Date: Fri, 03 Mar 2006 13:11:47 -0500 From: Chad Whitacre <chad@zetaweb.com> To: freebsd-questions@freebsd.org Subject: 2 probs w/ backup.sh: "Device busy" and "dangling vnode" Message-ID: <dua0t3$sh1$1@sea.gmane.org>
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Dear All,
I am experiencing two problems with the following backup script:
#!/bin/sh
/sbin/mount /backup/
/usr/local/bin/rsync -ax --delete /usr/ /backup/
/bin/sleep 15
/sbin/umount /backup/
echo 'backup of IWS complete'
Here is the cron entry that calls it:
0 3 * * * time -h /root/backup.sh
Over the past 3 months, this script has yielded the following error
perhaps once every two weeks or so:
umount: unmount of /backup failed: Device busy
backup of IWS complete
1m28.42s real 2.60s user 6.76s sys
As a result, I upped the sleep time from 5 to 15 seconds 2 days ago.
This morning, the script seemingly caused the system to crash, given the
following evidence from /var/log/messages:
Mar 2 20:11:48 www2 ntpd[442]: kernel time sync enabled 2001
Mar 2 21:20:08 www2 ntpd[442]: kernel time sync enabled 6001
Mar 2 23:02:33 www2 ntpd[442]: kernel time sync enabled 2001
Mar 2 23:36:43 www2 ntpd[442]: kernel time sync enabled 6001
Mar 2 23:53:47 www2 ntpd[442]: kernel time sync enabled 2001
Mar 3 01:19:04 www2 ntpd[442]: kernel time sync enabled 6001
Mar 3 01:36:07 www2 ntpd[442]: kernel time sync enabled 2001
Mar 3 02:10:19 www2 ntpd[442]: kernel time sync enabled 6001
Mar 3 02:27:23 www2 ntpd[442]: kernel time sync enabled 2001
Mar 3 08:18:30 www2 syslogd: kernel boot file is
/boot/kernel/kernel
Mar 3 08:18:30 www2 kernel: panic: unmount: dangling vnode
Mar 3 08:18:30 www2 kernel: Uptime: 55d11h50m47s
Mar 3 08:18:30 www2 kernel: Dumping 511 MB (2 chunks)
Mar 3 08:18:30 www2 kernel: chunk 0: 1MB (159 pages) (CTRL-C to
abort)
Mar 3 08:18:30 www2 kernel: Dump aborted
Mar 3 08:18:30 www2 kernel: Automatic reboot in 15 seconds - press
a key on the console to abort
Mar 3 08:18:30 www2 kernel: --> Press a key on the console to
reboot,
Mar 3 08:18:30 www2 kernel: --> or switch off the system now.
Mar 3 08:18:30 www2 kernel: Rebooting...
Mar 3 08:18:30 www2 kernel: Copyright (c) 1992-2005 The FreeBSD
Project.
Mar 3 08:18:30 www2 kernel: Copyright (c) 1979, 1980, 1983, 1986,
1988, 1989, 1991, 1992, 1993, 1994
Mar 3 08:18:30 www2 kernel: The Regents of the University of
California. All rights reserved.
Mar 3 08:18:30 www2 kernel: FreeBSD 6.0-RELEASE #0: Thu Nov 3
09:36:13 UTC 2005
Mar 3 08:18:30 www2 kernel:
root@x64.samsco.home:/usr/obj/usr/src/sys/GENERIC
As you can see, the machine apparently died sometime this morning after
2:27. The front-line sysadmin (not myself) rebooted the machine this
morning at 8:18, and reports that at the "chunk 0: 1MB (159 pages)
(CTRL-C to abort)" message, the system seemed to hang, with no apparent
hard drive or other activity. He hit CTRL-C, receiving the "Automatic
reboot in 15 seconds" message, but then the system seemed to hang again,
at which point he hit CTRL-C a second time, and the machine rebooted.
Any advice on debugging these two problems?
Thank you.
Chad Whitacre
http://www.zetadev.com/
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