Re: 6.8 to 6.9.0-rc3: kernel NULL pointer dereference in pick_next_task_fair+0x89

From: Peter Zijlstra
Date: Mon Apr 15 2024 - 06:59:20 EST


On Sun, Apr 14, 2024 at 09:50:18AM +0100, Sergei Trofimovich wrote:
> Hi kernel/sched/ maintainers!
>
> Over past few days my machines started OOpsing when a nightly kernel
> build starts. I don't have a reliable reproducer. The builder should use
> `idle` CPU scheduling policy.
>

Thanks for the report, some of us have been chasing this ghost for a
little while and so far it has proven elusive because it's very hard to
reliably reproduce.

I'll go try with your approach.