[Bug 1866211] Comment bridged from LTC Bugzilla

[bugproxy]

------- Comment From arnez at de.ibm.com 2020-03-19 12:45 EDT-------
(In reply to comment #7)
> But, this patch depends on LTC-163660 which was pospoted to 20.10 release,
> and these patches don't apply cleanly without the other one.
Hm, I missed the fact that that missed the 20.10 release.  Even if that's the case, this bug should be fixed anyhow.  I'll attach a minimal patch that you can use instead.

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https://bugs.launchpad.net/bugs/1866211

Title:
  [UBUNTU 20.04] valgrind: Recognize z15 and disable deflate-conversion
  facility bit

Status in Ubuntu on IBM z Systems:
  Triaged
Status in valgrind package in Ubuntu:
  New

Bug description:
  Trying to deflate using zlib under valgrind on z15 causes an
  "unrecognised instruction" crash:

  vex s390->IR: unknown insn: B939 A024
  ==42593== valgrind: Unrecognised instruction at address 0x4acec80.
  ==42593==    at 0x4ACEC80: ??? (in /usr/lib64/libz.so.1.2.11)
  ==42593==    by 0x4AC105B: deflateResetKeep (in /usr/lib64/libz.so.1.2.11)

  In fact, the unrecognised instruction is the "deflate conversion
  call", which is not supported by Valgrind yet.  Thus Valgrind should
  have masked off the respective facility bit, but it didn't.

  Upstream commit 3a2711c659ac839934f13e0529e14d6c15325383 fixes this.
  It will be part of the next Valgrind release 3.16.0.

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