Date: Sun, 13 Apr 1997 23:13:14 +0400 (MSD) From: Dmitrij Tejblum <dima@tejblum.dnttm.rssi.ru> To: FreeBSD-gnats-submit@freebsd.org Subject: kern/3276: unmount DEVFS ==> panic: unmount: dangling vnode Message-ID: <199704131913.XAA00844@tejblum.dnttm.rssi.ru> Resent-Message-ID: <199704131920.MAA19796@freefall.freebsd.org>
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>Number: 3276
>Category: kern
>Synopsis: unmount DEVFS ==> panic: unmount: dangling vnode
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Apr 13 12:20:03 PDT 1997
>Last-Modified:
>Originator: Dmitrij Tejblum
>Organization:
>Release: FreeBSD 3.0-CURRENT i386
>Environment:
FreeBSD tejblum.dnttm.rssi.ru 3.0-CURRENT FreeBSD 3.0-CURRENT #0: Sat Apr 12 19:
43:17 MSD 1997 dima@tejblum.dnttm.rssi.ru:/usr/src/sys/compile/DIMA i386
devfs /devs devfs rw 0 0
in /etc/fstab
>Description:
When system unmount /devs, in particular on shutdown, system panic:
unmount: dangling vnode.
>How-To-Repeat:
put the line above in /etc/fstab
mount /devs
umount /devs
>Fix:
Workaround (?):
*** sys/miscfs/devfs/devfs_vfsops.c.orig Sat Apr 12 18:02:55 1997
--- sys/miscfs/devfs/devfs_vfsops.c Sun Apr 13 23:10:34 1997
***************
*** 139,151 ****
/*
* Unmount the filesystem described by mp.
- * Note: vnodes from this FS may hang around if being used..
- * This should not be a problem, they should be self contained.
*/
static int
devfs_unmount( struct mount *mp, int mntflags, struct proc *p)
{
struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
DBPRINT(("unmount "));
devfs_free_plane(devfs_mp_p);
--- 139,158 ----
/*
* Unmount the filesystem described by mp.
*/
static int
devfs_unmount( struct mount *mp, int mntflags, struct proc *p)
{
struct devfsmount *devfs_mp_p = (struct devfsmount *)mp->mnt_data;
+ int flags = 0;
+ int error;
+
+ if (mntflags & MNT_FORCE) {
+ flags |= FORCECLOSE;
+ }
+ error = vflush(mp, NULLVP, flags);
+ if (error)
+ return error;
DBPRINT(("unmount "));
devfs_free_plane(devfs_mp_p);
>Audit-Trail:
>Unformatted:
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