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

[Christian Ehrhardt ]

cc -iquote /root/qemu-5.0/b/qemu/accel/stubs -iquote accel/stubs -iquote /root/qemu-5.0/tcg/arm -isystem /root/qemu-5.0/linux-headers -isystem /root/qemu-5.0/b/qemu/linux-headers -iquote . -iquote /root/qemu-5.0 -iquote /root/qemu-5.0/accel/tcg -iquote /root/qemu-5.0/include -iquote /root/qemu-5.0/disas/libvixl -I/usr/include/pixman-1   -pthread -I/usr/include/glib-2.0 -I/usr/lib/arm-linux-gnueabihf/glib-2.0/include -pthread -I/usr/include/glib-2.0 -I/usr/lib/arm-linux-gnueabihf/glib-2.0/include -fPIE -DPIE  -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -fwrapv -std=gnu99  -g -O2 -fdebug-prefix-map=/root/qemu-5.0=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wexpansion-to-defined -Wendif-labels -Wno-shift-negative-value -Wno-missing-include-dirs -Wempty-body -Wnested-externs -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wold-style-declaration -Wold-style-definition -Wtype-limits -fstack-protector-strong -I/usr/include/p11-kit-1  -DSTRUCT_IOVEC_DEFINED  -I/usr/include/libpng16  -I/root/qemu-5.0/capstone/include -isystem ../linux-headers -iquote .. -iquote /root/qemu-5.0/target/xtensa -DNEED_CPU_H -iquote /root/qemu-5.0/include -MMD -MP -MT accel/stubs/hax-stub.o -MF accel/stubs/hax-stub.d -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -g   -c -o accel/stubs/hax-stub.o /root/qemu-5.0/accel/stubs/hax-stub.c
0x532d6b crash_signal
	../../src/gcc/toplev.c:328
0x71769f thumb2_legitimate_address_p
	../../src/gcc/config/arm/arm.c:8500
0x717c15 arm_legitimate_address_p(machine_mode, rtx_def*, bool)
	../../src/gcc/config/arm/arm.c:8917
0x717c15 arm_legitimate_address_p(machine_mode, rtx_def*, bool)
	../../src/gcc/config/arm/arm.c:8912
0x427eef valid_address_p
	../../src/gcc/lra-constraints.c:331
0x427eef simplify_operand_subreg
	../../src/gcc/lra-constraints.c:1514
0x4287ed curr_insn_transform
	../../src/gcc/lra-constraints.c:3946
0x42c133 lra_constraints(bool)
	../../src/gcc/lra-constraints.c:5031
0x41f483 lra(_IO_FILE*)
	../../src/gcc/lra.c:2443
0x3f0915 do_reload
	../../src/gcc/ira.c:5527
0x3f0915 execute
	../../src/gcc/ira.c:5713

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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-10 package in Ubuntu:
  New

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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