Possible data races detected with ThreadSanitizer in ger_thread, ...

I built TSAN instrumented OpenBLAS with clang-18, here is the build command:

cd /project/OpenBLAS

export CC=clang-18
export CXX=clang++-18
export CFLAGS="-fsanitize=thread -g"
export CXXFLAGS="-fsanitize=thread -g"
export LDFLAGS=-fsanitize=thread

apt-get update && apt-get install -y perl --no-install-recommends
make -j 32 shared
make -j 32 install

and then I run utests with few threads:

OMP_NUM_THREADS=2 make -C utest &> make_utest.nt-2.log

ThreadSanitizer reports various data races:
https://gist.github.com/vfdev-5/7e57d305f100003aa4b9ada11efbcf0e#file-make_utest-nt-2-log

Environment info:

• linux, Ubuntu 24.04.1 LTS

# Makefile.conf
OSNAME=Linux
ARCH=x86_64
C_COMPILER=CLANG
BINARY32=
BINARY64=1
CEXTRALIB= -L/usr/bin/../lib/gcc/x86_64-linux-gnu/14 -L/usr/bin/../lib/gcc/x86_64-linux-gnu/14/../../../../lib64 -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib64 -L/lib -L/usr/lib  -lpthread -lrt -lm -ldl -lresolv -lc  /usr/lib/llvm-18/lib/clang/18/lib/linux/libclang_rt.tsan-x86_64.a
F_COMPILER=GFORTRAN
FC=gfortran
BU=_
NOFORTRAN=1
CORE=ZEN
LIBCORE=zen
NUM_CORES=128
HAVE_MMX=1
HAVE_SSE=1
HAVE_SSE2=1
HAVE_SSE3=1
HAVE_SSSE3=1
HAVE_SSE4_1=1
HAVE_SSE4_2=1
HAVE_SSE4A=1
HAVE_AVX=1
HAVE_AVX2=1
HAVE_FMA3=1
MAKEFLAGS += -j 128
SBGEMM_UNROLL_M=8
SBGEMM_UNROLL_N=4
SGEMM_UNROLL_M=8
SGEMM_UNROLL_N=4
DGEMM_UNROLL_M=4
DGEMM_UNROLL_N=8
QGEMM_UNROLL_M=2
QGEMM_UNROLL_N=2
CGEMM_UNROLL_M=8
CGEMM_UNROLL_N=2
ZGEMM_UNROLL_M=4
ZGEMM_UNROLL_N=2
XGEMM_UNROLL_M=1
XGEMM_UNROLL_N=1
CGEMM3M_UNROLL_M=8
CGEMM3M_UNROLL_N=4
ZGEMM3M_UNROLL_M=4
ZGEMM3M_UNROLL_N=4
XGEMM3M_UNROLL_M=2
XGEMM3M_UNROLL_N=2

Reproduce the report with the shown clang-18 ThreadSanitizer build and OMP_NUM_THREADS=2 make -C utest; start by reviewing the linked make_utest.nt-2.log and the ger_thread reports. Trace each reported race to its OpenBLAS source path and utest trigger, then establish which reports are real and what a clean or justified TSAN run should look like.