This is a known problem in older versions of kexec-tools. A patch was committed to upstream which seems to address this problem (commit 0d526445f3d3f26f50e674d75ceee344c31369f1 - "x86, kaslr: add alternative way to locate kernel text mapping area"). Your testing of v2.0.7 does not show this works still. This will require more investigation in that case. Any way, I will be releasing v2.0.7 of kexec-tools shortly (before the end of this week). Please test again with the updated package just for grins.
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