[Bug] Kdump does not work when panic triggered due to MCE

Huang Ying ying.huang at intel.com
Mon May 9 21:28:00 EDT 2011

Hi, Prasad,

On 05/10/2011 12:35 AM, K.Prasad wrote:
> On Fri, May 06, 2011 at 07:38:25PM +0200, Andi Kleen wrote:
>>> Has anybody tested this before? Or have found kdump working when fatal
>>> MCEs have actually occurred?
>> Ying did some testing. mce-test has test cases for kdump.
> We'd be glad to hear about any successful testcases with recent kernels.
> My manual testing was quite similar to what the LTP kdump testcase would
> do i.e. configure kdump service, trigger crash through
> /proc/sysrq-trigger and watchout for kdump....but as you could see in
> the logs, that did not happen.
>> My guess is you injected the error into some area used by the kexec
>> code or boot up path of the kexec kernel.
>> -Andi
> The logs did not suggest that the second kernel was booted into. The
> "Rebooting in ... seconds" message appeared from the first kernel. I
> tried the kdump testcase in atleast two dissimilar machines but with
> the same results, so it is not clear if the kexec code was affected by
> the MCE injection in both the cases.

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