>Number:         13451
>Category:       kern
>Synopsis:       "panic: lockmgr: using decommissioned lock" unmounting vnd
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jul 12 15:29:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Andreas Gustafsson
>Release:        CVS 1.5 release branch as of June 28, 2001
>Organization:
Nominum, Inc.
>Environment:
System: NetBSD cuba.nominum.com 1.5.1 NetBSD 1.5.1 (CUBA) #1: Fri Jun 29 11:01:44 PDT 2001 gson@cuba.nominum.com:/usr/src/sys/arch/i386/compile/CUBA i386

Architecture: i386
Machine: i386
>Description:

During an attempt to build an i386 boot floppy, installboot hung after
printing the message "unmounting".  I sent the installboot process a
SIGKILL and then attempted to forcibly unmount the vnd device
using "umount -f /dev/vnd0".  The machine paniced:

panic: lockmgr: using decommissioned lock
#0  0x100 in ?? ()
(gdb) where
#0  0x100 in ?? ()
#1  0xc02c9607 in cpu_reboot ()
#2  0xc01b8079 in panic ()
#3  0xc01a9d3d in lockmgr ()
#4  0xc01d358e in dounmount ()
#5  0xc01d351f in sys_unmount ()
#6  0xc02d1548 in syscall ()
#7  0xc0100fc9 in syscall1 ()

>How-To-Repeat:

Not attempted; this is a production system.

>Fix:

Not known.
>Release-Note:
>Audit-Trail:
>Unformatted: