kern/119423: Kernel panic (page fault) with devfs rules
Jille Timmermans
jille at quis.cx
Mon Jan 7 07:50:04 PST 2008
>Number: 119423
>Category: kern
>Synopsis: Kernel panic (page fault) with devfs rules
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Jan 07 15:50:01 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator: Jille Timmermans
>Release: FreeBSD 6.3-PRERELEASE i386 / FreeBSD 6.2-RELEASE-p4 i386
>Organization:
None
>Environment:
FreeBSD 6.3-PRERELEASE i386 / FreeBSD 6.2-RELEASE-p4 i386
System: FreeBSD blackbox.quis.cx 6.3-PRERELEASE FreeBSD 6.3-PRERELEASE #1: Sun Jan 6 23:24:15 CET 2008 root at blackbox.quis.cx:/usr/obj/usr/src/sys/BLACKBOX i386 and FreeBSD istud.quis.cx 6.2-RELEASE-p4 FreeBSD 6.2-RELEASE #0: Sat May 12 16:41:58 CEST 2007 root at istud.quis.cx:/usr/obj/usr/src/sys/ISTUD i386
>Description:
A kernel panic (page fault) occurs when trying to add rules to a devfs mount.
I can give you kernel dumps and backtraces if needed.
>How-To-Repeat:
mkdir dev
mount -t devfs devfs dev
devfs -m dev ruleset 50
devfs -m dev rule add type disk hide
devfs -m dev rule applyset
>Fix:
In /usr/src/sys/fs/devfs/devfs_rule.c:546
if (dev == NULL ||
Changed into:
if (dev == NULL || dev->si_devsw == NULL ||
>Release-Note:
>Audit-Trail:
>Unformatted:
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