Re: PID namespace init releases its file locks before its children die

[Christian Brauner]

On Fri, Oct 03, 2025 at 02:38:28PM +0200, Oleg Nesterov wrote:
> Add CCs.
> 
> I can't really help, just my 2 cents...
> 
> I don't think we can change do_exit() to call exit_files() after
> exit_notify().
> 
> At first glance, technically it is possible to change do_exit() so
> that the exiting reaper does zap_pid_ns_processes() earlier... But
> even if this is possible, I think that this complication needs more
> justification.

I agree. Relying on side-effect of file locks being released isn't exactly
a great idea. I'm certainly don't want to give any guarantee there. It's
doable with cgroups which is the correct solution for this imho.