App crash: condition `xref_count == xref_index' not met

[MarcinPawlicaFS]

Hi Everyone, I've spent some time searching for similar issues, but couldn't find an answer, so I decided to write a post here.

In our MAUI app, when running on Android, after a couple of page changes (10-ish maybe), the app simply crashes. I managed to get some information from the Android device, and here are some interesting things I was able to find.

First of all, these are the last logs with my app's process id (have cut out other logs for clarity, can send the full thing if needed)

07-16 16:10:19.720 10340 23950 23950 I Quality : Skipped: false 2 cost 25.874643 refreshRate 11090483 bit true processName [my process name]
07-16 16:10:19.741 10340 23950 23950 W MaterialButton: MaterialButton manages its own background to control elevation, shape, color and states. Consider using backgroundTint, shapeAppearance and other attributes where available. A custom background will ignore these attributes and you should consider handling interaction states such as pressed, focused and disabled
07-16 16:10:19.853 10340 23950 23950 E scoringapp.maui: * Assertion at /__w/1/s/src/mono/mono/metadata/sgen-tarjan-bridge.c:1174, condition `xref_count == xref_index' not met, function:processing_build_callback_data, xref_count is 3374 but we added 3370 xrefs
07-16 16:10:19.853 10340 23950 23950 F libc    : Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 23950 (scoringapp.maui), pid 23950 (scoringapp.maui)

And here's some more details that I believe are also present in the tombstone file:

07-16 16:10:20.291 10340 28115 28115 F DEBUG   : Process name is [my process name], not key_process
07-16 16:10:20.291 10340 28115 28115 F DEBUG   : keyProcess: 0
07-16 16:10:20.291 10340 28115 28115 F DEBUG   : *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
07-16 16:10:20.291 10340 28115 28115 F DEBUG   : Build fingerprint: 'OPPO/CPH2197EEA/OP4F39L1:13/TP1A.220905.001/R.17f10c5_4-1:user/release-keys'
07-16 16:10:20.291 10340 28115 28115 F DEBUG   : Revision: '0'
07-16 16:10:20.291 10340 28115 28115 F DEBUG   : ABI: 'arm64'
07-16 16:10:20.291 10340 28115 28115 F DEBUG   : Timestamp: 2024-07-16 16:10:20.005851014+0200
07-16 16:10:20.291 10340 28115 28115 F DEBUG   : Process uptime: 289s
07-16 16:10:20.291 10340 28115 28115 F DEBUG   : Cmdline: [my process name]
07-16 16:10:20.291 10340 28115 28115 F DEBUG   : pid: 23950, tid: 23950, name: scoringapp.maui  >>> [my process name] <<<
07-16 16:10:20.291 10340 28115 28115 F DEBUG   : uid: 10340
07-16 16:10:20.291 10340 28115 28115 F DEBUG   : signal 6 (Power hint received), code -1 (SI_QUEUE), fault addr --------
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :     x0  0000000000000000  x1  0000000000005d8e  x2  0000000000000006  x3  0000007ff9ac06c0
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :     x4  6e6d6e6c2e627172  x5  6e6d6e6c2e627172  x6  6e6d6e6c2e627172  x7  7f7f7f7f7f7f7f7f
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :     x8  00000000000000f0  x9  000000760123be60  x10 0000000000000001  x11 00000076012a1a44
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :     x12 0000007ff9abf4c0  x13 00000000000000cd  x14 0000007ff9abf570  x15 0000000034155555
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :     x16 000000760130b8f0  x17 00000076012e5890  x18 0000007604a1c000  x19 0000000000005d8e
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :     x20 0000000000005d8e  x21 00000000ffffffff  x22 0000000000000000  x23 00000074cfdbc000
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :     x24 00000074cfdbc000  x25 00000074cfdc0000  x26 00000074858c85e8  x27 00000074cfdbcf10
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :     x28 0000000000000000  x29 0000007ff9ac0740
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :     lr  0000007601292a08  sp  0000007ff9ac06a0  pc  0000007601292a34  pst 0000000000001000
07-16 16:10:20.291 10340 28115 28115 F DEBUG   : backtrace:
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #00 pc 000000000007da34  /apex/com.android.runtime/lib64/bionic/libc.so (abort+168) (BuildId: 59222d1015276d9a9031ee1ea28c0bcd)
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #01 pc 000000000001f360  /data/app/~~PDqje7vSJ0P3o3mLx1G6mA==/[my process name]-4R-ULBZaw6ek1OTt-e6nEg==/lib/arm64/libmonodroid.so (xamarin::android::Helpers::abort_application()+8) (BuildId: 7feeaaea39e016c6c3bff7e94f0388b70b31f6ba)
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #02 pc 0000000000035660  /data/app/~~PDqje7vSJ0P3o3mLx1G6mA==/[my process name]-4R-ULBZaw6ek1OTt-e6nEg==/lib/arm64/libmonodroid.so (xamarin::android::internal::MonodroidRuntime::mono_log_handler(char const*, char const*, char const*, int, void*)+144) (BuildId: 7feeaaea39e016c6c3bff7e94f0388b70b31f6ba)
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #03 pc 00000000001d71e4  /data/app/~~PDqje7vSJ0P3o3mLx1G6mA==/[my process name]-4R-ULBZaw6ek1OTt-e6nEg==/lib/arm64/libmonosgen-2.0.so (BuildId: 0f098099f9864f5dd2f171de2c2842c264a97a1d)
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #04 pc 00000000001d7310  /data/app/~~PDqje7vSJ0P3o3mLx1G6mA==/[my process name]-4R-ULBZaw6ek1OTt-e6nEg==/lib/arm64/libmonosgen-2.0.so (BuildId: 0f098099f9864f5dd2f171de2c2842c264a97a1d)
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #05 pc 00000000002a3b10  /data/app/~~PDqje7vSJ0P3o3mLx1G6mA==/[my process name]-4R-ULBZaw6ek1OTt-e6nEg==/lib/arm64/libmonosgen-2.0.so (BuildId: 0f098099f9864f5dd2f171de2c2842c264a97a1d)
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #06 pc 000000000029ddf4  /data/app/~~PDqje7vSJ0P3o3mLx1G6mA==/[my process name]-4R-ULBZaw6ek1OTt-e6nEg==/lib/arm64/libmonosgen-2.0.so (BuildId: 0f098099f9864f5dd2f171de2c2842c264a97a1d)
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #07 pc 00000000002c544c  /data/app/~~PDqje7vSJ0P3o3mLx1G6mA==/[my process name]-4R-ULBZaw6ek1OTt-e6nEg==/lib/arm64/libmonosgen-2.0.so (BuildId: 0f098099f9864f5dd2f171de2c2842c264a97a1d)
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #08 pc 00000000002c24f8  /data/app/~~PDqje7vSJ0P3o3mLx1G6mA==/[my process name]-4R-ULBZaw6ek1OTt-e6nEg==/lib/arm64/libmonosgen-2.0.so (BuildId: 0f098099f9864f5dd2f171de2c2842c264a97a1d)
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #09 pc 00000000002c20ec  /data/app/~~PDqje7vSJ0P3o3mLx1G6mA==/[my process name]-4R-ULBZaw6ek1OTt-e6nEg==/lib/arm64/libmonosgen-2.0.so (BuildId: 0f098099f9864f5dd2f171de2c2842c264a97a1d)
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #10 pc 00000000002d1a78  /data/app/~~PDqje7vSJ0P3o3mLx1G6mA==/[my process name]-4R-ULBZaw6ek1OTt-e6nEg==/lib/arm64/libmonosgen-2.0.so (BuildId: 0f098099f9864f5dd2f171de2c2842c264a97a1d)
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #11 pc 00000000002be524  /data/app/~~PDqje7vSJ0P3o3mLx1G6mA==/[my process name]-4R-ULBZaw6ek1OTt-e6nEg==/lib/arm64/libmonosgen-2.0.so (BuildId: 0f098099f9864f5dd2f171de2c2842c264a97a1d)
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #12 pc 00000000002a7278  /data/app/~~PDqje7vSJ0P3o3mLx1G6mA==/[my process name]-4R-ULBZaw6ek1OTt-e6nEg==/lib/arm64/libmonosgen-2.0.so (BuildId: 0f098099f9864f5dd2f171de2c2842c264a97a1d)
07-16 16:10:20.291 10340 28115 28115 F DEBUG   :       #13 pc 000000000000be20  <anonymous:75ec386000>

Unfortunately I am unable to provide a small isolated project which shows the issue, haven't had enough luck to convince my boss that spending time on doing that is worthwhile... yet :)

When searching for possible solutions I stumbled upon suggestions to change the bridge-implementation to old or new, but those are rather old, and I was unable to find a way to make the MONO_GC_PARAMS thing in a file to work (no AndroidEnvironment build action in my VS). I also found a very short information, that the 'old' implementation is no longer supported since .NET 7 anyway.

We are using .NET 8, VS 2022 v17.10.2.

I would kindly ask for your help in finding the source of my issue.

[cgomezm]

Hey, did you find a solution for this. Having the same issue

[corradolab]

I got the same error with a net8.0-android application (which is what MAUI uses when targeting Android).
Fixed setting
MONO_GC_PARAMS=bridge-implementation=new
as described here

[burrowj]

Anyone know ho wi can set this in Net 9? The Buld action of AndroidEnvironment doesn't seem to be available

[burrowj]

For anyone else that gets here, putting
GC.Collect();
In the Page viewmodel releasing code fixed the issue for me. Maybe try putting this in page / viewmodel releasing code