Subject: Re: deadlocks on pernet_ops_rwsem

From: Jakub Kicinski <[email-masked]>
Date: Wed, 1 Oct 2025 13:30:37 -0700

On Wed, 1 Oct 2025 15:33:56 -0400 Willem de Bruijn wrote:
> > > Was there any update on packages (especially qemu?) used by
> > > CI around 2025-09-18 ?  
> >
> > No updates according to the logs. First hit was on Thursday so I thought
> > maybe it came from Linus. But looking at the branches we fast forwarded
> > 2025-09-18--21-00 and there were 2 hits earlier that day (2025-09-18--03-00,
> > 2025-09-18--15-00)  
> 
> Is there a good SHA1 around the time of the earliest report?
> 
> There do not seem to be any recent changes to rwsem, let alone
> specifically to pernet_ops_rwsem.

The first time it triggered when net-next was at 152ba35c04ad
and net at 09847108971a, CI branch contents:
https://netdev.bots.linux.dev/static/nipa/branch_deltas/net-next-2025-09-18--03-00.html

The previous one (so the branch before the first time it triggered)
had base commits of 6b957c0a36f5 09847108971a.

If you click on the link above you can go back / forward in the branch
contents.