Various mono crashes - mono_string_new_size, mono_array_new_specific, etc

Hey guys

We are seeing a lot of crashes, and the crash dumps call stack all point to similar methods. So far, we've got 18 crashes from our testers with 4 call stack elements recuring:

mono_string_new_size
mono_array_new_specific
mono_gc_collect
mono_object_clone

These do not appear at the top of the call stack, but one of them is always visible in the call stack when the crash occurs and I can't really make sense of much else.. (Even with a development build)

For example

Spoiler: mono_gc_collect

Code (CSharp):

1. [Top of call stack]
2. at libmono.002b2c0c(Native Method)
3.     at libmono.GC_push_all_stack(GC_push_all_stack:72)
4.     at libmono.002bb91c(Native Method)
5.     at libmono.002bb9ec(Native Method)
6.     at libmono.002b7760(Native Method)
7.     at libmono.002b4754(Native Method)
8.     at libmono.002b1048(Native Method)
9.     at libmono.002ab11c(Native Method)
10.     at libmono.002aac00(Native Method)
11.     at libmono.002ab9c4(Native Method)
12.     at libmono.002aba64(Native Method)
13.     at libmono.mono_gc_collect(mono_gc_collect:40) ←
14.     at libunity.002b473c(Native Method)
15.     at libunity.00311a6c(Native Method)
16.     at libunity.00310fbc(Native Method)
17. [...etc]

or +

Spoiler: mono_object_clone

Code (CSharp):

1. [Top of call stack]
2. at libmono.002b2c0c(Native Method)
3.     at libmono.GC_push_all_stack(GC_push_all_stack:72)
4.     at libmono.002bb91c(Native Method)
5.     at libmono.002bb9ec(Native Method)
6.     at libmono.002b7760(Native Method)
7.     at libmono.002b4754(Native Method)
8.     at libmono.002b1048(Native Method)
9.     at libmono.002ab11c(Native Method)
10.     at libmono.002aac00(Native Method)
11.     at libmono.002ac2ac(Native Method)
12.     at libmono.002ac67c(Native Method)
13.     at libmono.002aff9c(Native Method)
14.     at libmono.002b0140(Native Method)
15.     at libmono.002b0528(Native Method)
16.     at libmono.001f5714(Native Method)
17.     at libmono.mono_object_clone(mono_object_clone:56) ←
18.     at libmono.0017ab24(Native Method)
19.     at Unknown.00013014(Unknown Source)
20.     at Object.MemberwiseClone(Native Method)
21.     at Delegate.Clone(<0x0001c>:28)
22.     at MulticastDelegate.CombineImpl(<0x001ab>:427)
23. [...etc]

 

I also meet this problem. I collect many crash reports about this from hundreds of android devices.

 

We just started using IL2CPP. Mono was completely unusable for us. IL2CPP works great but you have to make sure you do not use LoadAsync functionality because it causes crashes. (A fix is hopefully coming soon).

 

I thought IL2CPP was still experimental on android. The mono crashes you're seeing appear to be possibly running out of memory. Have you tried to lower the memory usage of your scenes/code to check whether the crashes occur less frequently?
BTW we have a rare crash (not locally reproducible) that occurs on what we suspect to be during LoadAsync using Unity 5.1.2p3 Mono on Android.

 

Well our game runs fine in IL2CPP (though there is a lot of crashes on devices with Mali gpus) so if memory was a problem it'd crash either way.