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Date: Wed, 2 May 2001 16:43:26 -0700 (PDT)
From: Archie Cobbs <archie@packetdesign.com>
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To: FreeBSD-gnats-submit@freebsd.org
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Subject: kern/27044: remounting a r/w filesystem read-only causes shutdown problem
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>Number:         27044
>Category:       kern
>Synopsis:       remounting a r/w filesystem read-only causes shutdown problem
>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 May 02 16:50:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Archie Cobbs
>Release:        FreeBSD 4.3-RELEASE i386
>Organization:
Packet Design
>Environment:
System: FreeBSD bubba.packetdesign.com 4.3-RELEASE FreeBSD 4.3-RELEASE #0: Thu Apr 26 15:28:39 PDT 2001 root@bubba.packetdesign.com:/usr/obj/usr/src/sys/BUBBA i386


>Description:

	Sometimes FreeBSD has problems "syncing buffers" when shutting
	down, and then it "gives up". I'm not sure why this happens, but
	the practical result is an unclean (and possibly screwed up)
	filesystem at the next reboot, so it's definitely a bad thing.

	I can reproducibly get this to happen by mounting a filesystem
	read-write, mucking with some files, and then remounting
	it read-only (ie., updating the mount: "mount -u -o ro"), and
	then rebooting.

>How-To-Repeat:

	mount /foo
	cp -R /var /foo
	mount -u -o ro /foo
	reboot

	By the way, /foo has soft updates enabled.

>Fix:

	Skip the "mount -u -o ro /foo" step.

>Release-Note:
>Audit-Trail:
>Unformatted:

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