Date: Wed, 10 Mar 1999 08:47:25 -0800 (PST) From: Cy Schubert <cy@cschuber.net.gov.bc.ca> To: FreeBSD-gnats-submit@freebsd.org Subject: kern/10528: MFS problem, syncing filesystems... giving up Message-ID: <199903101647.IAA17487@cwsys.cwsent.com>
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>Number: 10528
>Category: kern
>Synopsis: MFS fails to die when system shut down
>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 Mar 10 08:50:00 PST 1999
>Closed-Date:
>Last-Modified:
>Originator: Cy Schubert
>Release: FreeBSD 3.1-RELEASE i386
>Organization:
ITSD, Province of BC
>Environment:
FreeBSD cwsys 3.1-RELEASE FreeBSD 3.1-RELEASE #0: Wed Mar 10 06:26:02 PST 1999 root@cwsys:/usr/src/sys/compile/CWSYS i386
>Description:
When 3.1.0 is shut down, message "syncing filesystems... giving
up" is displayed and all filesystems are dirty when system is
subsequently rebooted. It appears that the difference (that
is causing this problem) is that the P_SYSTEM flag is set
for MFS when it first starts causing it to be unkillable by
the system unless it is specifically listed in a kill
command or via a umount.
>How-To-Repeat:
Mount an MFS filesystem and use it, then reboot. There need
to be dirty buffers that need to be synced to MFS to exploit
this bug, IMO 80% of the time.
>Fix:
--- src/sys/ufs/mfs/mfs_vfsops.c.orig Thu Dec 31 20:14:11 1998
+++ src/sys/ufs/mfs/mfs_vfsops.c Wed Mar 10 07:58:24 1999
@@ -423,8 +423,10 @@
if (dounmount(mp, 0, p) != 0)
CLRSIG(p, CURSIG(p)); /* try sleep again.. */
}
- else if (tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
+ else if (tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0)) {
gotsig++; /* try to unmount in next pass */
+ curproc->p_flag &= ~P_SYSTEM;
+ }
}
return (0);
}
>Release-Note:
>Audit-Trail:
>Unformatted:
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