repeatable kernel freeze

Joe Conway mail at
Thu Jun 17 01:24:05 UTC 2010

On 06/16/2010 05:39 PM, Sam Varshavchik wrote:
> Based on the assumption that you are experiencing a kernel crash, there
> are two ways of obtaining diagnostics:
> 1) A serial console. Going retro, getting a null-modem adapter, and
> connecting the serial port of the ailing machine with the serial port on
> another machine, adding the "console" parameter to the kernel boot
> prompt, and redirecting console messages through the serial port to
> another machine where you'll run minicom to capture the incoming serial
> port data. Hopefully, if your kernel is oopsing or crashing, you will be
> able to obtain a log a useful dump.

I actually tried this a while back, but this machine has no serial port,
and USB-to-rs232 did not seem to work.

> 2) Using kexec-tools to set up a recovery kernel. Adding the crashkernel
> parameter to your kernel boot prompt, reserving 128MB of your RAM for a
> recovery kernel and a small boot image. When your running kernel
> crashes, the recovery kernel, installed by kexec-tools, is going to
> generate a kernel dump, which can then be grokked by crash to generate a
> dump.
> In either case, you have a fair bit of RTFMing to do.
> And then after wasting all the time, you'll discover that you're not
> getting a useful crash in the first place.

Hmmm, you paint a rosy picture ;-)

But if I do nothing, my choices are:
1) hope to get lucky on some future kernel update
2) buy new hardware
3) live with not using scp or rsync over ssh

Maybe it's time for a hardware upgrade....


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