[Bug 1901528] Re: [Ubuntu 20.10] - When zlib acceleration is enabled, gzip fails when given multiple files larger than 5KB (gzip)

[Steve Langasek]

Hello bugproxy, or anyone else affected,

Accepted gzip into groovy-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/gzip/1.10-2ubuntu1.1
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
groovy to verification-done-groovy. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-groovy. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: gzip (Ubuntu Groovy)
       Status: Confirmed => Fix Committed

** Tags added: verification-needed verification-needed-groovy

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https://bugs.launchpad.net/bugs/1901528

Title:
  [Ubuntu 20.10] - When zlib acceleration is enabled, gzip fails when
  given multiple files larger than 5KB (gzip)

Status in Ubuntu on IBM z Systems:
  New
Status in gzip package in Ubuntu:
  Fix Released
Status in zlib package in Ubuntu:
  Invalid
Status in gzip source package in Groovy:
  Fix Committed
Status in zlib source package in Groovy:
  Invalid

Bug description:
  When zlib acceleration is enabled, gzip fails when given multiple
  files larger than 5KB.

  This problem does not happen when running gzip against a single file
  at a time. It only happens when you provide multiple files as gzip
  arguments.

  So this works whether zlib acceleration is enabled or not:

  for file in file1 file2; do gzip $file ; done

  But this fails (when zlib acceleration is enabled):

  gzip file1 file2

  The patch to fix this has been accepted upstream:
  https://git.savannah.gnu.org/cgit/gzip.git/commit/?id=be0a534ba2b6e77da289de8da79e70843b1028cc

  [Impact]

   * With zlib acceleration enabled, attempting to compress multiple files
     over 5MB would cause a segmentation fault.

   * The files could still be compressed in separate commands

  [Test Case]

   * Create two files that are larger than 5MB

   * Enable zlib acceleration (z15 hardware required)

   * Run the command gzip <file1> <file2>

   * NOTE: we do not have access to z15 hardware and therefore are relying
     on IBM to verify this fix

  [Where problems could occur]

   * Due to lack of testing resources, it's possible the bug has not been
     fully fixed, and the segmentation fault could still occur.

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