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[Frank Heimes <2100767@xxxxxxxxxxxxxxxxxx>]

@Pushkar is it okay to transfer your code from the pastebin into a text
file attached here to this LP bug, so that Eduard is able to read and
follow?

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https://bugs.launchpad.net/bugs/2100767

Title:
  z_stream.adler doesn't match adler32() with DFLTCC

Status in Ubuntu on IBM z Systems:
  New
Status in zlib package in Ubuntu:
  New
Status in zlib source package in Jammy:
  New

Bug description:
  I have been observing this failure on jammy/s390x PS6 VMs off late,
  while running OpenJDK TCK certification tests.

  The test starts with an integer array representing compressed data.
  The data is inflated and we then try to assert that the z_stream.adler
  matches adler32(inflated_bytes). This check fails on jammy/s390x where
  z_stream.adler is always equal to 1. The test doesn't fail on
  plucky/s390x and noble/s390x.

  Steps to reproduce:

  =====

  $ apt list --installed | grep "zlib"
  zlib1g-dev/jammy-updates,jammy-security,now 1:1.2.11.dfsg-2ubuntu9.2 s390x
  zlib1g/jammy-updates,jammy-security,now 1:1.2.11.dfsg-2ubuntu9.2 s390x

  Create a file named test.c with this content [1]

  $ cc test.c -lz
  $ ./a.out
  The result from inf.adler & 0xffffffff = 1, adler32() = 3739031815
  failed: inf.adler doesn't match adler32()

  =====

  I built a test zlib **without** passing --dfltcc to the configure
  script and built it in ppa:pushkarnk/s390x-only-builds. Testing with
  this averts the issue.

  =====

  $ add-apt-repository ppa:pushkarnk/s390x-only
  $ apt update && apt upgrade zlib1g
  $ apt list --installed | grep "zlib"
  zlib1g-dev/jammy,now 1:1.2.11.dfsg-2ubuntu9.4 s390x [installed]
  zlib1g/jammy,now 1:1.2.11.dfsg-2ubuntu9.4 s390x [installed,automatic]

  $./a.out
  passed

  =====

  [1] https://pastebin.canonical.com/p/ppBM82mkYr/

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