graphic: 0.858 instruction: 0.841 device: 0.793 vnc: 0.511 boot: 0.434 semantic: 0.428 socket: 0.127 mistranslation: 0.126 network: 0.073 other: 0.059 assembly: 0.026 KVM: 0.020 Data race with state field of ThreadPoolElement Description of problem: A data race in the access of `ThreadPoolElement` state field in `util/thread-pool.c` was identified using TSAN. Steps to reproduce: ```sh QEMU_BUILD_DIR= QEMU_DIR= configure --enable-tsan --cc=clang --cxx=clang++ --enable-trace-backends=ust --enable-fdt=system --disable-slirp make tests/unit/test-thread-pool MALLOC_PERTURB_=111 G_TEST_SRCDIR=$QEMU_BUILD_DIR/tests/unit G_TEST_BUILDDIR=$QEMU_BUILD_DIR/tests/unit $QEMU_BUILD_DIR/tests/unit/test-thread-pool --tap -k ```