Re: Stalls when starting a VSOCK listening socket: soft lockups, RCU stalls, timeout

Matthieu Baerts
2026-03-08T17:23:16Z

08 Mar 2026 17:58:26 Thomas Gleixner <tglx@kernel.org>:

> On Sun, Mar 08 2026 at 10:15, Thomas Gleixner wrote:
>
>> On Sat, Mar 07 2026 at 23:29, Thomas Gleixner wrote:
>>> I'll look at it more tomorrow in the hope that this rested brain
>>> approach works out again.
>>
>> There is another one of the same category. Combo patch below.
>
> This rested brain thing is clearly a myth. The patch actually solves
> nothing because the code ensures that the TRANSIT bit is never set
> together with the ONCPU bit.

Thank you for having shared these patches. I confirm the myth: I can
still reproduce the issue on my side.

> One of those moments where you just hope that the earth opens up and
> swallows you.
>
> So I'm back to square one. I go and do what I should have done in the
> first place. Write a debug patch with trace_printks and let the people
> who can actually trigger the problem run with it.

Happy to test such debug patches!

Cheers,
Matt