BUG: crashkernel does not boot upon crash from sysrq-trigger

[Christoph Paasch]

Hello,

since 3.5, my crashkernel does not boot anymore when triggering an oops with
/proc/sysrq-trigger on my HP Elitebook 8540p.

I bisected it down to 722bc6b16771ed8 (x86/mm: Fix the size calculation of
mapping tables).


Does anybody has an idea what is going wrong here?
Let me know, if I should provide more information.


Thanks,
Christoph

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