kexec was borked in 5.0+ kernel I was using. Switched to 5.0.3 stable and kexec works as expected. No warnings seen with a kexec boot.
-----Original Message----- From: DSouza, Nelson Sent: Thursday, March 21, 2019 4:16 PM To: Peter Zijlstra <[email protected]> Cc: Tony Jones <[email protected]>; Thomas Gleixner <[email protected]>; Stephane Eranian <[email protected]>; Ingo Molnar <[email protected]>; Jiri Olsa <[email protected]>; LKML <[email protected]> Subject: RE: [PATCH 1/8] perf/x86/intel: Fix memory corruption Attached cpu hotplug test output while perf is running in the background. No WARN messages seen. When I run the kexec command, it boots to bios. Haven't used kexec before. Still trying to figure that one out. -----Original Message----- From: Peter Zijlstra [mailto:[email protected]] Sent: Thursday, March 21, 2019 1:07 PM To: DSouza, Nelson <[email protected]> Cc: Tony Jones <[email protected]>; Thomas Gleixner <[email protected]>; Stephane Eranian <[email protected]>; Ingo Molnar <[email protected]>; Jiri Olsa <[email protected]>; LKML <[email protected]> Subject: Re: [PATCH 1/8] perf/x86/intel: Fix memory corruption On Thu, Mar 21, 2019 at 07:47:50PM +0000, DSouza, Nelson wrote: > Is the request to check whether the msr gets reset to default upon reboot of > the machine ? basically: - apply patch - start workload with 4 counter (on all CPUs), such that tfa-msr=1 - try the following: o cpu hotplug o kexec to see if the new WARN will trigger -- it should not.
