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

[Frank Heimes]

** Changed in: ubuntu-z-systems
       Status: New => Fix Committed

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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:
  Fix Committed
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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