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

[Christian Ehrhardt ]

The extra checks that are enabled trigger the same issues I was seeing
with gcc-snapshot (maybe they have it enabled as well?).

/root/qemu-5.0/linux-user/syscall.c: In function ‘do_setsockopt’:
/root/qemu-5.0/linux-user/syscall.c:1935:17: note: non-delegitimized UNSPEC UNSPEC_PIC_SYM (1) found in variable location
 1935 | static abi_long do_setsockopt(int sockfd, int level, int optname,
      |                 ^~~~~~~~~~~~~
...
/root/qemu-5.0/linux-user/syscall.c: In function ‘do_syscall1.constprop’:
/root/qemu-5.0/linux-user/syscall.c:7674:17: note: non-delegitimized UNSPEC UNSPEC_PIC_SYM (1) found in variable location
 7674 | static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
      |                 ^~~~~~~~~~~
/root/qemu-5.0/linux-user/syscall.c:7674:17: note: non-delegitimized UNSPEC UNSPEC_PIC_SYM (1) found in variable location
/root/qemu-5.0/linux-user/syscall.c:7674:17: note: non-delegitimized UNSPEC UNSPEC_PIC_SYM (1) found in variable location
...


I see many of those, but all are only "note:" level and when searching for the actual issue I now find this more verbose output (next comment for readability):

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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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