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

[Christian Ehrhardt ]

Ok, r10-6760 reached 20 good runs and is considered good.
Doko was so kind to build 6779 6799 6819 for me - of which 6799 will be next.

Note: I've aligned the comments to all have the same style and dropped
the untested revisions.

Updated Result Overview:
20190425 good 0 of 13
r10-2027 good 0 of 4
r10-3040 good 0 of 4
r10-3400 good 0 of 4
r10-3657 good 0 of 5
r10-3727 good 0 of 3
r10-4054 other kind of bad 1 of 18 (signature different)
r10-6080 good 0 of 10
r10-6586 good 0 of 27
r10-6760 good 0 of 20
r10-6779 untested
r10-6799 next
r10-6819 untested
r10-6839 bad 2 of 9
r10-7093 bad 2 of 19
20200507 bad 3 of 7

Signatures:
r10-4054 arm_legitimate_address_p (nonimmediate)
r10-6839 add_regs_to_insn_regno_info (lra)
r10-7093 add_regs_to_insn_regno_info (lra)
r10-7093 add_regs_to_insn_regno_info (lra)
20200507 extract_plus_operands (lra)
20200507 avoid_constant_pool_reference (lra)
20200507 add_regs_to_insn_regno_info (lra)
ubu-10.2 add_regs_to_insn_regno_info (lra)
ubu-10.2 avoid_constant_pool_reference (lra)
ubu-10.2 thumb2_legitimate_address_p (lra)
ubu-10.2 add_regs_to_insn_regno_info (lra)

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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:
  Confirmed
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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