Droid con bugsense
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The document discusses findings from analyzing crash data from over 40 million crashes reported by 320 million Android devices between March and May 2012. Key findings include: - Memory exhaustion and race conditions/deadlocks accounted for over half of all crashes. - Most crashes (86%) occurred in app context rather than Android or API context. - Ten Android APIs accounted for 17% of crashes. The most risky were setContentView, dismiss, inflate, and startActivity. - Common root cause exceptions were NullPointer, OutOfMemoryError, and IllegalArgumentException.
Droid con bugsense
- 1. ISTLab java.lang.RuntimeException: Unable to resume activity {com.pinapps.android/ java.lang.RuntimeException: Unable to start activity com.facebook.LoginActivity}: com.facebook.FacebookException: Cannot call LoginActivity ComponentInfo{com.pinapps.android/com.pinapps.android.ActAppDetails}: with a null calling package. This can occur if the launchMode of the caller is singleInstance. java.lang.NullPointerException at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2138) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100) at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2153) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1682) at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3553) at android.app.ActivityThread.access$1500(ActivityThread.java:117) at android.app.ActivityThread.access$700(ActivityThread.java:140) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1233) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:130) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:3701) at android.app.ActivityThread.main(ActivityThread.java:4898) at java.lang.reflect.Method.invokeNative(Native Method) What BigData tell us about at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 1008) at dalvik.system.NativeStart.main(Native Method) Caused by: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775) com.facebook.FacebookException: Cannot call LoginActivity with a null calling package. at dalvik.system.NativeStart.main(Native Method) Caused by: This can occur if the launchMode of the caller is singleInstance. java.lang.NullPointerException at com.facebook.LoginActivity.onResume(LoginActivity.java:110) Android Errors at com.pinapps.android.FragAppMedia.onCreateView(FragAppMedia.java:126) at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1176) at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460) at android.app.Activity.performResume(Activity.java:3882) at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2128) ... 12 more ... 12 more java.lang.RuntimeException: Unable to start activity java.lang.RuntimeException: Unable to start activity ComponentInfo{com.pinapps.android/ ComponentInfo{com.pinapps.android/com.pinapps.android.ActSplash}: com.pinapps.android.ActAppDetails}: java.lang.IllegalStateException: ViewPager does not android.view.InflateException: Binary XML file line #2: Error inflating class have adapter instance. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1670) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1686) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) at android.app.ActivityThread.access$1500(ActivityThread.java:118) at android.app.ActivityThread.access$600(ActivityThread.java:130) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:932) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:130) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:3706) at android.app.ActivityThread.main(ActivityThread.java:4745) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 841) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) at dalvik.system.NativeStart.main(Native Method) Caused by: at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.IllegalStateException: ViewPager does not have adapter instance. android.view.InflateException: Binary XML file line #2: Error inflating class at com.viewpagerindicator.TitlePageIndicator.setViewPager(TitlePageIndicator.java:716) at android.view.LayoutInflater.createView(LayoutInflater.java:518) at com.pinapps.android.ActAppDetails.onCreate(ActAppDetails.java:129) at at android.app.Activity.performCreate(Activity.java:5008) com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInfl at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) ater.java:56) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:568) ... 11 more What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 1 Monday, April 8, 13
- 2. ISTLab ISTLab I’m Panos Papadopoulos Founder & CEO at BugSense @panosjee I’m Maria Kechagia PhD student at AUEB Researcher at ISTLab What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 2 Monday, April 8, 13
- 3. You are here because of ANDROID BUGS Monday, April 8, 13
- 4. ISTLab ISTLab BigData Research 40M crashes 3M stack traces 320M devices From Mar 1 to May 30 2012 What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 4 Monday, April 8, 13
- 5. ISTLab ISTLab Crashing apps lead to user churn Total Users Affected Users Lost Users What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 5 Monday, April 8, 13
- 6. ISTLab ISTLab The Process Android Java Stack Data Cleaning Data Heuristics Apps Traces API Crash Suggestions Design Causes Categorization Signatures Problems 6 What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 6 Monday, April 8, 13
- 7. ISTLab ISTLab Heuristic Function (﴾F+ (﴾A+ I∗)﴿∗)﴿ | (﴾F∗ (﴾A+ I∗)﴿+)﴿E This expresses various scenarios in which an exception can occur Within the Android framework: F + E Within the application: F ∗ A+ E When the application calls an api: F∗ A+ I+ E Within an api-‐registered application callback: F∗ (﴾A+ I+ A+)﴿+ E When an api-‐registered application callback calls an api: F∗ (﴾A+ I+)﴿+ E What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 7 Monday, April 8, 13
- 8. ISTLab ISTLab API Minefield What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 8 Monday, April 8, 13
- 9. ISTLab ISTLab Crash Categories Memory Exhaustion 28 Rece conditions and deadlocks 28 Missing/Corrupted Resource 14 Unclassified 10 Invalid format/syntax 5 Indexing problem 5 Connectivity Problems 4 Improper component identification 3 Insufficient Permission 3 0 7.5 15 22.5 30 What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 9 Monday, April 8, 13
- 10. ISTLab ISTLab You are not to blame for all crashes! 86% app context 3% Android context 11% API context What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 10 Monday, April 8, 13
- 11. ISTLab ISTLab Memory Exhaustion java.lang.outofmemory java.lang.outofmemory 37% Although after Honeycomb bitmaps are stored into the Dalvik heap, such exceptions continue to puzzle developers. as mobile devices become smaller and applications have heavier graphics, there is a need for thrifty memory use and good performance. Use static memory with extreme care Study LruCache, SparseArray and Pair Rethink the use of Array & Collection What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 11 Monday, April 8, 13
- 12. ISTLab ISTLab Race Conditions & Deadlocks android.database.sqlite.SQLiteOpenHelper.getReadableDatabase android.os.AsyncTask.execute java.util.concurrent.RejectedExcutionException 28% A lot of problems arise around the SQLite and the AsyncTask classes, as they require extra attention concerning multithreading errors. Migitate the number of events processed by the main thread Use Java’s non-‐locking primitives and higher level concurrency abstractions. What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 12 Monday, April 8, 13
- 13. ISTLab ISTLab Missing/Corrupted Resources org.jaudiotagger.audio.exceptions.InvalidAudioFrameException 14% The system fails to locate or open an external file. Note that, here, we refer to external resources, such as an image or an audio file, and not application components.. Use try/catch blocks Use static analysis tools like Motorola Dev checker What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 13 Monday, April 8, 13
- 14. ISTLab ISTLab Improper Component Identification android.content.ActivityNotFoundException A lot of applications crash due to either undeclared 3% application components (﴾i.e. activities, services, broadcast receivers, or content providers)﴿, in the AndroidManifest.xml file, or system failure to detect a suitable component for a specific task. Malicious apps can try to launch an activity in order to exploit the permissions of the running app. Check the existence of the necessary application components What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 14 Monday, April 8, 13
- 15. ISTLab ISTLab Insufficient Permission android.app.Activity.startActivity java.lang.SecurityException This case can be probably caused by a missing or insufficient 3% permission for the particular activity, in the AndroidManifest.xls file. Also, there is the possibility for more than one entries to exist (﴾with different properties)﴿, for this activity, in the AndroidManifest.xls file. The system manager, however, allows unique activities characterized by a unique id. Check the permissions related to a component, before calling it to start. What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 15 Monday, April 8, 13
- 16. ISTLab ISTLab Top 10 Root cause Exceptions java.lang.NullPointerException 29 java.lang.outOfMemoryError 14 java.lang.IllegalArgumentException 7 java.lang.RuntimeException 5 java.lang.IllegalStateException 4 android.view.WindowManager$BadTokenException 3 android.database.sqlite.SQLiteException 3 java.lang.IndexOutOfBoundsException 2 java.lang.ArrayIndexOutOfBoundsException 2 java.io.FileNotFoundException 2 0 7.5 15 22.5 30 What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 16 Monday, April 8, 13
- 17. 10 api calls result in 17% of the crashes Monday, April 8, 13
- 18. ISTLab ISTLab Most Risky Android APIs android.app.Activity.setContentView 4 android.app.Dialog.dismiss 2 android.view.LayoutInflater.inflate 2 android.app.Activity.startActivity 1 android.graphics.BitmapFactory.decodeResource 1 android.app.Dialog.show 1 com.android.internal.view.BaseSurfaceHolder.unlockCanvasAndPost 1 android.graphics.Bitmap.createBItmap 1 java.util.ArrayList.get 1 android.view.LayoutInflater.inflate 1 0 1 2 3 4 What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 18 Monday, April 8, 13
- 19. ISTLab ISTLab #DROIDCON #LIVE #BUGSENSE http://www.bugsense.com/live One of the first 10 attendees to tweet wins a mastiha liquor! What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 19 Monday, April 8, 13
- 20. ISTLab ISTLab Questions? BugSense helps you analyze & troubleshoot your mobile applications in minutes http://www.bugsense.com What BigData Analysis tell us about Android Errors @ DroidCon DE, 11 April 2013 20 Monday, April 8, 13