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

[Manuel Bouyer <manuel.bouyer%lip6.fr@localhost>]

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

From: Manuel Bouyer <manuel.bouyer%lip6.fr@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/56414: cmake hang on kqueue (condvar waiter list issue) ?
Date: Wed, 22 Sep 2021 06:33:09 +0200

 On Tue, Sep 21, 2021 at 11:40:01PM +0000, Joerg Sonnenberger wrote:
 >  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.
 
 Ha, interesting. The userland is 9.0_STABLE/amd64 from
 Jun 11 22:49:34 UTC 2020. Any idea if a fix is available in netbsd-9 ?
 
 -- 
 Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer%lip6.fr@localhost
      NetBSD: 26 ans d'experience feront toujours la difference
 --