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

[Sebastian Andrzej Siewior]

On 2026-02-26 14:24:34 [+0100], Bert Karwatzki wrote:
> I think I've found the reason for the stall. I was looking at commit 9311e6c29b34
> ("cgroup: Fix sleeping from invalid context warning on PREEMPT_RT"),
> and noticed this:
…
I did say that removing LAZY "fixes" it in
	https://lore.kernel.org/all/20260225154341.32AjXoVi@xxxxxxxxxxxxx/

I wouldn't describe this as a reason.
The delay leads to different behaviour and I am not sure if systemd
behaves wrongly or if there is a missing wake up.
Tejun did explain in
	https://lore.kernel.org/all/aQzg9kcnCsdRQiB4@xxxxxxxxxxxxxxx/

that a slight delay is okay. Something is odd here.

> and this seems to have fixes the issue for me. (Five successful reboots
> in a row, needs more testing).

> Bert Karwatzki

Sebastian