On Linux/x86_64,

7c81ff02a943cda82cc1a82b36ae8ab14470b00a is the first bad commit
commit 7c81ff02a943cda82cc1a82b36ae8ab14470b00a
Author: Paul Thomas <pa...@gcc.gnu.org>
Date:   Mon May 13 07:27:20 2024 +0100

    Fortran: Fix wrong code in unlimited polymorphic assignment [PR113363]

caused

FAIL: gfortran.dg/pr113363.f90   -O0  (internal compiler error: Segmentation 
fault)
FAIL: gfortran.dg/pr113363.f90   -O0  (test for excess errors)
FAIL: gfortran.dg/pr113363.f90   -O1  (internal compiler error: Segmentation 
fault)
FAIL: gfortran.dg/pr113363.f90   -O1  (test for excess errors)
FAIL: gfortran.dg/pr113363.f90   -O2  (internal compiler error: Segmentation 
fault)
FAIL: gfortran.dg/pr113363.f90   -O2  (test for excess errors)
FAIL: gfortran.dg/pr113363.f90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  (internal compiler error: 
Segmentation fault)
FAIL: gfortran.dg/pr113363.f90   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  (test for excess errors)
FAIL: gfortran.dg/pr113363.f90   -O3 -g  (internal compiler error: Segmentation 
fault)
FAIL: gfortran.dg/pr113363.f90   -O3 -g  (test for excess errors)
FAIL: gfortran.dg/pr113363.f90   -Os  (internal compiler error: Segmentation 
fault)
FAIL: gfortran.dg/pr113363.f90   -Os  (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/export/users/haochenj/src/gcc-bisect/gcc-13/releases/gcc-13/r13-8926/usr
 --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld 
--with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl 
--enable-libmpx x86_64-linux --disable-bootstrap

To reproduce:

$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=gfortran.dg/pr113363.f90 --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=gfortran.dg/pr113363.f90 --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=gfortran.dg/pr113363.f90 --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=gfortran.dg/pr113363.f90 --target_board='unix{-m64\ 
-march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me 
at haochen dot jiang at intel.com.)
(If you met problems with cascadelake related, disabling AVX512F in command 
line might save that.)
(However, please make sure that there is no potential problems with AVX512.)

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