travis: Enable TSAN for sanity checking the terminal UI

.ci/common/build.sh

@@ -61,6 +61,7 @@ build_nvim() {
     exit 1
   fi
 
+  if [ "$CLANG_SANITIZER" != "TSAN" ]; then
     echo "Building libnvim."
     if ! ${MAKE_CMD} libnvim; then
       exit 1
@@ -70,10 +71,15 @@ build_nvim() {
     if ! ${MAKE_CMD} nvim-test; then
       exit 1
     fi
+  fi
 
   # Invoke nvim to trigger *San early.
-  bin/nvim --version
+  if ! (bin/nvim --version && bin/nvim -u NONE -e -c ':qall'); then
-  bin/nvim -u NONE -e -c ':qall'
+    asan_check "${LOG_DIR}"
+    exit 1
+  fi
+  asan_check "${LOG_DIR}"
+  
 
   cd "${TRAVIS_BUILD_DIR}"
 }

.ci/run_tests.sh

@@ -17,8 +17,12 @@ source "${CI_DIR}/common/test.sh"
 
 build_nvim
 
+if [ "$CLANG_SANITIZER" != "TSAN" ]; then
+  # Additional threads are only created when the builtin UI starts, which
+  # doesn't happen in the unit/functional tests
   run_unittests
   run_functionaltests
+fi
 run_oldtests
 
 install_nvim

.travis.yml

@@ -77,10 +77,9 @@ matrix:
     - os: linux
       compiler: clang-3.6
       env: GCOV=llvm-cov-3.6 CLANG_SANITIZER=MSAN
-    # FIXME (tarruda): Uncomment when TSan tests don't hang anymore.
+    - os: linux
-    #- os: linux
+      compiler: clang-3.6
-    #  compiler: clang-3.6
+      env: GCOV=llvm-cov-3.6 CLANG_SANITIZER=TSAN
-    #  env: GCOV=llvm-cov-3.6 CLANG_SANITIZER=TSAN
     - os: osx
       compiler: clang
       env: GCOV=gcov