On Thu, Feb 04, 2021 at 12:35:42AM +0300, Pavel Tikhomirov wrote: > > AFAICS if pid is held only by 1) fowner refcount and by 2) single process > (without threads, group and session for simplicity), on process exit we go > through: > > do_exit > exit_notify > release_task > __exit_signal > __unhash_process > detach_pid > __change_pid > free_pid > idr_remove > > So pid is removed from idr, and after that alloc_pid can reuse pid numbers > even if old pid structure is still alive and is still held by fowner. ... > Hope this answers your question, Thanks! Yeah, indeed, thanks! So the change is sane still I'm a bit worried about backward compatibility, gimme some time I'll try to refresh my memory first, in a couple of days or weekend (though here are a number of experienced developers CC'ed maybe they reply even faster).
