[Bug 1899621] Re: [Ubuntu 20.04] zlib: inflateSyncPoint() returns an incorrect result on z15

[Dimitri John Ledkov]

** Changed in: zlib (Ubuntu Groovy)
   Importance: Undecided => Critical

** Changed in: zlib (Ubuntu Focal)
   Importance: Undecided => Critical

** Also affects: ubuntu-release-notes
   Importance: Undecided
       Status: New

** Changed in: zlib (Ubuntu Groovy)
    Milestone: None => ubuntu-20.10

** Changed in: zlib (Ubuntu Focal)
    Milestone: None => focal-updates

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https://bugs.launchpad.net/bugs/1899621

Title:
  [Ubuntu 20.04] zlib: inflateSyncPoint() returns an incorrect result on
  z15

Status in Release Notes for Ubuntu:
  New
Status in Ubuntu on IBM z Systems:
  New
Status in zlib package in Ubuntu:
  New
Status in zlib source package in Focal:
  New
Status in zlib source package in Groovy:
  New

Bug description:
  Description:   zlib: inflateSyncPoint() returns an incorrect result on z15
  Symptom:       Certain rsync builds fail with "error in rsync protocol data
                 stream" on z15.
  Problem:       inflateSyncPoint() does not take into account the hardware
                 compression state and returns an incorrect result.
  Solution:      Make inflateSyncPoint() fail if the hardware compression is on.
                 The hardware does not provide enough information in order to
                 implement this function.
  Reproduction:  z15 only: printf 1 >1 && rsync -z 1 2

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