Re: bin/50350: rump/rumpkern/t_sp/stress_{long,short} fail on Core 2 Quad

[Andrew Doran <ad%netbsd.org@localhost>]

The following reply was made to PR bin/50350; it has been noted by GNATS.

From: Andrew Doran <ad%netbsd.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: Andreas Gustafsson <gson%gson.org@localhost>, joerg%netbsd.org@localhost, martin%netbsd.org@localhost
Subject: Re: bin/50350: rump/rumpkern/t_sp/stress_{long,short} fail on Core 2
 Quad
Date: Sat, 25 Jan 2020 13:39:56 +0000

 On Sat, Jan 25, 2020 at 08:10:01AM +0000, Andreas Gustafsson wrote:
 
 >  The rump/rumpkern/t_sp/stress_{long,short} are once again failing on
 >  my bare metal amd64 testbed (currently a dual Intel Xeon L5630).
 >  The problem reappeared with these commits:
 >  
 >    commit 2020.01.12.22.03.22 ad src/sys/kern/kern_exec.c 1.488
 >    commit 2020.01.12.22.03.22 ad src/sys/kern/kern_runq.c 1.58
 >    commit 2020.01.12.22.03.23 ad src/sys/sys/lwp.h 1.196
 >    commit 2020.01.12.22.03.23 ad src/sys/sys/sched.h 1.87
 
 The distribution of new LWPs has changed, and it's exposing very old bugs in
 libpthread and/or rump.  We have identified and fixed some but it looks like
 there are still more.  I first ran into this with libmicro back in November
 and Joerg has been seeing it on pbulk runs.  I'll dig in further when I get
 a chance.
 
 Andrew