Ensure stale event does not cause ANR
Does a stale key event cause 'no focused window' ANR? It shouldn't, but
it wasn't already covered by tests.
Adding a test for that here to explicitly check the behaviour.
Bug: 219401047
Test: atest inputflinger_tests:InputDispatcherSingleWindowAnr
Change-Id: I0b1e33a7e705a4b968e3159bd15c70f00eda0191
(cherry picked from commit 673ce1e6dd1b18a293afacd6fc4e549a2e904f63)
diff --git a/services/inputflinger/dispatcher/InputDispatcher.cpp b/services/inputflinger/dispatcher/InputDispatcher.cpp
index bfdd22c..06ad6a8 100644
--- a/services/inputflinger/dispatcher/InputDispatcher.cpp
+++ b/services/inputflinger/dispatcher/InputDispatcher.cpp
@@ -160,10 +160,7 @@
// when an application takes too long to respond and the user has pressed an app switch key.
constexpr nsecs_t APP_SWITCH_TIMEOUT = 500 * 1000000LL; // 0.5sec
-// Amount of time to allow for an event to be dispatched (measured since its eventTime)
-// before considering it stale and dropping it.
-const nsecs_t STALE_EVENT_TIMEOUT = 10000 * 1000000LL // 10sec
- * HwTimeoutMultiplier();
+const std::chrono::duration STALE_EVENT_TIMEOUT = std::chrono::seconds(10) * HwTimeoutMultiplier();
// Log a warning when an event takes longer than this to process, even if an ANR does not occur.
constexpr nsecs_t SLOW_EVENT_PROCESSING_WARNING_TIMEOUT = 2000 * 1000000LL; // 2sec
@@ -364,10 +361,6 @@
first->applicationInfo.token == second->applicationInfo.token;
}
-bool isStaleEvent(nsecs_t currentTime, const EventEntry& entry) {
- return currentTime - entry.eventTime >= STALE_EVENT_TIMEOUT;
-}
-
std::unique_ptr<DispatchEntry> createDispatchEntry(const InputTarget& inputTarget,
std::shared_ptr<EventEntry> eventEntry,
int32_t inputTargetFlags) {
@@ -568,6 +561,10 @@
// --- InputDispatcher ---
InputDispatcher::InputDispatcher(const sp<InputDispatcherPolicyInterface>& policy)
+ : InputDispatcher(policy, STALE_EVENT_TIMEOUT) {}
+
+InputDispatcher::InputDispatcher(const sp<InputDispatcherPolicyInterface>& policy,
+ std::chrono::nanoseconds staleEventTimeout)
: mPolicy(policy),
mPendingEvent(nullptr),
mLastDropReason(DropReason::NOT_DROPPED),
@@ -586,6 +583,7 @@
mMaximumObscuringOpacityForTouch(1.0f),
mFocusedDisplayId(ADISPLAY_ID_DEFAULT),
mWindowTokenWithPointerCapture(nullptr),
+ mStaleEventTimeout(staleEventTimeout),
mLatencyAggregator(),
mLatencyTracker(&mLatencyAggregator) {
mLooper = new Looper(false);
@@ -943,6 +941,10 @@
}
}
+bool InputDispatcher::isStaleEvent(nsecs_t currentTime, const EventEntry& entry) {
+ return std::chrono::nanoseconds(currentTime - entry.eventTime) >= mStaleEventTimeout;
+}
+
/**
* Return true if the events preceding this incoming motion event should be dropped
* Return false otherwise (the default behaviour)
diff --git a/services/inputflinger/dispatcher/InputDispatcher.h b/services/inputflinger/dispatcher/InputDispatcher.h
index d3e171a..3c79c98 100644
--- a/services/inputflinger/dispatcher/InputDispatcher.h
+++ b/services/inputflinger/dispatcher/InputDispatcher.h
@@ -84,6 +84,8 @@
static constexpr bool kDefaultInTouchMode = true;
explicit InputDispatcher(const sp<InputDispatcherPolicyInterface>& policy);
+ explicit InputDispatcher(const sp<InputDispatcherPolicyInterface>& policy,
+ std::chrono::nanoseconds staleEventTimeout);
~InputDispatcher() override;
void dump(std::string& dump) override;
@@ -471,6 +473,11 @@
*/
std::optional<nsecs_t> mNoFocusedWindowTimeoutTime GUARDED_BY(mLock);
+ // Amount of time to allow for an event to be dispatched (measured since its eventTime)
+ // before considering it stale and dropping it.
+ const std::chrono::nanoseconds mStaleEventTimeout;
+ bool isStaleEvent(nsecs_t currentTime, const EventEntry& entry);
+
bool shouldPruneInboundQueueLocked(const MotionEntry& motionEntry) REQUIRES(mLock);
/**
diff --git a/services/inputflinger/tests/InputDispatcher_test.cpp b/services/inputflinger/tests/InputDispatcher_test.cpp
index 470d2f6..9633932 100644
--- a/services/inputflinger/tests/InputDispatcher_test.cpp
+++ b/services/inputflinger/tests/InputDispatcher_test.cpp
@@ -65,6 +65,8 @@
// An arbitrary pid of the gesture monitor window
static constexpr int32_t MONITOR_PID = 2001;
+static constexpr std::chrono::duration STALE_EVENT_TIMEOUT = 1000ms;
+
struct PointF {
float x;
float y;
@@ -489,7 +491,7 @@
void SetUp() override {
mFakePolicy = new FakeInputDispatcherPolicy();
- mDispatcher = std::make_unique<InputDispatcher>(mFakePolicy);
+ mDispatcher = std::make_unique<InputDispatcher>(mFakePolicy, STALE_EVENT_TIMEOUT);
mDispatcher->setInputDispatchMode(/*enabled*/ true, /*frozen*/ false);
// Start InputDispatcher thread
ASSERT_EQ(OK, mDispatcher->start());
@@ -4451,6 +4453,38 @@
ASSERT_TRUE(mDispatcher->waitForIdle());
}
+/**
+ * Make sure the stale key is dropped before causing an ANR. So even if there's no focused window,
+ * there will not be an ANR.
+ */
+TEST_F(InputDispatcherSingleWindowAnr, StaleKeyEventDoesNotAnr) {
+ mWindow->setFocusable(false);
+ mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {mWindow}}});
+ mWindow->consumeFocusEvent(false);
+
+ KeyEvent event;
+ const nsecs_t eventTime = systemTime(SYSTEM_TIME_MONOTONIC) -
+ std::chrono::nanoseconds(STALE_EVENT_TIMEOUT).count();
+
+ // Define a valid key down event that is stale (too old).
+ event.initialize(InputEvent::nextId(), DEVICE_ID, AINPUT_SOURCE_KEYBOARD, ADISPLAY_ID_NONE,
+ INVALID_HMAC, AKEY_EVENT_ACTION_DOWN, /* flags */ 0, AKEYCODE_A, KEY_A,
+ AMETA_NONE, 1 /*repeatCount*/, eventTime, eventTime);
+
+ const int32_t policyFlags = POLICY_FLAG_FILTERED | POLICY_FLAG_PASS_TO_USER;
+
+ InputEventInjectionResult result =
+ mDispatcher->injectInputEvent(&event, INJECTOR_PID, INJECTOR_UID,
+ InputEventInjectionSync::WAIT_FOR_RESULT,
+ INJECT_EVENT_TIMEOUT, policyFlags);
+ ASSERT_EQ(InputEventInjectionResult::FAILED, result)
+ << "Injection should fail because the event is stale";
+
+ ASSERT_TRUE(mDispatcher->waitForIdle());
+ mFakePolicy->assertNotifyAnrWasNotCalled();
+ mWindow->assertNoEvents();
+}
+
// We have a focused application, but no focused window
// Make sure that we don't notify policy twice about the same ANR.
TEST_F(InputDispatcherSingleWindowAnr, NoFocusedWindow_DoesNotSendDuplicateAnr) {