[PATCH] keys: use long workqueue for garbage collection

[Jarkko Sakkinen]

On Sat, Oct 24, 2026 at 08:20:55AM +0300, Jarkko Sakkinen wrote:
> On Sat, Oct 24, 2026 at 06:29:44AM +0200, Eduard Zateev wrote:
> > The key garbage collector can wait for RCU grace periods. This can occupy a
> > normal events worker for a long time and contribute to workqueue lockups.
> > 
> > Queue key GC on system_long_wq because its work may wait for long periods.
> > 
> > Reported-by: syzbot+c15de43f1e7fffbb7b9b at syzkaller.appspotmail.com
> > Link: https://syzkaller.appspot.com/bug?extid=c15de43f1e7fffbb7b9b
> > Signed-off-by: Eduard Zateev <hackerowskiy at gmail.com>
> 
> This commit message is not huge selling point for any possible argument.

You ignored key_gc_timed_out(), which leaves code to a broken state and
switching workqueue is not solving any possible root cause of anything.
The long queue exists mostly for the sake of flush_workqueue().

Please stop sending patches like this in the future.

Br, Jarkko