tests/docker: Added docker build support for TSan.

Added a new docker for ubuntu 20.04.
This docker has support for Thread Sanitizer
including one patch we need in one of the header files.
https://github.com/llvm/llvm-project/commit/a72dc86cd

This command will build with tsan enabled:
make docker-test-tsan-ubuntu2004 V=1

Also added the TSAN suppresion file to disable certain
cases of TSAN warnings.

Cc: Fam Zheng <fam@euphon.net>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: NRobert Foley <robert.foley@linaro.org>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: NAlex Bennée <alex.bennee@linaro.org>
Message-Id: <20200609200738.445-10-robert.foley@linaro.org>
Message-Id: <20200612190237.30436-13-alex.bennee@linaro.org>

tests/docker/dockerfiles/ubuntu2004.docker

+FROM ubuntu:20.04
+ENV PACKAGES flex bison \
+    ccache \
+    clang-10\
+    gcc \
+    gettext \
+    git \
+    glusterfs-common \
+    libaio-dev \
+    libattr1-dev \
+    libbrlapi-dev \
+    libbz2-dev \
+    libcacard-dev \
+    libcap-ng-dev \
+    libcurl4-gnutls-dev \
+    libdrm-dev \
+    libepoxy-dev \
+    libfdt-dev \
+    libgbm-dev \
+    libgtk-3-dev \
+    libibverbs-dev \
+    libiscsi-dev \
+    libjemalloc-dev \
+    libjpeg-turbo8-dev \
+    liblzo2-dev \
+    libncurses5-dev \
+    libncursesw5-dev \
+    libnfs-dev \
+    libnss3-dev \
+    libnuma-dev \
+    libpixman-1-dev \
+    librados-dev \
+    librbd-dev \
+    librdmacm-dev \
+    libsasl2-dev \
+    libsdl2-dev \
+    libseccomp-dev \
+    libsnappy-dev \
+    libspice-protocol-dev \
+    libspice-server-dev \
+    libssh-dev \
+    libusb-1.0-0-dev \
+    libusbredirhost-dev \
+    libvdeplug-dev \
+    libvte-2.91-dev \
+    libxen-dev \
+    libzstd-dev \
+    make \
+    python3-yaml \
+    python3-sphinx \
+    sparse \
+    texinfo \
+    xfslibs-dev\
+    vim
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get -y install $PACKAGES
+RUN dpkg -l $PACKAGES | sort > /packages.txt
+ENV FEATURES clang tsan pyyaml sdl2
+
+# https://bugs.launchpad.net/qemu/+bug/1838763
+ENV QEMU_CONFIGURE_OPTS --disable-libssh
+
+# Apply patch https://reviews.llvm.org/D75820
+# This is required for TSan in clang-10 to compile with QEMU.
+RUN sed -i 's/^const/static const/g' /usr/lib/llvm-10/lib/clang/10.0.0/include/sanitizer/tsan_interface.h

tests/docker/test-tsan

+#!/bin/bash -e
+#
+# This test will use TSan as part of a build and a make check.
+#
+# Copyright (c) 2020 Linaro
+# Copyright (c) 2016 Red Hat Inc.
+#
+# Authors:
+#  Robert Foley <robert.foley@linaro.org>
+#  Originally based on test-quick from Fam Zheng <famz@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2
+# or (at your option) any later version. See the COPYING file in
+# the top-level directory.
+
+. common.rc
+
+setup_tsan()
+{
+    requires clang tsan
+    tsan_log_dir="/tmp/qemu-test/build/tsan"
+    mkdir -p $tsan_log_dir > /dev/null || true
+    EXTRA_CONFIGURE_OPTS="${EXTRA_CONFIGURE_OPTS} --enable-tsan \
+                          --cc=clang-10 --cxx=clang++-10 \
+                          --disable-werror --extra-cflags=-O0"
+    # detect deadlocks is false currently simply because
+    # TSan crashes immediately with deadlock detector enabled.
+    # We have maxed out the history size to get the best chance of finding
+    # warnings during testing.
+    # Note, to get TSan to fail on warning, use exitcode=66 below.
+    tsan_opts="suppressions=/tmp/qemu-test/src/tests/tsan/suppressions.tsan\
+               detect_deadlocks=false history_size=7\
+               halt_on_error=0 exitcode=0 verbose=5\
+               log_path=$tsan_log_dir/tsan_warning"
+    export TSAN_OPTIONS="$tsan_opts"
+}
+
+cd "$BUILD_DIR"
+
+TARGET_LIST=${TARGET_LIST:-$DEF_TARGET_LIST} \
+setup_tsan
+build_qemu
+check_qemu
+install_qemu

tests/tsan/blacklist.tsan

+# This is an example blacklist.
+# To enable use of the blacklist add this to configure:
+# "--extra-cflags=-fsanitize-blacklist=<src path>/tests/tsan/blacklist.tsan"
+# The eventual goal would be to fix these warnings.
+
+# TSan is not happy about setting/getting of dirty bits,
+# for example, cpu_physical_memory_set_dirty_range,
+# and cpu_physical_memory_get_dirty.
+src:bitops.c
+src:bitmap.c

tests/tsan/suppressions.tsan

+# This is the set of runtime suppressions of TSan warnings.
+# The goal would be to have here only items we do not
+# plan to fix, and to explain why for each item.
+
+# TSan reports a double lock on RECURSIVE mutexes.
+# Since the recursive lock is intentional, we choose to ignore it.
+mutex:aio_context_acquire
+mutex:pthread_mutex_lock
+
+# TSan reports a race betwen pthread_mutex_init() and
+# pthread_mutex_lock().  Since this is outside of QEMU,
+# we choose to ignore it.
+race:pthread_mutex_init
+race:pthread_mutex_lock