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I have an app that is loading a large number of pictures from the photo gallery using ALAssetsLibrary API. Initially, it was crashing with a large number of images. I increased a number of trampolines to 4096 with the args:
-aot "nrgctx-trampolines=4096" -aot "nimt-trampolines=4096" -aot "ntrampolines=4096"
Yet, I am still seeing occasional crashes on a library of about 1000 images. Any suggestions? I want the app to be able to handle an unlimited number of images in the library. I can't go one raising the number of trampolines forever.
0 Focus 0x0012b69a testflight_backtrace
1 Focus 0x0012acfe TFSignalHandler
2 libsystem_platform.dylib 0x3a2e8722 _sigtramp
3 Focus 0x0016b7fb MonoTouch_ObjCRuntime_Trampolines_SDALAssetsLibraryAssetForURLResultDelegate_Invoke_intptr_intptr
4 Focus 0x0016b7fb MonoTouch_ObjCRuntime_Trampolines_SDALAssetsLibraryAssetForURLResultDelegate_Invoke_intptr_intptr
5 Focus 0x0018456b wrapper_native_to_managed_MonoTouch_ObjCRuntime_Trampolines_SDALAssetsLibraryAssetForURLResultDelegate_Invoke_intptr_intptr
6 AssetsLibrary 0x2f13583e __56-[ALAssetsLibrary assetForURL:resultBlock:failureBlock:]_block_invoke_2
7 libdispatch.dylib 0x3a1bb102 _dispatch_call_block_and_release
8 libdispatch.dylib 0x3a1bb0ee _dispatch_client_callout
9 libdispatch.dylib 0x3a1bd9a8 _dispatch_main_queue_callback_4CF
10 CoreFoundation 0x2f9a75b8 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__
11 CoreFoundation 0x2f9a5e84 __CFRunLoopRun
12 CoreFoundation 0x2f910540 CFRunLoopRunSpecific
13 CoreFoundation 0x2f910322 CFRunLoopRunInMode
14 GraphicsServices 0x346472ea GSEventRunModal
15 UIKit 0x321c71e4 UIApplicationMain
16 Focus 0x001839ff wrapper_managed_to_native_MonoTouch_UIKit_UIApplication_UIApplicationMain_int_string___intptr_intptr
17 Focus 0x00157917 MonoTouch_UIKit_UIApplication_Main_string___string_string
18 Focus 0x00131daf Focus.Application:Main in xdb.il on Line 1
19 Focus 0x0023b57f wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr
20 Focus 0x002da740 mono_jit_runtime_invoke in mini.c on Line 6504
21 Focus 0x0032211c mono_runtime_invoke in object.c on Line 2827
22 Focus 0x00325eac mono_runtime_exec_main in object.c on Line 4054
23 Focus 0x00325cec mono_runtime_run_main in object.c on Line 3678
24 Focus 0x002c4ad8 mono_jit_exec in driver.g.c on Line 962
25 Focus 0x0036ba03 main in main.m on Line 486
26 libdyld.dylib 0x3a1cfab6 start
-aot "nrgctx-trampolines=4096" -aot "nimt-trampolines=4096" -aot
^ those parameters are not used in recent version of Xamarin.iOS. The number of trampolines are automatically adjusted.
Can you give us a test case (we can supply the images but we need to see your code) ?
Also tell us on about the software version you're using* and the iOS version(s) and devices you used.
* The easiest way to get exact version information is to use the "Xamarin Studio" menu, "About Xamarin Studio" item, "Show Details" button and copy/paste the version informations (you can use the "Copy Information" button).
Nonetheless, before I plugged those parameters, my app was crashing immediately once ran on a phone with about 1000 images. Now, it's only crashing sometimes.
I will work on separating the code around ALAssetsLibrary. I will submit the code in a few days.
And here's the snippet from About Xamarin Studio:
=== Xamarin Studio ===
Version 4.2.2 (build 2)
Installation UUID: 06dba93e-1d37-4acf-90bb-a7f681abc781
Mono 3.2.5 ((no/964e8f0)
GTK+ 2.24.20 theme: Raleigh
Package version: 302050000
=== Xamarin.Android ===
=== Apple Developer Tools ===
Xcode 5.0.2 (3335.32)
=== Xamarin.iOS ===
Version: 188.8.131.52 (Indie Edition)
Build date: 2013-11-11 16:04:00-0500
=== Xamarin.Mac ===
Xamarin.Mac: Not Installed
=== Build Information ===
Release ID: 402020002
Git revision: c5f82958ae7d9af652b44b87ceff777b3ad19b91
Build date: 2013-11-19 15:35:40+0000
Xamarin addins: a4044fee09138f6fd031a9944b7caaeb51e57e80
=== Operating System ===
Mac OS X 10.9.0
Darwin MMs-MacBook-Pro.local 13.0.0 Darwin Kernel Version 13.0.0
Thu Sep 19 22:22:27 PDT 2013
Here's the test case as requested https://github.com/asednev/iOS-ImagePicker
What do I need to do to reproduce the crash? I ran the test project on an iPad Air and tapped/ticked all the images shown - is there anything else I need to do?
You need to have 1000+ images on the device. At that point the app will crash without you doing anything. I didn't try iPad Air but the app did crash every single time on on iPhone 4, iPhone 5, and iPhone 5S.
1900 images on an iPad Air did not crash.
I'll try on an older device and see if that changes anything.
4259 images on an iPhone 5 didn't crash either (both of these devices have iOS 7.1 installed).
Can you try profiling with Instruments to see if it's a memory problem? Are you getting memory warnings before the app crashes? It could also be useful to view a crash report from Xcode's Organizer.
Rolf, thank you for your suggestions. I will keep analyzing this issue. I will let you know what I find out. I didn't see crash reports on this issue in a few weeks. I wonder if it could have been an update to Xamarin.iOS that fixed it.
One more thing to clarify - when you ran the app on a phone with 1900 images (or 4259), did you try to actually scroll through these images?
No, I did not try scrolling much.
We have not received the requested information. If you are still experiencing this issue please provide all the requested information and re-open the bug report. Thanks!