kern/40730: any user can crash the system with KERN_SA

[ad%netbsd.org@localhost]

>Number:         40730
>Category:       kern
>Synopsis:       any user can crash the system with KERN_SA
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Feb 23 22:45:00 +0000 2009
>Originator:     Andrew Doran
>Release:        5.0_RC2
>Organization:
The NetBSD Project
>Environment:
i386, SMP system
>Description:
As per summary.
>How-To-Repeat:
http://www.gelato.unsw.edu.au/patches/pthreadbench/pthreadbench.tar.gz

export PTHREAD_CONCURRENCY=8
while true; do
 ./contested &
 ./wakeup &
 ./... &
 ...
done

I recall MySQL sysbench and other stress tests also causing crashes.

>Fix:
Disable SA compat in shipped kernels for release of 5.0.