart at 7:38 appeared as normal in this log while as it froze again I had to restart using hardware button. Jul 10 07:35:47 mohanvc-desktop syslogd 1.5.0#1ubuntu1: restart. Jul 10 07:35:47 mohanvc-desktop anacron[5447]: Job `cron.daily' terminated Jul 10 07:35:47 mohanvc-desktop anacron[5447]: Normal exit (1 job run) Jul 10 07:38:04 mohanvc-desktop syslogd 1.5.0#1ubuntu1: restart. Jul 10 07:38:04 mohanvc-desktop kernel: Inspecting /boot/System.map-2.6.24-19-generic Jul 10 07:38:04 mohanvc-desktop kernel: Loaded 27883 symbols from /boot/System.map-2.6.24-19-generic. Jul 10 07:38:04 mohanvc-desktop kernel: Symbols match kernel version 2.6.24. Jul 10 07:38:04 mohanvc-desktop kernel: Loaded 19558 symbols from 87 modules. Jul 10 07:38:04 mohanvc-desktop kernel: [ 0.000000] Initializing cgroup subsys cpuset
On Thu, Jul 10, 2008 at 3:32 PM, Saifi Khan <[EMAIL PROTECTED]> wrote: > On Thu, 10 Jul 2008, V.C.Mohan wrote: > > > Date: Thu, 10 Jul 2008 08:05:23 +0530 > > From: V.C.Mohan <[EMAIL PROTECTED] <mohanvc%40gmail.com>> > > Reply-To: [email protected] <twincling%40yahoogroups.com> > > To: [email protected] <twincling%40yahoogroups.com> > > Subject: Re: [twincling] UBUNTU8.04 problems (fwd) > > > > > Today I had the freeze situation twice. I did the alt, sysrq, c as > suggested > > by you. Where does this dump recorded? I did a search but could not > locate any. > > > > Need help suggestions. > > mohan > > > > Hi Mohan: > > Here is a strategy which is useful across most Linux distributions. > > 1. one would like to have clean shutdown (stop all programs, > unmount all drives) and reboot. This is to avoid the fsck > checks et' al. > > Hold down ALT key and SysRq (Print Screen) key together > (if you are using laptop then - ALT + [fn] + SysRq key) > and then type the characters R E I S U B > Once the last character 'B' is typed the system will reboot. > > Please note that this requires that the kernel has been compiled > with CONFIG_MAGIC_SYSRQ option. > > 2. in case you want to do crash dump analysis, you need to have > - kexec support enabled in kernel > - kexec-tools installed > - lcrash utility > - dump partition/file (/var/log/dump) > > Now, when you run the following key press sequence > > ALT + SysRq (Print Screen) + c > > Reboot kexec is applied and a crash dump is written > to /var/log/dump > > These are two approaches i have used on OpenSuSe and Gentoo Linux. > > thanks > Saifi. >
