[Bug target/97866] New: [11 Regression] bootstrap error in libasan building a s390x-linux-gnu cross compiler

[Bug target/97866] New: [11 Regression] bootstrap error in libasan building a s390x-linux-gnu cross compiler

[doko at debian dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97866

            Bug ID: 97866
           Summary: [11 Regression] bootstrap error in libasan building a
                    s390x-linux-gnu cross compiler
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at debian dot org
  Target Milestone: ---

seen with trunk 20201114

while the error message says it's not reproducible, the build stops 10 times
with the same result.

during RTL pass: reload
../../../../src/libsanitizer/asan/asan_fake_stack.cpp: In member function 'void
__asan::FakeStack::For
EachFakeFrame(__sanitizer::RangeIteratorCallback, void*)':
../../../../src/libsanitizer/asan/asan_fake_stack.cpp:171:1: internal compiler
error: Segmentation fault
  171 | }
      | ^
0xbde03f crash_signal
        ../../src/gcc/toplev.c:330
0x7f3f99181cbf ???
        ./signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0xb550ad profile_count::initialized_p() const
        ../../src/gcc/profile-count.h:785
0xb550ad profile_count::to_frequency(function*) const
        ../../src/gcc/profile-count.c:269
0xa7cf6a get_insn_freq
        ../../src/gcc/lra.c:1555
0xa7f707 lra_update_insn_regno_info(rtx_insn*)
        ../../src/gcc/lra.c:1627
0xa7f7cd lra_update_insn_regno_info(rtx_insn*)
        ../../src/gcc/lra.c:1623
0xa7f7cd lra_push_insn_1
        ../../src/gcc/lra.c:1780
0xa806d4 lra_push_insn(rtx_insn*)
        ../../src/gcc/lra.c:1788
0xa806d4 push_insns
        ../../src/gcc/lra.c:1831
0xa806d4 push_insns
        ../../src/gcc/lra.c:1823
0xa806d4 lra_process_new_insns(rtx_insn*, rtx_insn*, rtx_insn*, char const*)
        ../../src/gcc/lra.c:1925
0xa90c42 curr_insn_transform
        ../../src/gcc/lra-constraints.c:4635
0xa92655 lra_constraints(bool)
        ../../src/gcc/lra-constraints.c:5129
0xa80e82 lra(_IO_FILE*)
        ../../src/gcc/lra.c:2323
0xa3ff01 do_reload
        ../../src/gcc/ira.c:5800
0xa3ff01 execute
        ../../src/gcc/ira.c:5986
Please submit a full bug report,
with preprocessed source if appropriate.
The bug is not reproducible, so it is likely a hardware or OS problem.
make[6]: *** [Makefile:653: asan_fake_stack.lo] Error 1
make[6]: Leaving directory
'/packages/cross/11/gcc-cross/gcc/build/s390x-linux-gnu/libsanitizer/asan'
make[5]: *** [Makefile:528: all-recursive] Error 1

[Bug target/97866] [11 Regression] bootstrap error in libasan building a s390x-linux-gnu cross compiler

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97866

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |11.0

[Bug target/97866] [11 Regression] bootstrap error in libasan building a s390x-linux-gnu cross compiler

[iii at linux dot ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97866

Ilya Leoshkevich <iii at linux dot ibm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |iii at linux dot ibm.com

--- Comment #1 from Ilya Leoshkevich <iii at linux dot ibm.com> ---
Could you please share your configure flags?

On x86_64 Ubuntu 20.04 the following worked fine:

../configure --target=s390x-linux-gnu --exec-prefix=/usr --disable-bootstrap
--disable-multilib --enable-languages=c,c++

[Bug target/97866] [11 Regression] bootstrap error in libasan building a s390x-linux-gnu cross compiler

[iii at linux dot ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97866

--- Comment #2 from Ilya Leoshkevich <iii at linux dot ibm.com> ---
Never mind, I managed to reproduce it now:

ubuntu-focal-amd64$ git rev-parse --short HEAD
77f67db2a47

ubuntu-focal-amd64$ ../configure --target=s390x-linux-gnu --exec-prefix=/usr
--disable-bootstrap --disable-multilib --enable-languages=c,c++

ubuntu-focal-amd64$ cat test.cpp
typedef long a;
typedef void (*b)(a, a, void *);
class c {
  unsigned char *m_fn1();
  char d(a);
  a e(a);
  void f();
};
b g;
void *h;
void c::f() {
  for (a j; j < 6; j++) {
    unsigned char *flags = m_fn1();
    for (a i, k; i < k; i++) {
      if (flags)
        continue;
      int *ff = reinterpret_cast<int *>(d(i));
      g(a(ff), e(j), h);
    }
  }
}

ubuntu-focal-amd64$ gcc/xgcc -Bgcc -std=gnu++14 -O2 -c test.cpp
during RTL pass: reload
test.cpp: In member function ‘void c::f()’:
test.cpp:21:1: internal compiler error: in get_insn_freq, at lra.c:1554

[Bug target/97866] [11 Regression] bootstrap error in libasan building a s390x-linux-gnu cross compiler

[iii at linux dot ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97866

--- Comment #3 from Ilya Leoshkevich <iii at linux dot ibm.com> ---
I believe it's already fixed by:

commit 253c415a1acba50711c82693426391743ac18040
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date:   Sun Nov 15 11:22:19 2020 -0500

    Do not put reload insns in the last empty BB.

    gcc/
            * lra.c (lra_process_new_insns): Don't put reload insns in the
            last empty BB.

Cherry-picking it helps, and the comment from this commit describes what is
happening here: "Do not put reload insns if it is the last BB without actual
insns.  In this case the reload insns can get null BB after emitting".

[Bug target/97866] [11 Regression] bootstrap error in libasan building a s390x-linux-gnu cross compiler

[doko at debian dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97866

Matthias Klose <doko at debian dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #4 from Matthias Klose <doko at debian dot org> ---
yes, that's fixed on the trunk