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

[Christian Ehrhardt ]

3 full runs good with r10-7093 but then I got:

/root/qemu-5.0/disas/nanomips.cpp: In member function ‘std::string NMD::JALRC_HB(uint64)’:
/root/qemu-5.0/disas/nanomips.cpp:7969:1: internal compiler error: Segmentation fault
 7969 | }
      | ^
0x602fa7 crash_signal
	../../gcc/gcc/toplev.c:328
0x4f1f47 add_regs_to_insn_regno_info
	../../gcc/gcc/lra.c:1509
0x4f203b add_regs_to_insn_regno_info
	../../gcc/gcc/lra.c:1531
0x4f3061 lra_update_insn_regno_info(rtx_insn*)
	../../gcc/gcc/lra.c:1624
0x505ca7 process_insn_for_elimination
	../../gcc/gcc/lra-eliminations.c:1322
0x505ca7 lra_eliminate(bool, bool)
	../../gcc/gcc/lra-eliminations.c:1372
0x500877 lra_constraints(bool)
	../../gcc/gcc/lra-constraints.c:4856
0x4f4237 lra(_IO_FILE*)
	../../gcc/gcc/lra.c:2437
0x4c5c59 do_reload
	../../gcc/gcc/ira.c:5523
0x4c5c59 execute
	../../gcc/gcc/ira.c:5709

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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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