[Bug 687594] Re: tar crashes with SIGSEGV when used with --listed-incremental option and including the root directory

[Marcel Stimberg]

** Description changed:

  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
+   $ 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:
+ After applying the fix in the linked branch, tar no longer segfaults (you have to delete the files in /tmp created with the faulty version before). 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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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 (you have to delete the files in /tmp created with the faulty version before). 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