Bug 47607 - Not able to run the app on x86_64 Android devices after adding a package dependency with x86_64 library
Summary: Not able to run the app on x86_64 Android devices after adding a package depe...
Alias: None
Product: Android
Classification: Xamarin
Component: Linker ()
Version: 7.0 (C8)
Hardware: PC Mac OS
: --- normal
Target Milestone: ---
Assignee: Radek Doulik
Depends on:
Reported: 2016-11-21 23:05 UTC by Evgeny
Modified: 2017-10-17 02:19 UTC (History)
10 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Evgeny 2016-11-21 23:05:37 UTC
Steps to reproduce:
1) Create an Android project that does not have x86_64 in the list of enabled architectures.
2) Link project to a package that has an Android library with an x86_64 build. SQLitePCLRaw is one example.
3) Build the app and try to run it on a x86_64 device or simulator.

App crashes on startup with the following output
java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/<package>-1/base.apk"],nativeLibraryDirectories=[/data/app/<package>-1/lib/x86_64, /data/app/<package>-1/base.apk!/lib/x86_64, /vendor/lib64, /system/lib64]]] couldn't find "libmonodroid.so"
	at java.lang.Runtime.loadLibrary(Runtime.java:367)
	at java.lang.System.loadLibrary(System.java:1076)
	at mono.MonoPackageManager.LoadApplication(MonoPackageManager.java:34)
	at mono.MonoRuntimeProvider.attachInfo(MonoRuntimeProvider.java:22)
	at android.app.ActivityThread.installProvider(ActivityThread.java:5341)
	at android.app.ActivityThread.installContentProviders(ActivityThread.java:4936)
	at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4876)
	at android.app.ActivityThread.access$1700(ActivityThread.java:156)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1471)
	at android.os.Handler.dispatchMessage(Handler.java:102)
	at android.os.Looper.loop(Looper.java:148)
	at android.app.ActivityThread.main(ActivityThread.java:5608)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:746)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)

It looks like the app is built incorrectly in this case. I can see that the APK file has libs/x86_64 folder with a single file libe_sqlite3.so in it. This probably makes package manager believe that app has x86_64 build even though x86_64 architecture is un-checked in the project settings.

Expected result:
The APK file should not contain libs/x86_64 folder unless it is enabled in the project settings.

Enable x86_64 architecture in the project settings. This increases the APK size but fixes the problem.
Comment 1 Evgeny 2016-11-21 23:11:46 UTC
Strangely, this is limited to x86_64 architecture, but not arm64-v8a
Comment 2 Jahmai 2017-03-20 07:33:33 UTC
I have this problem with Xamarin.Android 7.1, did you ever resolve it? We need to manually pack the APK in order to fix it.
Comment 3 Chris Riesgo 2017-05-04 12:59:26 UTC
I'm seeing this issue too, but in the 15.2 Beta Preview 2. Please help. Because of another open issue, the workaround listed above (Enabling x86_64 architecture) cannot work. 

Here's a link to the other issue that compounds my problem with this one:

Comment 4 Christophe Oosterlynck 2017-07-03 12:30:56 UTC
We are having the same issue. Is there a fix planned for this?
Comment 5 John Miller [MSFT] 2017-07-05 17:25:25 UTC
Thank you for taking the time to submit the bug. We are unable to reproduce this issue. Please attach a reproduction to the bug by starting with a clean Xamarin.Android project and adding just the code necessary to demonstrate the issue.

Please also attach your version information to confirm which version of Xamarin.Android is being used. Thanks!
Comment 6 Christophe Oosterlynck 2017-07-07 11:21:42 UTC
Xamarin.Android version

I haven't had time yet to setup a demo project or test it on a more recent version of Xamarin.Android but I think I did find the source of the problem: 


"x86/library.so" and "x86_64/library.so" both contain the string "x86". So when compiling for x86 but not for x86_64, still both libraries are being put in the apk

Resulting lib folder in the APK:

Comment 7 Jahmai 2017-07-19 00:31:18 UTC
Can someone change the status of this bug? It looks like the problem has been identified and just needs a fix.

This issue is bloating our app due to needing to include x86_64 unnecessarily to work around it, otherwise the app crashes on x86_64 devices.
Comment 8 Jahmai 2017-08-11 01:55:37 UTC
Anyone?... Please update the status of this issue from NEEDINFO to something else.
Comment 9 Nathan Westfall 2017-08-30 17:43:15 UTC
Please see this follow pull request.  It contains a fix and test project.  I was testing using a x86_64 device.
Comment 10 Nathan Westfall 2017-08-30 17:43:24 UTC
Sorry, forgot the link. https://github.com/xamarin/xamarin-android/pull/796
Comment 11 Nathan Westfall 2017-09-01 19:30:20 UTC
Pull request was merged into master and confirmed using nightly build that this fixes the problem.
Comment 12 tomas_nemec 2017-10-15 08:10:09 UTC
I am having the same issue with VS for Mac 7.2 and Xamarin Android 8.0.33 when trying to build my MonoGame application.

When I select armeabi v7 + x86 as my release architectures (leaving x86_64 unselected) and then generate the APK the resulting file contains wrong dlls:


Has the fix in develop not got into or is there another place where the bug needs to be fixed?
Comment 13 Nathan Westfall 2017-10-17 02:19:08 UTC
I can confirm this went out in the Visual Studio 2017 15.5 Preview 1.  I actually just did a build today with this change using it.

You must be using Xamarin Android 8.1

If you don't want VS Preview, just pull Xamarin Android 8.1 from here