Re: [perf] unchecked MSR access error: WRMSR to 0x689 in intel_pmu_lbr_restore

[Vince Weaver]

On Tue, 12 Jul 2022, Pawan Gupta wrote:

> On Tue, Jul 12, 2022 at 03:39:56PM -0400, Vince Weaver wrote:
> It appears this CPU does not support TSX feature (or disabling TSX). If
> the bug is easy to reproduce, bisecting can help.

I thought TSX was disabled via firmware update for all Haswell machines?

In any case, the fuzzer is triggering the
	unchecked MSR access error: WRMSR to 0x689
in intel_pmu_lbr_restore.  So either this is a false error and should be 
disabled, or else it's a real issue and should be fixed.

Unfortunately the fuzzer can take up to a few days to trigger the message 
(it's not easily repeatable) so doing a kernel bisect would take a very 
long time.

Vince