Obsfucated class `fel` leaks Activity's context

[kevinbojarski]

SPECIFIC ISSUE ENCOUNTERED

Memory leak detected by leak canary in arcore in solarsystem sample application (reproducible in other applications as well)

VERSIONS USED

• Android Studio: 3.5.3
• ARCore SDK for Android: 1.14
• Device manufacturer, model, and O/S: emulator
• ARCore: versionName=1.14.191118089 signatures=PackageSignatures{b259c69 [53bcc66f]}
• Output of adb shell getprop ro.build.fingerprint: google/sdk_gphone_x86/generic_x86:8.1.0/OSM1.180201.031/5455776:userdebug/dev-keys

STEPS TO REPRODUCE THE ISSUE

1. Add debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.0' dependency to solarsystem example
2. run application, and hit back button
3. memory leak detected by leak canary

ADDITIONAL COMMENTS

Memory leak detected by leak canary: 2019-12-16 16:32:35.810 5417-5586/com.google.ar.sceneform.samples.solarsystem D/LeakCanary: ==================================== HEAP ANALYSIS RESULT

1 APPLICATION LEAKS

References underlined with "~~~" are likely causes.
Learn more at https://squ.re/leaks.

154624 bytes retained
┬
├─ dalvik.system.PathClassLoader
│    Leaking: NO (Object[]↓ is not leaking and A ClassLoader is never leaking)
│    GC Root: Global variable in native code
│    ↓ PathClassLoader.runtimeInternalObjects
├─ java.lang.Object[]
│    Leaking: NO (fel↓ is not leaking)
│    ↓ array Object[].[246]
├─ fel
│    Leaking: NO (a class is never leaking)
│    ↓ static fel.a
│                 ~
├─ fel
│    Leaking: YES (fel wraps an Activity with Activity.mDestroyed true)
│    ↓ fel.mBase
╰→ com.google.ar.sceneform.samples.solarsystem.SolarActivity
​     Leaking: YES (fel↑ is leaking and Activity#mDestroyed is true and ObjectWatcher was watching this)
​     key = 45574c63-a377-493a-8a4f-8d577d46c4f2
​     watchDurationMillis = 5121
​     retainedDurationMillis = 120
====================================
0 LIBRARY LEAKS

Leaks coming from the Android Framework or Google libraries.
====================================
METADATA

Please include this in bug reports and Stack Overflow questions.

Build.VERSION.SDK_INT: 27
Build.MANUFACTURER: Google
LeakCanary version: 2.0
App process name: com.google.ar.sceneform.samples.solarsystem
Analysis duration: 2994 ms
Heap dump file path: /data/user/0/com.google.ar.sceneform.samples.solarsystem/files/leakcanary/2019-12-16_16-32-32_026.hprof
Heap dump timestamp: 1576531955809
====================================

[Sheng-Xuan]

Having the same issue, but in my case the obfuscated name is 'fby'

[triplesky]

Has anyone solved this problem？this appear in hell_ar_java ,helloscenform demo,in my case name is 'fsb' @devbridie

[devbridie]

The problem should be solved in latest ARCore versions. Please make sure your ARCore SDK version is recent. If you're still seeing this, let me know.