Re: ~90s reboot delay with v6.19 and PREEMPT_RT

[Sebastian Andrzej Siewior]

On 2026-02-19 17:46:47 [+0100], Bert Karwatzki wrote:
> Since linux v6.19 I noticed that rebooting my MSI Alpha 15 Laptop
> would hang for about ~90s before rebooting. I bisected this (from
> v6.18 to v6.19) and got this as the first bad commit:
> 9311e6c29b34 ("cgroup: Fix sleeping from invalid context warning on PREEMPT_RT")
…

I'm on it. I looks like we free the task after sched_process_wait() but
before it is entirely gone there is a wait() on its pid. Some of them do
come back but one seems to be stuck and I need to figure out which one.
If we get rid of the LAZY then it happens "quick" enough so it works.

> Bert Karwatzki

Sebastian