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

[Christian Ehrhardt ]

Another crash with 20200507 at first try:

/root/qemu-5.0/fpu/softfloat.c: In function ‘float128_div’:
/root/qemu-5.0/fpu/softfloat.c:7504:1: internal compiler error: Segmentation fault
 7504 | }
      | ^

0x5518cb crash_signal
	../../gcc/gcc/toplev.c:328
0x43e363 add_regs_to_insn_regno_info
	../../gcc/gcc/lra.c:1512
0x43e465 add_regs_to_insn_regno_info
	../../gcc/gcc/lra.c:1534
0x43e465 add_regs_to_insn_regno_info
	../../gcc/gcc/lra.c:1534
0x43e51b add_regs_to_insn_regno_info
	../../gcc/gcc/lra.c:1538
0x43f497 lra_update_insn_regno_info(rtx_insn*)
	../../gcc/gcc/lra.c:1627
0x43f5dd lra_update_insn_regno_info(rtx_insn*)
	../../gcc/gcc/lra.c:1620
0x43f5dd lra_push_insn_1
	../../gcc/gcc/lra.c:1777
0x4579fb spill_pseudos
	../../gcc/gcc/lra-spills.c:542
0x4579fb lra_spill()
	../../gcc/gcc/lra-spills.c:655
0x4406bf lra(_IO_FILE*)
	../../gcc/gcc/lra.c:2557
0x411f05 do_reload
	../../gcc/gcc/ira.c:5523
0x411f05 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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