Re: [kernel panic @ reboot] 2.6.0-test10-mm1

[Randy.Dunlap]

On Wed, 3 Dec 2003 17:34:08 -0800 Mike Fedyk <mfedyk@xxxxxxxxxxxxx> wrote:

| On Thu, Dec 04, 2003 at 02:01:47AM +0100, Vince wrote:
| > Zwane Mwaikambo wrote:
| > >On Wed, 3 Dec 2003, Vince wrote:
| > >
| > >
| > >>Well, I get indeed a nice oops on screen with this sysctl... but the
| > >>oops/panic does not appear on the floppy dump  :-/
| > >>
| > >>--------------------------------------------------------
| > >><0>Kernel panic: Fatal exception
| > >><4> <0>Dumping messages in 100 seconds : last chance for
| > >>Alt-SysRq...<6>SysRq :
| > >>Emergency Sync
| > >><6>SysRq : Emergency Sync
| > >><6>SysRq : Emergency Remount R/O
| > >><6>SysRq : Trying to dump through real mode
| > >><4>
| > >>---------------------------------------------------------
| > >
| > >
| > >Do you see any floppy disk activity at all? I'll see if i can come up with
| > >something.
| > 
| > Yes, there *is* floppy activity. The previous messages make it to the 
| > floppy (in that case, I experienced with 
| > Alt-Sysrq+S/Alt-Sysrq+U/Alt-Sysrq+D), but the oops doesn't...

It seems possible that these commands (above) are flushing the kernel
log buffer to disk (/var/log/messages e.g.), so that they don't need
to be saved by kmsgdump.  Have you looked in the kernel message file
for them?

| do you mean s/Alt-Sysrq+D/Alt-Sysrq+B/  ?
| 
| On 2.4 there isn't a Alt-Sysrq+D, but maybe there is on 2.6...?

The kmsgdump patch adds Alt-SysRq-D to force entry into kmsgdump
instead of getting there via a panic.

--
~Randy
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