Re: kern/56414: cmake hang on kqueue (condvar waiter list issue) ?

[Joerg Sonnenberger <joerg%bec.de@localhost>]

The following reply was made to PR kern/56414; it has been noted by GNATS.

From: Joerg Sonnenberger <joerg%bec.de@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/56414: cmake hang on kqueue (condvar waiter list issue) ?
Date: Wed, 22 Sep 2021 01:31:52 +0200

 On Tue, Sep 21, 2021 at 03:00:00PM +0000, Manuel.Bouyer%lip6.fr@localhost wrote:
 > >Number:         56414
 > >Category:       kern
 > >Synopsis:       cmake hang on kqueue
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       high
 > >Responsible:    kern-bug-people
 > >State:          open
 > >Class:          sw-bug
 > >Submitter-Id:   net
 > >Arrival-Date:   Tue Sep 21 15:00:00 +0000 2021
 > >Originator:     Manuel Bouyer
 > >Release:        NetBSD 9.99.77
 > >Organization:
 > >Environment:
 > System: NetBSD amd64-nb9.netbsd.org 9.99.77 NetBSD 9.99.77 (amd64-nb9-PVH) #3: Sun Jan 10 08:56:13 UTC 2021  spz%franklin.NetBSD.org@localhost:/home/netbsd/current/amd64/obj/sys/arch/amd64/compile/amd64-nb9-PVH amd64
 > Architecture: x86_64
 > Machine: amd64
 > >Description:
 > 	In a full pbulk build, I see cmake process hanging on kqueue,
 > 	stalling the build. usually, a kill -STOP/kill -CONT on the
 > 	cmake process wakes it up, and the package build completes without
 > 	issue. This will occur several times in a pbulk run.
 > 	This has been discussed several times on NetBSD's lists,
 > 	as in
 > 	http://mail-index.netbsd.org/tech-kern/2021/01/12/msg027056.html
 > 	https://mail-index.netbsd.org/current-users/2021/04/06/msg040695.html
 
 This is not a kernel issue, but a corruption of the wait list in
 userland.
 
 Joerg