Re: PANIC: "Oops: 0000 [#1] PREEMPT SMP PTI" starting from 5.17 on dual socket Intel Xeon Gold servers

On Tue, Mar 22, 2022 at 12:37:37AM +0100, Jirka Hladky wrote:

Cc: regressions@lists.linux.dev stable@vger.kernel.org

On Tue, Mar 22, 2022 at 12:29 AM Jirka Hladky jhladky@redhat.com wrote:

...

Starting from kernel 5.17 (tested with rc2, rc4, rc7, rc8) we experience kernel oops on Intel Xeon Gold dual-socket servers (2x Xeon Gold 6126 CPU)

Bellow is a backtrace and the dmesg log.

I have trouble creating a simple reproducer - it happens at random places when preparing the NAS benchmark to be run. The script creates a bunch of directories, compiles the benchmark a start trial runs.

Could you please help to narrow down the problem?

Can you use 'git bisect' to track down the kernel commit that caused this problem?

thanks,

greg k-h