mono-rt error when running custom library


Trying to put together a Xplatform project with Xamarin utilising a 3rd party iOS library called GeoMoby_SDK. []

It's just a SDK that wraps up AFNetworking and utilises the following Frameworks:

Now, I've tried all the suggestions with similar problems on this site to no avail. What I've done so far:

  • Updated the Linkwith.cs to the following:
    [assembly: LinkWith ("libGeoMobySDK.a", LinkTarget.ArmV7 | LinkTarget.Simulator,ForceLoad = true, Frameworks = "CoreLocation CoreMotion Security SystemConfiguration CFNetwork")]

  • Increased all the trampoline values (I don't understand this part but I gave it a shot)

  • Rebuilt the linking project.

  • Number of other things I've forgotten now, sorry.

Below is the stacktrace, although the library is not open-source i do know that where it is failing (GM_Server checkRegistration) is where it spins off a server request using AFHTTPClient *httpClient and AFJSONRequestOperation *operation.

Any help would be greatly appreciated.

Native stacktrace:

mono-rt: 0 GuildiOS 0x003969dd mono_handle_native_sigsegv + 349

mono-rt: 1 GuildiOS 0x003c3dec mono_sigsegv_signal_handler + 188

mono-rt: 2 libsystem_platform.dylib 0x05e74deb _sigtramp + 43

mono-rt: 3 ??? 0xffffffff 0x0 + 4294967295

mono-rt: 4 libobjc.A.dylib 0x0598ee34 objc_storeStrong + 29

mono-rt: 5 GuildiOS 0x002dac1b -[GM_Server checkRegistration::] + 75

mono-rt: 6 GuildiOS 0x002d697a __35-[GM_SDK checkIfDeviceIsRegistered]_block_invoke + 106

mono-rt: 7 libdispatch.dylib 0x05bbd7f8 _dispatch_call_block_and_release + 15

mono-rt: 8 libdispatch.dylib 0x05bd24b0 _dispatch_client_callout + 14

mono-rt: 9 libdispatch.dylib 0x05bc0eeb _dispatch_root_queue_drain + 287

mono-rt: 10 libdispatch.dylib 0x05bc1137 _dispatch_worker_thread2 + 39

mono-rt: 11 libsystem_pthread.dylib 0x05f64dab _pthread_wqthread + 336

mono-rt: 12 libsystem_pthread.dylib 0x05f68cce start_wqthread + 30


Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries

used by your application.


  • Bump, could anyone point me in the right direction for understanding the following stack trace line?

    mono-rt: 3 ??? 0xffffffff 0x0 + 4294967295

    I really am not sure what is occurring here.

    This library works fine using Xcode.

  • Hi all, so we got ahold of Xamarin support and they provided a fix for us. It was centred around the 3rd party library and getting zombie NSStrings. (related bug here

    Fix + work around:

    "ideally the GeoMoby library will be updated to fix these retained NSStrings. In the mean time, you can sort-of workaround the problem by changing the ApiDefinition.cs file to use NSStrings directly in the binding rather than strings [2]."

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