On Linux/x86_64,

6e9ee44d96e5bda8808dd9d8ccf58d2525383f6b is the first bad commit
commit 6e9ee44d96e5bda8808dd9d8ccf58d2525383f6b
Author: Martin Uecker <uec...@tugraz.at>
Date:   Thu Apr 13 19:35:15 2023 +0200

    Reduce false positives for -Wnonnull for VLA parameters [PR98541]

caused

FAIL: gcc.dg/Wnonnull-4.c (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/export/users/haochenj/src/gcc-bisect/master/master/r14-5115/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=gcc.dg/Wnonnull-4.c 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/Wnonnull-4.c 
--target_board='unix{-m32\ -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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