>Number:         14381
>Category:       bin
>Synopsis:       tar in free() warnings when doing backups
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Oct 28 08:01:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Scott Lipcon
>Release:        NetBSD 1.5.1
>Organization:
	Scott Lipcon (slipcon@spamcop.net)
>Environment:

System: NetBSD troy.mercea.net 1.5.1 NetBSD 1.5.1 (TROY) #0: Thu Aug 23 11:50:41 EDT 2001 slipcon@troy.mercea.net:/usr/src/sys/arch/sparc/compile/TROY sparc

Machine is a sparc 5 170mhz.  I have a Exabyte 8500 tape drive on scsi ID 5
on the motherboard controller.

st0 at scsibus0 target 5 lun 0: <EXABYTE, EXB-8500SMBANXH1, 0458> SCSI2 1/sequen
tial removable

>Description:
	I'm doing a full backup of several NFS mounted partitions, using
	tar straight to the tape drive.  I'm using the command line:

	tar -cWpvb 126 $DIRECTORIES

	where directories is a list of the NFS mounts (and parts of NFS mounts)
	that I am backing up.  All the mounts come from a single machine, 
	which is on my local (home) ethernet.  The backups are happening
	overnight, and there is next to no other traffic on the network.

	Each time I've done the backups, tar prints the following to 
	stderr:

	tar in free(): warning: chunk is already free.
	tar in free(): warning: junk pointer, too high to make sense.

	The backups appear to be fine - I was able to do a test restore of 
	a few randomly selected directories.  I don't want to find out that
	there are a few errors in there, when I need to do a full restore.

>How-To-Repeat:
	seems repeatable to me - I've seen it 3 or 4 times (the tape drive 
	is new to me, I've only done a few backups so far)
>Fix:
	don't know
>Release-Note:
>Audit-Trail:
>Unformatted: