netbsd-bugs: kern/32985: unmounting a filesystem (umount or shutdown) causes panic

Subject: kern/32985: unmounting a filesystem (umount or shutdown) causes panic
To: None <kern-bug-people@netbsd.org, gnats-admin@netbsd.org,>
From: None <itohy@netbsd.org>
List: netbsd-bugs
Date: 03/04/2006 06:20:00

>Number:         32985
>Category:       kern
>Synopsis:       unmounting a filesystem (umount or shutdown) causes panic
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 04 06:20:00 +0000 2006
>Originator:     ITOH Yasufumi
>Release:        NetBSD 3.99.16 (source of March 3, 2006)
>Organization:
>Environment:
System: NetBSD mei.my.domain 3.99.16 NetBSD 3.99.16 (MEI) #128: Sat Mar  4 00:16:53 JST 2006 itohy@pino.my.domain:/w/src/sys/arch/i386/compile/MEI i386
Architecture: i386
Machine: i386
a.out kernel and userland
userland is 1.6L

>Description:
	Unmounting a filesystem causes panic.
	This causes on using umount(8) command and on shutting down
	the system.
	Kernels from 1.6, 2 and 3 branches don't have the problem.

	# mount -r /usr
	# umount /usr
	uvm_fault(0xc3ba8d20, 0x81e58000, 0, 1) -> 0xe
	kernel: supervisor trap page fault, code=0
	db> t
	uvm_fault(0xc3ba8d20, 0x81e58000, 0, 1) -> 0xe
	kernel: supervisor trap page fault, code=0
	Faulted in DDB; continuing...
	db>

>How-To-Repeat:
	Unmount a filesystem.

>Fix:
	Unknown