[Bug 687594] Re: tar crashes with SIGSEGV when used with --listed-incremental option and including the root directory
Martin Pitt
martin.pitt at ubuntu.com
Sat Jan 15 00:19:55 UTC 2011
** Also affects: tar (Ubuntu Maverick)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/687594
Title:
tar crashes with SIGSEGV when used with --listed-incremental option
and including the root directory
Status in “tar” package in Ubuntu:
Fix Released
Status in “tar” source package in Maverick:
New
Status in “tar” package in Debian:
Fix Released
Bug description:
Binary package hint: tar
I have a backup script which is doing incremental backups on NFS
share. I am using an -g (--listed-incremental) option for that
purpose. If the snapshot file does not exists (which means tar is
doing full backups) everything works flawlessly. The problem occur
whenever incremental backup has to be taken. Tar crashes immediately
with Segmentation Fault error. I have tried to isolate NFS issues and
copied the snapshot file to local storage and instructed tar to put
the archive to local drive as well. The result was exactly the same.
The problem occurs whenever the root directory "/" is included in the
backup.
TEST CASE:
$ tar cpf /tmp/test.tar -g /tmp/snap / --exclude="*"
$ tar cpf /tmp/test.tar -g /tmp/snap / --exclude="*"
Segmentation fault
After applying the fix in the linked branch, tar no longer segfaults. The patch is taken from this upstream commit:
http://git.savannah.gnu.org/cgit/tar.git/commit/?id=e21d54e8cd3d8026ad56f90cc6bde831106c2cb9
The bug is a regression introduced in Maverick.
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: tar 1.23-2
ProcVersionSignature: Ubuntu 2.6.35-22.35-server 2.6.35.4
Uname: Linux 2.6.35-22-server x86_64
Architecture: amd64
Date: Thu Dec 9 00:12:35 2010
InstallationMedia: Ubuntu-Server 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: tar
== Regression details ==
Discovered in version: 1.23-2
Last known good version: 1.22-2ubuntu1
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