[Bug 1890435] Re: gcc-10 breaks on armhf (flaky): internal compiler error: Segmentation fault

[dann frazier]

I've been able to reproduce reliably on X-Gene gear when running in a
KVM instance. I have not been able to reproduce outside of KVM, nor on
an alternate SoC (Hi1616). I *can* reproduce on a xenial kvm guest
running on a xenial X-Gene host - which suggests that correlation with
the LP builder upgrade is likely just coincidence. I also tried an older
xenial guest kernel just in case there was a kernel patch that was
backported to all releases that may have broke things - but I was also
able to reproduce there.

If I were to draw a conclusion at this stage, it would be that there may
very well be a low level issue causing this but, if so, it is unlikely a
new one.

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https://bugs.launchpad.net/bugs/1890435

Title:
  gcc-10 breaks on armhf (flaky): internal compiler error: Segmentation
  fault

Status in Groovy:
  New
Status in gcc-10 package in Ubuntu:
  Confirmed

Bug description:
  Hi,
  this could be the same as bug 1887557 but as I don't have enough data I'm filing it as individual issue for now.

  I have only seen this happening on armhf so far.
  In 2 of 5 groovy builds of qemu 5.0 this week I have hit the issue, but it is flaky.

  Flakyness:
  1. different file
  first occurrence
  /<<PKGBUILDDIR>>/target/s390x/excp_helper.c:544:1: internal compiler error: Segmentation fault
  second occurrence
  /<<PKGBUILDDIR>>/linux-user/syscall.c:12479:1: internal compiler error: Segmentation fault

  Being so unreliable I can't provide mcuh more yet.
  I filed it mostly for awareness and so that I can be dup'ed onto the right but if there is a better one.

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