[Bug 2100767] [NEW] z_stream.adler doesn't match adler32() with DFLTCC

[Pushkar Kulkarni]

Public bug reported:

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/

** Affects: zlib (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: zlib (Ubuntu Jammy)
     Importance: Undecided
         Status: New


** Tags: s390x

** Also affects: zlib (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Tags added: s390x

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

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

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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