On .NET 9, Java exception on background thread double reports

[bruno-garcia]

SDK version 5.9.0 (latest)

Originally, when we, added this method, it was only captured via the native Android SDK.
It seems at some point .NET started also capturing it.

But it's quite odd, because the one captured by .NET has no stack trace (so rather useless)
And the screenshot seems to be sometime after the native one (not sure how many frames)

Managed details

{"event_id":"287cd4d5a475427db838fd4c4c074015","project":5953206,"release":"io.sentry.symbolcollector.android@1.23.0+1","dist":"1","platform":"csharp","message":"","datetime":"2025-06-01T02:20:13+00:00","tags":[["build-type","release"],["device","Pixel 5"],["device.family","Pixel"],["environment","production"],["handled","no"],["level","error"],["mechanism","AppDomain.UnhandledException"],["os","Android 13"],["os.name","Android"],["os.rooted","no"],["runtime",".NET 9.0.4"],["runtime.name",".NET"],["dist","1"],["release","io.sentry.symbolcollector.android@1.23.0+1"],["user","id:40358816-2ec3-4509-8bf7-010aa72c21fa"],["server-endpoint","https://symbol-collector.services.sentry.io/"],["server_name","localhost"],["user-agent","Dalvik/2.1.0 (Linux; U; Android 13; Pixel 5 Build/TQ3A.230901.001)"]],"_dsc":{"environment":"production","public_key":"656e2e78d37d4511a4ea2cb3602e7a65","release":"io.sentry.symbolcollector.android@1.23.0+1","replay_id":null,"trace_id":"7271fcf62c6e47cfb7bc3e2bb3a17cd8","transaction":null},"_meta":{"extra":{"Metrics":{"FileOrDirectoryUnauthorizedAccessCount":{"":{"rem":[["@password:filter","x"]]}}}}},"_metrics":{"bytes.ingested.event":7272,"bytes.ingested.event.attachment":397321,"bytes.stored.event":8554,"bytes.stored.event.attachment":397321},"breadcrumbs":{"values":[{"timestamp":1748744412.191,"type":"default","category":"ui.event","level":"info","message":"OnUploadButtonOnClick"}]},"contexts":{"Current Culture":{"calendar":"GregorianCalendar","display_name":"English (United Kingdom)","name":"en-GB","type":"Current Culture"},"Dynamic Code":{"Compiled":true,"Supported":true,"type":"Dynamic Code"},"Memory Info":{"allocated_bytes":245368,"compacted":false,"concurrent":false,"finalization_pending_count":0,"high_memory_load_threshold_bytes":34501017,"pause_durations":[0,0],"total_available_memory_bytes":38334464,"type":"Memory Info"},"ThreadPool Info":{"available_completion_port_threads":1000,"available_worker_threads":32767,"max_completion_port_threads":1000,"max_worker_threads":32767,"min_completion_port_threads":1,"min_worker_threads":8,"type":"ThreadPool Info"},"app":{"app_start_time":"2025-06-01T02:20:04.6947513+00:00","type":"app"},"device":{"name":"Pixel 5","family":"Pixel","model":"Pixel 5","model_id":"TQ3A.230901.001","arch":"arm64-v8a","battery_level":100.0,"orientation":"portrait","manufacturer":"Google","brand":"google","screen_resolution":"1080x2138","screen_density":2.75,"screen_dpi":440,"charging":true,"low_memory":false,"simulator":false,"memory_size":7824052224,"free_memory":2477084672,"storage_size":117153181696,"free_storage":96139882496,"boot_time":"2025-06-01T00:24:37.6935833+00:00","timezone":"America/New_York","device_unique_identifier":"2c40764ae1214a5a9c846c95dd901a87","timezone_display_name":"(UTC-05:00) Eastern Time (New York)","type":"device"},"os":{"os":"Android 13","name":"Android","version":"13","build":"TQ3A.230901.001","kernel_version":"4.19.269-g8728c337137c-ab10161573","rooted":false,"type":"os"},"runtime":{"runtime":".NET 9.0.4","name":".NET","version":"9.0.4","raw_description":".NET 9.0.4","identifier":"android-arm64","type":"runtime"},"trace":{"trace_id":"7271fcf62c6e47cfb7bc3e2bb3a17cd8","span_id":"3dc1fbc1eba20a7d","status":"unknown","origin":"manual","type":"trace"},"uname":{"Machine":"aarch64","Nodename":"localhost","Release":"4.19.269-g8728c337137c-ab10161573","Sysname":"Linux","Version":"#1 SMP PREEMPT Thu May 18 11:19:41 UTC 2023","type":"uname"}},"culprit":"","environment":"production","exception":{"values":[{"type":"Java.Lang.RuntimeException","value":"This exception was caused deliberately by SentrySdk.CauseCrash(CrashType.JavaBackgroundThread).","module":"Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065","thread_id":11,"mechanism":{"type":"AppDomain.UnhandledException","description":"This exception was caught by the .NET Application Domain global error handler. 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The native one has a stack trace (the Java file name and line number)

Native

{"event_id":"0a22c79162a0406a9d497c047c7335e8","project":5953206,"release":"io.sentry.symbolcollector.android@1.23.0+1","dist":"1","platform":"java","message":"","datetime":"2025-06-01T02:20:13+00:00","tags":[["build-type","release"],["device","Pixel 5"],["device.class","2"],["device.family","Pixel"],["environment","production"],["handled","no"],["isSideLoaded","true"],["level","fatal"],["mechanism","UncaughtExceptionHandler"],["os","Android 13"],["os.name","Android"],["os.rooted","no"],["dist","1"],["release","io.sentry.symbolcollector.android@1.23.0+1"],["user","id:2c40764ae1214a5a9c846c95dd901a87"],["server-endpoint","https://symbol-collector.services.sentry.io/"],["user-agent","Dalvik/2.1.0 (Linux; U; Android 13; Pixel 5 Build/TQ3A.230901.001)"]],"_dsc":{"environment":"production","public_key":"656e2e78d37d4511a4ea2cb3602e7a65","release":"io.sentry.symbolcollector.android@1.23.0+1","replay_id":null,"sample_rand":"0.1005134502601192","trace_id":"3d1275b74c1c434ba7d8422f7a0c71aa","transaction":null},"_meta":{"extra":{"Metrics":{"":{"rem":[["@password:filter","s",0,10]],"len":420}}}},"_metrics":{"bytes.ingested.event":4522,"bytes.ingested.event.attachment":172661,"bytes.stored.event":6737,"bytes.stored.event.attachment":172661},"breadcrumbs":{"values":[{"timestamp":1748744405.692,"type":"navigation","category":"ui.lifecycle","level":"info","data":{"screen":"MainActivity","state":"created"}},{"timestamp":1748744406.365,"type":"navigation","category":"ui.lifecycle","level":"info","data":{"screen":"MainActivity","state":"started"}},{"timestamp":1748744406.367,"type":"navigation","category":"app.lifecycle","level":"info","data":{"state":"foreground"}},{"timestamp":1748744406.374,"type":"navigation","category":"ui.lifecycle","level":"info","data":{"screen":"MainActivity","state":"resumed"}},{"timestamp":1748744412.184,"type":"user","category":"ui.click","level":"info","data":{"view.class":"android.widget.Button","view.id":"btnUpload"}},{"timestamp":1748744412.191,"type":"default","category":"ui.event","level":"info","message":"OnUploadButtonOnClick"}]},"contexts":{"app":{"app_start_time":"2025-06-01T02:20:04.251Z","app_identifier":"io.sentry.symbolcollector.android","app_name":"Symbol 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SentrySdk.CauseCrash(CrashType.JavaBackgroundThread).","module":"java.lang","stacktrace":{"frames":[{"function":"run","module":"io.sentry.android.supplemental.Buggy$1","filename":"Buggy.java","abs_path":"Buggy.java","lineno":13,"in_app":false,"data":{"orig_in_app":-1,"category":"framework"}}]},"raw_stacktrace":{"frames":[{"function":"run","module":"io.sentry.android.supplemental.Buggy$1","filename":"Buggy.java","abs_path":"Buggy.java","lineno":13,"in_app":false,"data":{"orig_in_app":-1,"category":"framework"}}]},"thread_id":120,"mechanism":{"type":"UncaughtExceptionHandler","handled":false,"exception_id":0}}]},"extra":{"Metrics":"[Filtered]"},"fingerprint":["{{ default 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SentrySdk.CauseCrash(CrashType.JavaBackgroundThread).","type":"error","user":{"id":"2c40764ae1214a5a9c846c95dd901a87","ip_address":"66.85.52.52","sentry_user":"id:2c40764ae1214a5a9c846c95dd901a87","geo":{"country_code":"US","city":"Santa Clara","subdivision":"California","region":"United States"}},"version":"7"}

Ideally we'd stop .NET from trying to capture this.

[jpnurmi]

Reproducible with both CrashType.JavaThread and CrashType.JavaBackgroundThread, also with Sentry.Samples.Android (net8.0-android) and Sentry.Samples.Maui (net9.0-android35.0).