Re: linux-next crashes in scheduler on s390

[Sven Schnelle]

Alexander Gordeev <agordeev@xxxxxxxxxxxxx> writes:

> Hi All,
>
> Since about June 1st we're getting strace test suite (make -j$(nproc) check)
> crashes on s390 in linux-next. Those are pretty easy to reproduce, but I
> have not been able to nail it down to the particular commit/merge.
>
> I am going to bisect it, but since we are approaching v7.1 release, any
> hint would be greatly appreciated!
> [..]

I bisected it to
https://lore.kernel.org/all/20260511120627.944705718@xxxxxxxxxxxxx/
("[PATCH v2 08/10] sched/fair: Add newidle balance to pick_task_fair()")

Adding the patch proposed in
https://lore.kernel.org/all/20260603095108.GA1684319@xxxxxxxxxxxxx/
fixes the issue for me.

To reproduce, running the strace test suite seems enough. If required, I
can try to figure out the exact test that crashes the kernel.