Sentry: Android Native Application

SDKs
1

Hi,

I am trying to add Sentry Native Crash logging to the native portion of an Android Application. I.e. the c/c++ section that the Java Application communicates with across the JNI.

I have successfully been able to integrate the Java portion of Sentry and see crash logs and events on our project. That process was well documented and very simple.

However, I am having trouble with the sentry-native portion. I have downloaded and built the Android version of the sentry-native project using make android-build PREMAKE_DIR=gen_android. This has successfully built the libsentry_breakpad.so, libsentry_crashpad.so and libsentry.so files. I have tried linking both the libsentry.so and libsentry_breakpad.so libraries into my native C/C++ project and have successfully built the project with the following sample code:

    sentry_options_t *options = sentry_options_new();
    sentry_options_set_dsn(options, "https://XXXXX@sentry.io/XXXX");
    sentry_options_set_database_path(options, "sentry-db");
    sentry_init(options);

    sentry_value_t event = sentry_value_new_event();
    sentry_value_set_by_key(event, "message",
                            sentry_value_new_string("Hi Colin! -init"));
    sentry_capture_event(event);

    sentry_capture_event(sentry_value_new_message_event(SENTRY_LEVEL_INFO, "error", "Hi Colin"));

    sentry_shutdown();

The DSN Value that I am using is the same as on the Java side of the project. And I am seeing events get generated there.

I am never seeing any of the events on the Sentry Portal for the Native side.

I can’t see any logcat errors after the sentry_capture_event().

Does anyone have any advice on what is going wrong? Or where I should look next?

Thanks,

-Colin

2

Hi Colin. Thanks for giving a try to our native SDK with Android.
I wanted to mention we’re working on NDK support and planned alpha release is next week:

There’s a sample app in this repo that causes errors in C++ which is captured by the SDK.
Please note this is an alpha but we’re aiming to get the Beta (stable API) in a few weeks.

Would love feedback on that.

3

Hi Bruno,

Thank you for your help and direction. It is definitely helping.

I cloned the sentry-android project, updated the DSN in the AndroidManifest.xml, and built the sentry-sample project. I am seeing crash and event logs from the Java side on Sentry.io without any changes to the sentry-sample project. But nothing from the ‘Crash from Native (Segfault)’ OR ‘Capture Event From Native.’ I am running the sample on a piece of custom hardware running Android Marshmallow.

The first issue that I ran into was that the Native code didn’t have access to the context.getCacheDir() folder on my device. Changing it to context.getExternalCacheDir() fixed that issue.

The second issue that I am running into is a ‘Envelope header is missing required ‘event_id’’ message. If I set a break point in the native code right after the return of ‘sentry_envelope_write_to_file(envelope, outbox_path);’ on line 26 of sentry.c I am seeing some oddness.

  1. There appears to be an empty {} at the beginning.
  2. The contents of the envelope appears to be repeated a bunch of times.
  3. The envelope doesn’t appear to be terminated correctly. There is no trailing braces.

I don’t know if the “pre-alpha” stage of the project means that you guys aren’t ready of external input, but I thought I would throw it across the fence.

I have attached the contents here:

{}

{“event_id”:“b34bee69-8e77-4360-0496-5f7e44727587”,“length”:27498,“type”:“event”}
{“NDK verification event”:“The NDK integration works!”,“contexts”:{},“debug_meta”:{“images”:[{“code_file”:“io.sentry.sample”,“code_id”:“69ff07c28ab0e218ccd2e4db0a0bb344”,“debug_id”:“69ff07c2-8ab0-e218-ccd2-e4db0a0bb344”,“image_addr”:“0x7f87ca2000”,“image_size”:89168,“type”:“elf”},{“code_file”:"/system/lib64/libdirect-coredump.so",“code_id”:“2cf9d688b078cf8be2d66a771f0116fc”,“debug_id”:“2cf9d688-b078-cf8b-e2d6-6a771f0116fc”,“image_addr”:“0x7f87c27000”,“image_size”:69640,“type”:“elf”},{“code_file”:"/system/lib64/libcutils.so",“code_id”:“d0227f66942c2df82e774c56d79118f7”,“debug_id”:“d0227f66-942c-2df8-2e77-4c56d79118f7”,“image_addr”:“0x7f87bff000”,“image_size”:160832,“type”:“elf”},{“code_file”:"/system/lib64/libutils.so",“code_id”:“d015e121d3b86c8942f6de5585b69330”,“debug_id”:“d015e121-d3b8-6c89-42f6-de5585b69330”,“image_addr”:“0x7f87bc9000”,“image_size”:217224,“type”:“elf”},{“code_file”:"/system/lib64/liblog.so",“code_id”:“1f76{“NDK verification event”:“The NDK integration works!”,“contexts”:{},“debug_meta”:{“images”:[{“code_file”:“io.sentry.sample”,“code_id”:“69ff07c28ab0e218ccd2e4db0a0bb344”,“debug_id”:“69ff07c2-8ab0-e218-ccd2-e4db0a0bb344”,“image_addr”:“0x7f87ca2000”,“image_size”:89168,“type”:“elf”},{“code_file”:”/system/lib64/libdirect-coredump.so",“code_id”:“2cf9d688b078cf8be2d66a771f0116fc”,“debug_id”:“2cf9d688-b078-cf8b-e2d6-6a771f0116fc”,“image_addr”:“0x7f87c27000”,“image_size”:69640,“type”:“elf”},{“code_file”:"/system/lib64/libcutils.so",“code_id”:“d0227f66942c2df82e774c56d79118f7”,“debug_id”:“d0227f66-942c-2df8-2e77-4c56d79118f7”,“image_addr”:“0x7f87bff000”,“image_size”:160832,“type”:“elf”},{“code_file”:"/system/lib64/libutils.so",“code_id”:“d015e121d3b86c8942f6de5585b69330”,“debug_id”:“d015e121-d3b8-6c89-42f6-de5585b69330”,“image_addr”:“0x7f87bc9000”,“image_size”:217224,“type”:“elf”},{“code_file”:"/system/lib64/liblog.so",“code_id”:“1f764b27e1f082e3745261f49f219f7a”,“debug_id”:“1f764b27-e1f0-82e3-7452-61f49f219f7a”,“imag{“NDK verification 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event”:“The NDK integration 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4

Sorry I forgot to mention that stuff is on a separate branch. We’re working on it right now and it also requires a branch from sentry native.

We’ll be releasing a working solution by next week. Published to bintray so you can try it out.

5

Thanks Bruno,

I will put this effort on ice until our next sprint then.

Thanks,

-Colin

6

Hey Bruno,

I just updated to the ‘io.sentry:sentry-android:2.0.0-alpha07’ build and I am now able to track native events! Awesome! Thanks! Nice Work!

The stack trace is a bit limited though. Do you have suggestions about how to or where to upload native library symbols so that I can see a symbolicated stack trace?

Thanks,

-Colin

1 Like
7

I’ve spent some more time debugging why my symbols are not getting populated correctly from native crashes with the 2.0.0-alpha07 tag on an Android Marshmallow platform.

I think the issue is that the debug_id is not getting correctly updated from the code_id in the “Images Loaded” section of a crash event.

This image is from the crash event showing the Debug ID/ Code ID for the expected symbol library and is in the event panel.

event_debug_id
event_debug_id1069×181 20.3 KB

It is my understanding that the debug id for elf images is the little-endian UUID representation fo the first 16 bytes of the code_id identifier. The image makes it appear that the Debug ID is not getting updated correctly and results in a failed debug source lookup.

This following image shows the expected Debug ID from the Debug Files section of my project.

debug_symbol%20files
debug_symbol%20files1168×240 35.9 KB

This image shows the first 16 bytes flipped from the code_id.

This seems like it is an issue with the sentry native part of the chain that is uploading the module information.

Can someone more intimate with the sentry-native project verify my conclusions?

Thanks,

-Colin

8

Hey Colinp.
Thanks for raising this and sorry for the inconvinience.
We’ve tracked down that issue last Friday but failed to update sentry-android with the fix done on sentry-native.

Once this PR is merged; https://github.com/getsentry/sentry-android/pull/162 we’ll make a new release that will have this fix.

Once again thanks a lot for trying our alphas!!

9

Thanks Bruno! I appreciate you working on this feature!

-Colin

1 Like
10

We’ve released alpha8 on bintray and jcenter.
Cheers!

11

finally the Android SDK is GA, see at https://github.com/getsentry/sentry-android/releases/tag/2.0.0

please let us know if you find any issues, thanks for the help :slight_smile: