Re: kern/59175: posix_spawn hang, hanging other process too

["Michael van Elst via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR kern/59175; it has been noted by GNATS.

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/59175: posix_spawn hang, hanging other process too
Date: Fri, 14 Mar 2025 11:07:28 -0000 (UTC)

 gnats-admin%NetBSD.org@localhost ("Thomas Klausner via gnats") writes:
 
 > On Fri, Mar 14, 2025 at 01:23:53AM +0000, Taylor R Campbell wrote:
 > > The attached program appears to reproduce the issue.
 > > 
 > > make waitrace
 > > ./waitraice &
 > > while :; do kill -INFO %1; sleep 1; done
 > > 
 > > At some point, it will stop printing numbers because it is stuck.
 > 
 > Just to confirm, I ran this test just now and saw numbers go up to for
 > a couple minutes then it stopped.
 
 
 The test ran for several hours on a Sandy Bridge (-current) and
 Haswell (netbsd-10) system without locking up.
 
 On a Zen1 Ryzen (-current) it stopped after about 20 minutes. Apparently
 sysctl_kern_proc_args tries to page in something and loops infinitely.