Re: [perf] crashing bug in icl_update_topdown_event

[Vince Weaver]

On Wed, 11 Jun 2025, Vince Weaver wrote:

> Oops: general protection fault, maybe for address 0xffff89aeceab400: 0000
> CPU: 23 UID: 0 PID: 0 Comm: swapper/23
> Tainted: [W]=WARN
> Hardware name: Dell Inc. Precision 9660/0VJ762
> RIP: 0010:native_read_pmc+0x7/0x40
> Code: cc e8 8d a9 01 00 48 89 03 5b cd cc cc cc cc 0f 1f ...
> RSP: 000:fffb03100273de8 EFLAGS: 00010046

one additional note that's probably relevant, this is on a hybrid CPU 
machine, so CPUs 16-23 are atom cores that don't support topdown.

So the crash is probably because for whatever reason the kernel is trying 
to read topdown events on an unsupported core and triggering a GPF.

Vince