Date: Wed, 23 Apr 2003 12:55:45 -0400 From: "Craig Reyenga" <creyenga@connectmail.carleton.ca> To: <freebsd-gnats-submit@FreeBSD.org> Subject: kern/51318: Renice idle process not illegal; causes hang Message-ID: <000f01c309b9$350d2700$0200000a@fireball> Resent-Message-ID: <200304231700.h3NH0Hjl088858@freefall.freebsd.org>
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>Number: 51318
>Category: kern
>Synopsis: Renice idle process not illegal; causes hang
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Apr 23 10:00:16 PDT 2003
>Closed-Date:
>Last-Modified:
>Originator: Craig M. R.
>Release: FreeBSD 5.0-CURRENT i386
>Organization:
My Room
>Environment:
System: FreeBSD cesspool 5.0-CURRENT FreeBSD 5.0-CURRENT #1: Sat Apr 12
18:47:02 EDT 2003
craig@cesspool:/usr/obj/usr/src/sys/CKERN i386
<machine, os, target, libraries (multiple lines)>
>Description:
I tried 'renice -n -20 10' (pid 10 is idle thread) to see what would
happen. Turns out that this operation isn't illegal, the system hung
accordingly, and the console started displaying this message:
swap_pager: indefinite wait buffer: device: ad0s1b, blkno: 776,
size: 4096
over and over, although not rapidly.
Using SCHED_ULE 1.27
>How-To-Repeat:
'renice -n -20 10'
>Fix:
setpriority() should return [EINVAL] for pid 10, or the process
should have some flag set to disallow reniceing the idle process.
>Release-Note:
>Audit-Trail:
>Unformatted:
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From: creyenga@connectmail.carleton.ca <craig>
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