pythongh-112536: Add support for thread sanitizer (TSAN) (pythongh-112648)

Author: samety

Diff for: Doc/using/configure.rst

@@ -745,6 +745,13 @@ Debug options
 
    .. versionadded:: 3.6
 
+.. option:: --with-thread-sanitizer
+
+   Enable ThreadSanitizer data race detector, ``tsan``
+   (default is no).
+
+   .. versionadded:: 3.13
+
 
 Linker options
 --------------

Diff for: Include/pyport.h

@@ -563,6 +563,11 @@ extern "C" {
 #      define _Py_ADDRESS_SANITIZER
 #    endif
 #  endif
+#  if __has_feature(thread_sanitizer)
+#    if !defined(_Py_THREAD_SANITIZER)
+#      define _Py_THREAD_SANITIZER
+#    endif
+#  endif
 #elif defined(__GNUC__)
 #  if defined(__SANITIZE_ADDRESS__)
 #    define _Py_ADDRESS_SANITIZER

Diff for: Lib/test/libregrtest/utils.py

@@ -340,6 +340,9 @@ def get_build_info():
     # --with-undefined-behavior-sanitizer
     if support.check_sanitizer(ub=True):
         sanitizers.append("UBSAN")
+    # --with-thread-sanitizer
+    if support.check_sanitizer(thread=True):
+        sanitizers.append("TSAN")
     if sanitizers:
         build.append('+'.join(sanitizers))
 
@@ -634,19 +637,23 @@ def display_header(use_resources: tuple[str, ...],
     asan = support.check_sanitizer(address=True)
     msan = support.check_sanitizer(memory=True)
     ubsan = support.check_sanitizer(ub=True)
+    tsan = support.check_sanitizer(thread=True)
     sanitizers = []
     if asan:
         sanitizers.append("address")
     if msan:
         sanitizers.append("memory")
     if ubsan:
         sanitizers.append("undefined behavior")
+    if tsan:
+        sanitizers.append("thread")
     if sanitizers:
         print(f"== sanitizers: {', '.join(sanitizers)}")
         for sanitizer, env_var in (
             (asan, "ASAN_OPTIONS"),
             (msan, "MSAN_OPTIONS"),
             (ubsan, "UBSAN_OPTIONS"),
+            (tsan, "TSAN_OPTIONS"),
         ):
             options= os.environ.get(env_var)
             if sanitizer and options is not None:

Diff for: Lib/test/support/__init__.py

@@ -392,10 +392,10 @@ def skip_if_buildbot(reason=None):
         isbuildbot = False
     return unittest.skipIf(isbuildbot, reason)
 
-def check_sanitizer(*, address=False, memory=False, ub=False):
+def check_sanitizer(*, address=False, memory=False, ub=False, thread=False):
     """Returns True if Python is compiled with sanitizer support"""
-    if not (address or memory or ub):
-        raise ValueError('At least one of address, memory, or ub must be True')
+    if not (address or memory or ub or thread):
+        raise ValueError('At least one of address, memory, ub or thread must be True')
 
 
     cflags = sysconfig.get_config_var('CFLAGS') or ''
@@ -412,18 +412,23 @@ def check_sanitizer(*, address=False, memory=False, ub=False):
         '-fsanitize=undefined' in cflags or
         '--with-undefined-behavior-sanitizer' in config_args
     )
+    thread_sanitizer = (
+        '-fsanitize=thread' in cflags or
+        '--with-thread-sanitizer' in config_args
+    )
     return (
         (memory and memory_sanitizer) or
         (address and address_sanitizer) or
-        (ub and ub_sanitizer)
+        (ub and ub_sanitizer) or
+        (thread and thread_sanitizer)
     )
 
 
-def skip_if_sanitizer(reason=None, *, address=False, memory=False, ub=False):
+def skip_if_sanitizer(reason=None, *, address=False, memory=False, ub=False, thread=False):
     """Decorator raising SkipTest if running with a sanitizer active."""
     if not reason:
         reason = 'not working with sanitizers active'
-    skip = check_sanitizer(address=address, memory=memory, ub=ub)
+    skip = check_sanitizer(address=address, memory=memory, ub=ub, thread=thread)
     return unittest.skipIf(skip, reason)
 
 # gh-89363: True if fork() can hang if Python is built with Address Sanitizer
@@ -432,7 +437,7 @@ def skip_if_sanitizer(reason=None, *, address=False, memory=False, ub=False):
 
 
 def set_sanitizer_env_var(env, option):
-    for name in ('ASAN_OPTIONS', 'MSAN_OPTIONS', 'UBSAN_OPTIONS'):
+    for name in ('ASAN_OPTIONS', 'MSAN_OPTIONS', 'UBSAN_OPTIONS', 'TSAN_OPTIONS'):
         if name in env:
             env[name] += f':{option}'
         else:

Diff for: Lib/test/test_io.py

@@ -1654,7 +1654,8 @@ def test_truncate_on_read_only(self):
 class CBufferedReaderTest(BufferedReaderTest, SizeofTest):
     tp = io.BufferedReader
 
-    @skip_if_sanitizer(memory=True, address=True, reason= "sanitizer defaults to crashing "
+    @skip_if_sanitizer(memory=True, address=True, thread=True,
+                       reason="sanitizer defaults to crashing "
                        "instead of returning NULL for malloc failure.")
     def test_constructor(self):
         BufferedReaderTest.test_constructor(self)
@@ -2021,7 +2022,8 @@ def test_slow_close_from_thread(self):
 class CBufferedWriterTest(BufferedWriterTest, SizeofTest):
     tp = io.BufferedWriter
 
-    @skip_if_sanitizer(memory=True, address=True, reason= "sanitizer defaults to crashing "
+    @skip_if_sanitizer(memory=True, address=True, thread=True,
+                       reason="sanitizer defaults to crashing "
                        "instead of returning NULL for malloc failure.")
     def test_constructor(self):
         BufferedWriterTest.test_constructor(self)
@@ -2520,7 +2522,8 @@ def test_interleaved_readline_write(self):
 class CBufferedRandomTest(BufferedRandomTest, SizeofTest):
     tp = io.BufferedRandom
 
-    @skip_if_sanitizer(memory=True, address=True, reason= "sanitizer defaults to crashing "
+    @skip_if_sanitizer(memory=True, address=True, thread=True,
+                       reason="sanitizer defaults to crashing "
                        "instead of returning NULL for malloc failure.")
     def test_constructor(self):
         BufferedRandomTest.test_constructor(self)

Diff for: Misc/NEWS.d/next/Build/2023-12-17-18-23-02.gh-issue-112536.8lr3Ep.rst

@@ -0,0 +1 @@
+Add support for thread sanitizer (TSAN)

Diff for: configure

@@ -3067,6 +3067,24 @@ AC_MSG_RESULT([no])
 with_ubsan="no"
 ])
 
+AC_MSG_CHECKING([for --with-thread-sanitizer])
+AC_ARG_WITH(
+  [thread_sanitizer],
+  [AS_HELP_STRING(
+    [--with-thread-sanitizer],
+    [enable ThreadSanitizer data race detector, 'tsan' (default is no)]
+  )],
+[
+AC_MSG_RESULT([$withval])
+BASECFLAGS="-fsanitize=thread $BASECFLAGS"
+LDFLAGS="-fsanitize=thread $LDFLAGS"
+with_tsan="yes"
+],
+[
+AC_MSG_RESULT([no])
+with_tsan="no"
+])
+
 # Set info about shared libraries.
 AC_SUBST([SHLIB_SUFFIX])
 AC_SUBST([LDSHARED])