On Linux/x86_64,

b2d84e9f9cccbe4ee662f7002b83105629d09939 is the first bad commit
commit b2d84e9f9cccbe4ee662f7002b83105629d09939
Author: Julian Brown <jul...@codesourcery.com>
Date:   Thu Feb 4 10:13:22 2021 -0800

    openacc: Tests for character types in derived-type mappings

caused

FAIL: gfortran.dg/goacc/derived-chartypes-1.f90   -O  (internal compiler error)
FAIL: gfortran.dg/goacc/derived-chartypes-1.f90   -O  (test for excess errors)
FAIL: gfortran.dg/goacc/derived-chartypes-2.f90   -O  (internal compiler error)
FAIL: gfortran.dg/goacc/derived-chartypes-2.f90   -O  (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-7113/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="goacc.exp=gfortran.dg/goacc/derived-chartypes-1.f90 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="goacc.exp=gfortran.dg/goacc/derived-chartypes-1.f90 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="goacc.exp=gfortran.dg/goacc/derived-chartypes-1.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="goacc.exp=gfortran.dg/goacc/derived-chartypes-1.f90 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="goacc.exp=gfortran.dg/goacc/derived-chartypes-2.f90 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="goacc.exp=gfortran.dg/goacc/derived-chartypes-2.f90 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="goacc.exp=gfortran.dg/goacc/derived-chartypes-2.f90 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="goacc.exp=gfortran.dg/goacc/derived-chartypes-2.f90 
--target_board='unix{-m64\ -march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me 
at skpgkp2 at gmail dot com)

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