[r16-6913 Regression] FAIL: libgomp.c/pr122356.c execution test on Linux/x86_64

[Haochen Jiang]

On Linux/x86_64,

304d08fea9e68c5b4806532816b58d33a15a917d is the first bad commit
commit 304d08fea9e68c5b4806532816b58d33a15a917d
Author: Matthew Malcolmson <mmalcolmson@nvidia.com>
Date:   Tue Jan 20 03:54:51 2026 +0000

    libgomp: Ensure memory sync after performing tasks

caused

FAIL: libgomp.c/pr122356.c execution test

with GCC configured with

../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-6913/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}/x86_64-linux/libgomp/testsuite && make check RUNTESTFLAGS="c.exp=libgomp.c/pr122356.c --target_board='unix{-m32}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check RUNTESTFLAGS="c.exp=libgomp.c/pr122356.c --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check RUNTESTFLAGS="c.exp=libgomp.c/pr122356.c --target_board='unix{-m64}'"
$ cd {build_dir}/x86_64-linux/libgomp/testsuite && make check RUNTESTFLAGS="c.exp=libgomp.c/pr122356.c --target_board='unix{-m64\ -march=cascadelake}'"

(Please directly reply to this email for question about this report.)
(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.)