>Number:         7485
>Category:       kern
>Synopsis:       can't set an autoniced process' priority back to 0
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people (Kernel Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 27 17:35:01 1999
>Last-Modified:
>Originator:     Thilo Manske
>Organization:
>Release:        1.3.3
>Environment:
	
System: NetBSD Server 1.3.3 NetBSD 1.3.3 (HEHOL) #22: Fri Mar 19 04:11:34 MET 1999 thilo@Server:/usr/src/sys/arch/i386/compile/HEHOL i386
+ 1.3scheduler patch + various kernel-security patches
(19990120-accept, 19990311-umapfs, 19990317-mount)

>Description:
Ok, this is really weird (for me):

I have a process running wich has been autoniced to 4.
I tried to set its nice-value back to 0:

I can set it to any nice value !=0; if I try to
set it to 0 the process get's niced to priority 4.

Server:/ #renice 3 27425 
27425: old priority 4, new priority 3
Server:/ #renice 2 27425 
27425: old priority 3, new priority 2
Server:/ #renice 1 27425 
27425: old priority 2, new priority 1
Server:/ #renice 0 27425 
                 ^
27425: old priority 1, new priority 0
                                    ^
Server:/ #renice -1 27425 
27425: old priority 4, new priority -1
                    ^!!
Server:/ #renice -2 27425 
27425: old priority -1, new priority -2
Server:/ #renice -3 27425 
27425: old priority -2, new priority -3

(I hope you got the picture...)

If this is not a bug I would like somebody to
explain me the purpose of this "feature" :-)

>How-To-Repeat:
try "renice 0 <pid>" on an autoniced process
>Fix:
>Audit-Trail:
>Unformatted: