On Linux/x86_64,

329ae1d7751346ba166d34e77a43e8cc33daa1c9 is the first bad commit
commit 329ae1d7751346ba166d34e77a43e8cc33daa1c9
Author: Nathan Sidwell <nat...@acm.org>
Date:   Wed Dec 2 07:35:23 2020 -0800

    c++: Extend build_array_type API

caused

FAIL: g++.dg/template/canon-type-4.C  -std=c++17 (internal compiler error)
FAIL: g++.dg/template/canon-type-4.C  -std=c++17 (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-5663/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=g++.dg/template/canon-type-4.C --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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