Bug 40214 - System.InvalidProgramException: Invalid IL code in OnCreateViewHolder
Summary: System.InvalidProgramException: Invalid IL code in OnCreateViewHolder
Alias: None
Product: Android
Classification: Xamarin
Component: General ()
Version: 6.0.1 (C6SR1)
Hardware: PC Windows
: --- critical
Target Milestone: 6.1 (C7)
Assignee: Radek Doulik
Depends on:
Reported: 2016-04-07 18:14 UTC by Stadnik Piotr
Modified: 2016-04-14 20:02 UTC (History)
4 users (show)

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

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Description Stadnik Piotr 2016-04-07 18:14:22 UTC
# Steps to reproduce
I've created a dedicated repo with sample project to reproduce this bug here: 

Application starts w/o problems with v4.0.1.147 and thorws an error with v4.0.3.214

I'm using RecyclerView with custom RecyclerView.Adapter, and during run-time when I try to attach handler to my custom action an exception is thrown.

Custom adapter:

During runtime this in this line:
viewHolder.OnItemClick += HandleItemClick;

This exception is thrown:
System.InvalidProgramException: Invalid IL code in 

# Supplemental info (logs, images, videos)
04-07 17:48:09.515 D/OpenGLRenderer( 2146): Enabling debug mode 0
An unhandled exception occured.
04-07 17:48:12.591 D/Mono    ( 2146): DllImport attempting to load: '/system/lib/liblog.so'.
04-07 17:48:12.591 D/Mono    ( 2146): DllImport loaded library '/system/lib/liblog.so'.
04-07 17:48:12.591 D/Mono    ( 2146): DllImport searching in: '/system/lib/liblog.so' ('/system/lib/liblog.so').
04-07 17:48:12.591 D/Mono    ( 2146): Searching for '__android_log_print'.
04-07 17:48:12.591 D/Mono    ( 2146): Probing '__android_log_print'.
04-07 17:48:12.591 D/Mono    ( 2146): Found as '__android_log_print'.
04-07 17:48:12.591 I/MonoDroid( 2146): UNHANDLED EXCEPTION:
04-07 17:48:12.591 I/MonoDroid( 2146): System.InvalidProgramException: Invalid IL code in Xamarin.Sample.AbstractRecyclerAdapter`2<TKey_REF, TValue_REF>:OnCreateViewHolder (Android.Views.ViewGroup,int): IL_0040: stloc.2   
04-07 17:48:12.591 I/MonoDroid( 2146):   at Android.Support.V7.Widget.RecyclerView+Adapter.n_OnCreateViewHolder_Landroid_view_ViewGroup_I (IntPtr jnienv, IntPtr native__this, IntPtr native_parent, Int32 viewType) [0x00011] in <filename unknown>:0 
04-07 17:48:12.591 I/MonoDroid( 2146):   at (wrapper dynamic-method) System.Object:5c6e383e-022f-41cc-91ee-b783d994f5f4 (intptr,intptr,intptr,int)
04-07 17:48:12.595 I/dalvikvm( 2146): Could not find method java.lang.Throwable.<init>, referenced from method md52ce486a14f4bcd95899665e9d932190b.JavaProxyThrowable.<init>
04-07 17:48:12.595 W/dalvikvm( 2146): VFY: unable to resolve direct method 19226: Ljava/lang/Throwable;.<init> (Ljava/lang/String;Ljava/lang/Throwable;ZZ)V
04-07 17:48:12.595 D/dalvikvm( 2146): VFY: replacing opcode 0x70 at 0x0000
An unhandled exception occured.

# Test environment (full version information)
Visual Studio Enterprise 2015 Version 14.0.24720.00 Update 1
Windows 10 Enterprise
Comment 1 Rodrigo Kumpera 2016-04-11 22:55:34 UTC
Hey Radek,

Any news on this bug? Is it XA specific or a runtime/compiler issue?
Comment 2 Radek Doulik 2016-04-12 13:49:20 UTC
Piotr, could you please attach archive with content of the obj/ directory in your project?
Comment 3 Radek Doulik 2016-04-12 13:53:13 UTC
Rodrigo, looks like runtime/compiler issue to me. The XA linker adds only Newobj and Throw opcodes so far, so if the broken IL is the "IL_0040: stloc.2" then it might be compiler.

It will be clearer once we have the actual assembly.
Comment 4 Rodrigo Kumpera 2016-04-12 17:39:14 UTC
Ok, I'm CC'ing Marek on this one in case it's a mcs issue.
Comment 5 Marek Safar 2016-04-13 18:14:10 UTC
I cannot compile the project. Could you upload project with correct references or at least compiled bin/ folder output?
Comment 6 Stadnik Piotr 2016-04-13 18:31:23 UTC
Hi, I've just updated the hint path of references.
Comment 7 Marek Safar 2016-04-13 19:18:56 UTC
I cannot reproduce it using the latest alphas
Comment 8 Rustam Zaitov 2016-04-14 20:01:51 UTC
I verified this app with builds from C7 and I am not able to reproduce the issue.

Env info: https://gist.github.com/a5e233e2ab47e1348003007476f5163f