Re: Regression on linux-next (next-20260324 )

[Peter Zijlstra]

On Mon, Apr 20, 2026 at 11:45:12PM -0700, John Stultz wrote:

> So I tripped over this in my own testing today preping proxy patches,
> bisecting it down to the same problematic commit 25500ba7e77c
> ("locking/mutex: Remove the list_head from struct mutex").
> 
> Inteed it does seem related to ww_mutexes, as I can pretty easily
> reproduce it with defconfig + CONFIG_WW_MUTEX_SELFTEST=y  using
> qemu-system-x86
> 
> Where the test will basically hang on bootup.

*groan* indeed. This of course means no CI is running this thing :-(

Anyway, yay for deterministic reproducer. Let me go prod at this.