On Mon, Aug 03, 2015 at 11:32:28PM +0200, Jiri Olsa wrote: > hi, > I'm getting following message on the kdump kernel start > > Broken BIOS detected, complain to your hardware vendor.\ > [Firmware Bug]: the BIOS has corrupted hw-PMU resources (MSR 38d is b0) > > it seems to be caused by NMI watchdog being configured > and fixed counter values stays in MSRs, which triggers > warning in check_hw_exists and disables perf support > in kdump kernel.. which probably does not hurt ;-) > > zeroing MSRs during kdump shutdown seems to work (attached) > but I'm not sure thats correct place for kdump perf callback Right, but why bother? All that kernel needs to do is write a memory dump to someplace and reboot, right? The less you do, the less can go wrong.
