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

[Christian Ehrhardt ]

Failed on the second run with:

during RTL pass: reload
/root/qemu-5.0/fpu/softfloat.c: In function ‘soft_f64_muladd’:
/root/qemu-5.0/fpu/softfloat.c:1535:1: internal compiler error: Segmentation fault
 1535 | }
      | ^
...
0x532aeb crash_signal
	../../src/gcc/toplev.c:328
0x41ccd7 add_regs_to_insn_regno_info
	../../src/gcc/lra.c:1515
0x41cdd9 add_regs_to_insn_regno_info
	../../src/gcc/lra.c:1537
0x41cdd9 add_regs_to_insn_regno_info
	../../src/gcc/lra.c:1537
0x41de9f lra_update_insn_regno_info(rtx_insn*)
	../../src/gcc/lra.c:1630
0x42be95 lra_constraints(bool)
	../../src/gcc/lra-constraints.c:4975
0x41f093 lra(_IO_FILE*)
	../../src/gcc/lra.c:2443
0x3f0405 do_reload
	../../src/gcc/ira.c:5527
0x3f0405 execute
	../../src/gcc/ira.c:5713
Please submit a full bug report,
...
The bug is not reproducible, so it is likely a hardware or OS problem.

So we surely fixed the "TYPE_CANONICAL" issue in the checker builds.
But is this one that I hit now the same original issue we had before or a different one?
Can you derive that from the traceback?

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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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