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

[Christian Ehrhardt ]

On BareMetal now also triggered with -j1 (but there were multiple LXD
containers each running -j1 to increase the chance to find it).

/root/qemu-5.0/memory.c: In function ‘memory_region_write_accessor’:
/root/qemu-5.0/memory.c:485:1: internal compiler error: Segmentation fault
  485 | }
      | ^
0x56715f crash_signal
        ../../gcc/gcc/toplev.c:327
0x4599ad add_regs_to_insn_regno_info
        ../../gcc/gcc/lra.c:1445
0x459ab9 add_regs_to_insn_regno_info
        ../../gcc/gcc/lra.c:1537
0x459ab9 add_regs_to_insn_regno_info
        ../../gcc/gcc/lra.c:1537
0x45abc7 lra_update_insn_regno_info(rtx_insn*)
        ../../gcc/gcc/lra.c:1630
0x468985 lra_constraints(bool)
        ../../gcc/gcc/lra-constraints.c:5077
0x45bc15 lra(_IO_FILE*)
        ../../gcc/gcc/lra.c:2329
0x42d463 do_reload
        ../../gcc/gcc/ira.c:5802
0x42d463 execute
        ../../gcc/gcc/ira.c:5988
Please submit a full bug report,
with preprocessed source if appropriate.

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

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

Status in gcc:
  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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