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"""
Tests basic ThreadSanitizer support (detecting a data race).
"""
import os, time
import lldb
from lldbsuite.test.lldbtest import *
from lldbsuite.test.decorators import *
import lldbsuite.test.lldbutil as lldbutil
import json
class TsanBasicTestCase(TestBase):
mydir = TestBase.compute_mydir(__file__)
@expectedFailureAll(oslist=["linux"], bugnumber="non-core functionality, need to reenable and fix later (DES 2014.11.07)")
@skipIfFreeBSD # llvm.org/pr21136 runtimes not yet available by default
@skipIfRemote
@skipUnlessCompilerRt
@skipUnlessThreadSanitizer
def test (self):
self.build ()
self.tsan_tests ()
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
self.line_malloc = line_number('main.c', '// malloc line')
self.line_thread1 = line_number('main.c', '// thread1 line')
self.line_thread2 = line_number('main.c', '// thread2 line')
def tsan_tests (self):
exe = os.path.join (os.getcwd(), "a.out")
self.expect("file " + exe, patterns = [ "Current executable set to .*a.out" ])
self.runCmd("run")
stop_reason = self.dbg.GetSelectedTarget().process.GetSelectedThread().GetStopReason()
if stop_reason == lldb.eStopReasonExec:
# On OS X 10.10 and older, we need to re-exec to enable interceptors.
self.runCmd("continue")
# the stop reason of the thread should be breakpoint.
self.expect("thread list", "A data race should be detected",
substrs = ['stopped', 'stop reason = Data race detected'])
self.assertEqual(self.dbg.GetSelectedTarget().process.GetSelectedThread().GetStopReason(), lldb.eStopReasonInstrumentation)
# test that the TSan dylib is present
self.expect("image lookup -n __tsan_get_current_report", "__tsan_get_current_report should be present",
substrs = ['1 match found'])
# We should be stopped in __tsan_on_report
process = self.dbg.GetSelectedTarget().process
thread = process.GetSelectedThread()
frame = thread.GetSelectedFrame()
self.assertTrue("__tsan_on_report" in frame.GetFunctionName())
# The stopped thread backtrace should contain either line1 or line2 from main.c.
found = False
for i in range(0, thread.GetNumFrames()):
frame = thread.GetFrameAtIndex(i)
if frame.GetLineEntry().GetFileSpec().GetFilename() == "main.c":
if frame.GetLineEntry().GetLine() == self.line_thread1:
found = True
if frame.GetLineEntry().GetLine() == self.line_thread2:
found = True
self.assertTrue(found)
self.expect("thread info -s", "The extended stop info should contain the TSan provided fields",
substrs = ["instrumentation_class", "description", "mops"])
output_lines = self.res.GetOutput().split('\n')
json_line = '\n'.join(output_lines[2:])
data = json.loads(json_line)
self.assertEqual(data["instrumentation_class"], "ThreadSanitizer")
self.assertEqual(data["issue_type"], "data-race")
self.assertEqual(len(data["mops"]), 2)
backtraces = thread.GetStopReasonExtendedBacktraces(lldb.eInstrumentationRuntimeTypeAddressSanitizer)
self.assertEqual(backtraces.GetSize(), 0)
backtraces = thread.GetStopReasonExtendedBacktraces(lldb.eInstrumentationRuntimeTypeThreadSanitizer)
self.assertTrue(backtraces.GetSize() >= 2)
# First backtrace is a memory operation
thread = backtraces.GetThreadAtIndex(0)
found = False
for i in range(0, thread.GetNumFrames()):
frame = thread.GetFrameAtIndex(i)
if frame.GetLineEntry().GetFileSpec().GetFilename() == "main.c":
if frame.GetLineEntry().GetLine() == self.line_thread1:
found = True
if frame.GetLineEntry().GetLine() == self.line_thread2:
found = True
self.assertTrue(found)
# Second backtrace is a memory operation
thread = backtraces.GetThreadAtIndex(1)
found = False
for i in range(0, thread.GetNumFrames()):
frame = thread.GetFrameAtIndex(i)
if frame.GetLineEntry().GetFileSpec().GetFilename() == "main.c":
if frame.GetLineEntry().GetLine() == self.line_thread1:
found = True
if frame.GetLineEntry().GetLine() == self.line_thread2:
found = True
self.assertTrue(found)
self.runCmd("continue")
# the stop reason of the thread should be a SIGABRT.
self.expect("thread list", "We should be stopped due a SIGABRT",
substrs = ['stopped', 'stop reason = signal SIGABRT'])
# test that we're in pthread_kill now (TSan abort the process)
self.expect("thread list", "We should be stopped in pthread_kill",
substrs = ['pthread_kill'])
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