kern/40750: hackbench screws up 5.0 kernel

[ad%netbsd.org@localhost]

>Number:         40750
>Category:       kern
>Synopsis:       hackbench screws up 5.0 kernel
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Feb 24 23:15:00 +0000 2009
>Originator:     Andrew Doran
>Release:        5.0_RC2
>Organization:
The NetBSD Project
>Environment:
i386 smp
very high maxprocs, maxfiles
4GB RAM, 4GB swap
>Description:
As per summary.
>How-To-Repeat:
This did not happen 6 months ago.
Run the new threaded hackbench three times:

- threaded mode, with pipes
- process mode, with pipes
- process mode, with sockets.

Boom, the hackbench processes hang waiting for KVA space to become available.


http://www.netbsd.org/~ad/vm_map/hackbench.c
http://www.netbsd.org/~ad/vm_map/backtrace.txt
http://www.netbsd.org/~ad/vm_map/kernel_map.txt
http://www.netbsd.org/~ad/vm_map/kmem_map.txt
http://www.netbsd.org/~ad/vm_map/ps-axlsww.txt
http://www.netbsd.org/~ad/vm_map/show-map.txt
http://www.netbsd.org/~ad/vm_map/vmstat-C.txt
http://www.netbsd.org/~ad/vm_map/vmstat-e.txt
http://www.netbsd.org/~ad/vm_map/vmstat-m.txt
http://www.netbsd.org/~ad/vm_map/vmstat-s.txt

>Fix:
Not yet debugged.