FYI: another colleague confirmed the above finding:
"
I looked into it and I can confirm the finding.
Tested on Ubuntu 1410
Linux ubuntu 3.16.0-9-generic #14-Ubuntu SMP Fri Aug 15 15:03:57 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux
VMname: ubuntu1410
With the default crashkernel=128M@64M when we trigger the crash a kernel
panic gets generated but no vmcore/crash file is generated under
/var/crash and the VM will hang and not reboot.
However if we modify the kernel parameter as suggested to
crashkernel=384M-:256M and trigger a kernel panic, the vm will reboot,
and also generate a vmcore/crash file under /var/crash.
Tested on 2 different VM settings: 2GB / 2VCPU and 5GB/4VCPUs.
"
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https://bugs.launchpad.net/bugs/1359980
Title:
[Hyper-V] Unable to perform a full kernel crash on Ubuntu 14.10
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