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From: "ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/102772] [12 regression] g++.dg/torture/pr80334.C FAILs
Date: Tue, 23 Nov 2021 12:36:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102772

--- Comment #7 from Rainer Orth <ro at gcc dot gnu.org> ---
There's another instance of the same problem:

libgomp.fortran/pointer2.f90 FAILs at -O2 and above:

FAIL: libgomp.fortran/pointer2.f90   -O2  execution test
FAIL: libgomp.fortran/pointer2.f90   -O3 -fomit-frame-pointer -funroll-loops
-fpeel-loops -ftracer -finline-functions  execution test
FAIL: libgomp.fortran/pointer2.f90   -O3 -g  execution test

Program received signal SIGSEGV: Segmentation fault - invalid memory refere=
nce.

Backtrace for this error:
Segmentation Fault

Thread 9 received signal SIGSEGV, Segmentation fault.
[Switching to Thread 2 (LWP 2)]
0x080517ba in MAIN__::MAIN__._omp_fn.0 () at
/vol/gcc/src/hg/master/local/libgomp/testsuite/libgomp.fortran/pointer2.f90=
:14
14      !$omp parallel copyin (thr) reduction(.or.:l) reduction(+:i)
1: x/i $pc
=3D> 0x80517ba <MAIN__::MAIN__._omp_fn.0+42>:     movaps %xmm7,-0x28(%ebx)
(gdb) where
#0  0x080517ba in MAIN__::MAIN__._omp_fn.0 () at
/vol/gcc/src/hg/master/local/libgomp/testsuite/libgomp.fortran/pointer2.f90=
:14
#1  0xfe2d40dc in gomp_thread_start (xdata=3D<optimized out>) at
/vol/gcc/src/hg/master/local/libgomp/team.c:129
#2  0xfdfd327b in _thrp_setup () from /lib/libc.so.1
#3  0xfdfd35b0 in ?? () from /lib/libc.so.1
#4  0x00000000 in ?? ()
(gdb) p/x $ebx
$1 =3D 0xfe1202c0
(gdb) p/x $ebx-0x28
$2 =3D 0xfe120298

so this is another unaligned access, it seems.=