From: Borislav Petkov <bp@alien8.de>
> What system is this? Full dmesg and .config pls.
> 
> How exactly are you launching the kexec kernel, etc, etc?

dmesg, kernel config and a script to load kexec is attached.

I could reproduce the problem as followings:

  # ./kexec-p-noinitrd.sh
  # cat /sys/kernel/kexec_crash_loaded
  1
  # echo c > /proc/sysrq-trigger

If the problem reproduces, the system stops or resets just after
showing a call trace of sysrq-panic on console.
On kernels without problem, it should show boot messages from
the 2nd kernel after the sysrq-panic call trace.

When I use "--noefi" option of kexec, the problem didn't occur.
So I think you need EFI-based system to reproduce the problem.

-- 
Jun'ichi Nomura, NEC Corporation / NEC Solution Innovators, Ltd.