Fix ASAN failure in TestSingleThreadStepTimeout.py (#102208)

This PR fixes the ASAN failure in
https://github.com/llvm/llvm-project/pull/90930.

The original PR made the assumption that parent
`ThreadPlanStepOverRange`'s lifetime will always be longer than
`ThreadPlanSingleThreadTimeout` leaf plan so it passes the
`m_timeout_info` as reference to it.
From the ASAN failure, it seems that this assumption may not be true
(likely the thread stack is holding a strong reference to the leaf
plan).

This PR fixes this lifetime issue by using shared pointer instead of
passing by reference.

---------

Co-authored-by: jeffreytan81 <jeffreytan@fb.com>

lldb/include/lldb/Target/ThreadPlanSingleThreadTimeout.h

@@ -20,6 +20,7 @@
 
 namespace lldb_private {
 
+class ThreadPlanSingleThreadTimeout;
 //
 // Thread plan used by single thread execution to issue timeout. This is useful
 // to detect potential deadlock in single thread execution. The timeout measures
@@ -46,6 +47,8 @@ public:
     bool m_isAlive = false;
     ThreadPlanSingleThreadTimeout::State m_last_state = State::WaitTimeout;
   };
+  using TimeoutInfoSP =
+      std::shared_ptr<ThreadPlanSingleThreadTimeout::TimeoutInfo>;
 
   ~ThreadPlanSingleThreadTimeout() override;
 
@@ -54,11 +57,11 @@ public:
   // state. The reference of \param info is passed in so that when
   // ThreadPlanSingleThreadTimeout got popped its last state can be stored
   // in it for future resume.
-  static void PushNewWithTimeout(Thread &thread, TimeoutInfo &info);
+  static void PushNewWithTimeout(Thread &thread, TimeoutInfoSP &info);
 
   // Push a new ThreadPlanSingleThreadTimeout by restoring state from
   // input \param info and resume execution.
-  static void ResumeFromPrevState(Thread &thread, TimeoutInfo &info);
+  static void ResumeFromPrevState(Thread &thread, TimeoutInfoSP &info);
 
   void GetDescription(Stream *s, lldb::DescriptionLevel level) override;
   bool ValidatePlan(Stream *error) override { return true; }
@@ -78,7 +81,7 @@ public:
   bool StopOthers() override;
 
 private:
-  ThreadPlanSingleThreadTimeout(Thread &thread, TimeoutInfo &info);
+  ThreadPlanSingleThreadTimeout(Thread &thread, TimeoutInfoSP &info);
 
   bool IsTimeoutAsyncInterrupt(Event *event_ptr);
   bool HandleEvent(Event *event_ptr);
@@ -91,7 +94,7 @@ private:
   const ThreadPlanSingleThreadTimeout &
   operator=(const ThreadPlanSingleThreadTimeout &) = delete;
 
-  TimeoutInfo &m_info; // Reference to controlling ThreadPlan's TimeoutInfo.
+  TimeoutInfoSP m_info; // Reference to controlling ThreadPlan's TimeoutInfo.
   State m_state;
 
   // Lock for m_wakeup_cv and m_exit_flag between thread plan thread and timer

lldb/include/lldb/Target/TimeoutResumeAll.h

@@ -19,7 +19,10 @@ namespace lldb_private {
 // ResumeWithTimeout() during DoWillResume().
 class TimeoutResumeAll {
 public:
-  TimeoutResumeAll(Thread &thread) : m_thread(thread) {}
+  TimeoutResumeAll(Thread &thread)
+      : m_thread(thread),
+        m_timeout_info(
+            std::make_shared<ThreadPlanSingleThreadTimeout::TimeoutInfo>()) {}
 
   void PushNewTimeout() {
     ThreadPlanSingleThreadTimeout::PushNewWithTimeout(m_thread, m_timeout_info);
@@ -32,7 +35,7 @@ public:
 
 private:
   Thread &m_thread;
-  ThreadPlanSingleThreadTimeout::TimeoutInfo m_timeout_info;
+  ThreadPlanSingleThreadTimeout::TimeoutInfoSP m_timeout_info;
 };
 
 } // namespace lldb_private

lldb/source/Target/ThreadPlanSingleThreadTimeout.cpp

@@ -24,19 +24,19 @@
 using namespace lldb_private;
 using namespace lldb;
 
-ThreadPlanSingleThreadTimeout::ThreadPlanSingleThreadTimeout(Thread &thread,
-                                                             TimeoutInfo &info)
+ThreadPlanSingleThreadTimeout::ThreadPlanSingleThreadTimeout(
+    Thread &thread, TimeoutInfoSP &info)
     : ThreadPlan(ThreadPlan::eKindSingleThreadTimeout, "Single thread timeout",
                  thread, eVoteNo, eVoteNoOpinion),
       m_info(info), m_state(State::WaitTimeout) {
   // TODO: reuse m_timer_thread without recreation.
   m_timer_thread = std::thread(TimeoutThreadFunc, this);
-  m_info.m_isAlive = true;
-  m_state = m_info.m_last_state;
+  m_info->m_isAlive = true;
+  m_state = m_info->m_last_state;
 }
 
 ThreadPlanSingleThreadTimeout::~ThreadPlanSingleThreadTimeout() {
-  m_info.m_isAlive = false;
+  m_info->m_isAlive = false;
 }
 
 uint64_t ThreadPlanSingleThreadTimeout::GetRemainingTimeoutMilliSeconds() {
@@ -66,7 +66,7 @@ std::string ThreadPlanSingleThreadTimeout::StateToString(State state) {
 }
 
 void ThreadPlanSingleThreadTimeout::PushNewWithTimeout(Thread &thread,
-                                                       TimeoutInfo &info) {
+                                                       TimeoutInfoSP &info) {
   uint64_t timeout_in_ms = thread.GetSingleThreadPlanTimeout();
   if (timeout_in_ms == 0)
     return;
@@ -88,13 +88,13 @@ void ThreadPlanSingleThreadTimeout::PushNewWithTimeout(Thread &thread,
 }
 
 void ThreadPlanSingleThreadTimeout::ResumeFromPrevState(Thread &thread,
-                                                        TimeoutInfo &info) {
+                                                        TimeoutInfoSP &info) {
   uint64_t timeout_in_ms = thread.GetSingleThreadPlanTimeout();
   if (timeout_in_ms == 0)
     return;
 
   // There is already an instance alive.
-  if (info.m_isAlive)
+  if (info->m_isAlive)
     return;
 
   // Do not create timeout if we are not stopping other threads.
@@ -118,7 +118,7 @@ bool ThreadPlanSingleThreadTimeout::WillStop() {
   LLDB_LOGF(log, "ThreadPlanSingleThreadTimeout::WillStop().");
 
   // Reset the state during stop.
-  m_info.m_last_state = State::WaitTimeout;
+  m_info->m_last_state = State::WaitTimeout;
   return true;
 }
 
@@ -128,7 +128,7 @@ void ThreadPlanSingleThreadTimeout::DidPop() {
     std::lock_guard<std::mutex> lock(m_mutex);
     LLDB_LOGF(log, "ThreadPlanSingleThreadTimeout::DidPop().");
     // Tell timer thread to exit.
-    m_info.m_isAlive = false;
+    m_info->m_isAlive = false;
   }
   m_wakeup_cv.notify_one();
   // Wait for timer thread to exit.
@@ -163,12 +163,12 @@ void ThreadPlanSingleThreadTimeout::TimeoutThreadFunc(
       " ms",
       timeout_in_ms);
   self->m_wakeup_cv.wait_for(lock, std::chrono::milliseconds(timeout_in_ms),
-                             [self] { return !self->m_info.m_isAlive; });
+                             [self] { return !self->m_info->m_isAlive; });
   LLDB_LOGF(log,
             "ThreadPlanSingleThreadTimeout::TimeoutThreadFunc() wake up with "
             "m_isAlive(%d).",
-            self->m_info.m_isAlive);
-  if (!self->m_info.m_isAlive)
+            self->m_info->m_isAlive);
+  if (!self->m_info->m_isAlive)
     return;
 
   self->HandleTimeout();