[Bug 2100598] Re: SIGILL on s390x

[Andreas Hasenack]

I did a revert of [2], and uploaded to this PPA[3]. The PPA has proposed
enabled.

Building started.

1. https://git.launchpad.net/~ahasenack/ubuntu/+source/gzip/commit/?id=389a495334db07cc37b1e2a2fa2d51f2c83fddd3
2. https://launchpad.net/ubuntu/+source/gzip/1.13-1ubuntu2
3. https://launchpad.net/~ahasenack/+archive/ubuntu/gzip-sigill

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https://bugs.launchpad.net/bugs/2100598

Title:
  dfltcc.c FTBFS on s390x

Status in Ubuntu on IBM z Systems:
  New
Status in gzip package in Ubuntu:
  New
Status in gzip source package in Plucky:
  New

Bug description:
  I'm still gathering information about this bug.

  UPDATE #1: see comment #2, this started out as an FTBFS.

  Reportedly there was a SIGILL on gzip/s390x such that the hardware
  acceleration on that platform for gzip had to be disabled in an
  upload[1].

  I found a matrix thread[2] about it.

  Looks like it happened during a PPA build[3]:

  (...)
  /usr/bin/make  check-recursive
  make[2]: Entering directory '/<<PKGBUILDDIR>>/builddir'
  Making check in lib
  make[3]: Entering directory '/<<PKGBUILDDIR>>/builddir/lib'
  /usr/bin/make  check-am
  make[4]: Entering directory '/<<PKGBUILDDIR>>/builddir/lib'
  make[4]: Leaving directory '/<<PKGBUILDDIR>>/builddir/lib'
  make[3]: Leaving directory '/<<PKGBUILDDIR>>/builddir/lib'
  Making check in doc
  make[3]: Entering directory '/<<PKGBUILDDIR>>/builddir/doc'
  make[3]: Nothing to be done for 'check'.
  make[3]: Leaving directory '/<<PKGBUILDDIR>>/builddir/doc'
  Making check in .
  make[3]: Entering directory '/<<PKGBUILDDIR>>/builddir'
  /usr/bin/make  check-local
  make[4]: Entering directory '/<<PKGBUILDDIR>>/builddir'
  ./gzip < ../gzip.doc >gzip.doc.gz-t && mv gzip.doc.gz-t gzip.doc.gz
  PATH=.:$PATH; { test '..' != . \
         || zdiff gzip.doc.gz; }
  PATH=.:$PATH; zdiff ../gzip.doc ../gzip.doc
  PATH=.:$PATH; zdiff ../gzip.doc gzip.doc.gz
  Illegal instruction (core dumped)
  (...)

  Apparently it hapepns[4] when "#define <stdalign.h>" is added? Perhaps
  to fix an FTBFS in plucky?

  """
  if you want to reproduce, take the upload Simon just sponsored, re-enable the DFLTCC instruction in debian/rules, then add #define <stdalign.h> to the includes at the top of dfltcc.c as a Quilt patch so that the code actually builds, then build it in a PPA with s390x enabled, and that'll happen. Probably you can unearth the ~danger2 build from my PPA though
  """

  1. https://launchpad.net/ubuntu/+source/gzip/1.13-1ubuntu2
  2. https://matrix.to/#/!QMtJBibTYYOCvXJEdv:ubuntu.com/$XXeSHgSv1gpBMQ2fG_8S9ZJWjP31rsXY8qY2cCmFkrI?via=ubuntu.com&via=matrix.org&via=matrix.debian.social
  3. https://launchpadlibrarian.net/776055235/buildlog_ubuntu-plucky-s390x.gzip_1.13-1ubuntu2~danger2_BUILDING.txt.gz
  4. https://matrix.to/#/!QMtJBibTYYOCvXJEdv:ubuntu.com/$QuKmfVGi7rtB8LXGC5fkiBDsg2ydqABLB3eWEtthgVw?via=ubuntu.com&via=matrix.org&via=matrix.debian.social

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