Android debug symbols not symbolicated when using Flutter flavors with --split-debug-info

[Kobby-Bawuah]

Environment

sentry_dart_plugin: 3.2.1 (latest)
sentry_flutter: 9.10.0 / 9.11.0
Flutter: 3.38.9 (stable)
Platform: Android (arm64)
Build type: appbundle with flavors

Steps to Reproduce

• Have a Flutter project with multiple Android flavors (e.g. googlePlay, appGallery)

• Build with flavors and --split-debug-info:
  flutter build appbundle --flavor=googlePlay --obfuscate --split-debug-info=debug_info/googlePlay --extra-gen-snapshot-options=--save-obfuscation-map=build/obfuscation.map.json

• Configure pubspec.yaml:
  sentry: symbols_path: debug_info upload_source_maps: true upload_sources: true dart_symbol_map_path: build/obfuscation.map.json

• Run dart run sentry_dart_plugin

• Trigger an error on Android and view the issue in Sentry

Expected Result

Android stack traces are symbolicated, with function names, file names, and line numbers visible — the same as iOS.

Actual Result

All Android stack frames show symbolicator_status: "missing_symbol". iOS events from the same project are symbolicated correctly.

Root cause: Debug ID mismatch between uploaded .symbols file and the libapp.so in the final APK.

The upload logs show the plugin uploads symbols from the wrong flavor:
UPLOADED edda1b4f-6d6f-b66d-128a-5ff367eac22c (merged_native_libs/googlePlayRelease/.../libapp.so; arm64 library)UPLOADED edda1b4f-6d6f-b66d-128a-5ff3d45a56ef (flutter/appGalleryRelease/arm64-v8a/app.so; arm64 library)

The debug companion (with DWARF info) is uploaded with the appGallery debug ID:
UPLOADED edda1b4f-6d6f-b66d-128a-5ff3d45a56ef (app.android-arm64.symbols; arm64 debug companion)

But the running app reports the googlePlay debug ID:
debug_id: "edda1b4f-6d6f-b66d-128a-5ff367eac22c"

In Sentry's Debug Files, searching for the event's debug ID shows only the stripped libapp.so (symtab + unwind, no debug). The debug companion with full DWARF info is associated with a different debug ID.

Key observations:

• Removing --flavor from the build command results in correct symbolication
• Cleaning the build environment (including debug_info/ and .dart_tool/) before building does not fix the issue
• The .dart_tool/flutter_build/ directory generates separate subdirectories for each flavor, and the plugin/CLI picks up artifacts from the wrong one
• iOS is unaffected because dSYM generation doesn't have this flavor interaction

#352 — "Missing debug symbols since updating to Flutter 3.32.8" (closed as not planned, same root cause)

[linear]

DARTPL-39

[Kobby-Bawuah]

ZD Ticket for more context: https://sentry.zendesk.com/agent/tickets/174070

[buenaflor]

I believe this issue has been introduced in 3.2.0.

I am investigating adding a flavor config

[buenaflor]

Is it possible to verify if this issue happens in 3.1.1 as well

[Maatteogekko]

Yes, still happens on 3.1.1. The issue id on our sentry dashboard is 7287857904.

These are the logs of the plugin:

[❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚] 0% reading config values..        
Searching for pubspec.yaml or sentry.properties config...

Found config from pubspec.yaml

Downloading Sentry CLI 2.41.1 from https://downloads.sentry-cdn.com/sentry-cli/2.41.1/sentry-cli-Darwin-universal to .dart_tool/pub/bin/sentry_dart_plugin/sentry-cli

Sentry CLI binary checksum verification passed successfully (hash: 4b6703bb6160accb7d3552128945357910ff273fde5d5a8aa4d1668958bb9472).

Sentry CLI downloaded successfully.
☑ reading config values                                                             
☑ validating config values                                                             
[❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚] 18% uploading debug symbols..                                
> Found 0 debug information files
> No debug information files found

> Found 146 debug information files (1 with embedded sources)

> Resolved source code for 4 debug information files

> Prepared debug information files for upload

> Uploaded 8 missing debug information files

> File upload complete:

  UPLOADED 3dede911-8a22-7e86-4ea9-e7ff1b341a00 (stripped_native_libs/googlePlayRelease/stripGooglePlayReleaseDebugSymbols/out/lib/armeabi-v7a/libapp.so; arm library)
  UPLOADED 00ce8f83-2087-944d-cc74-84da0b5fee03 (flutter/appGalleryRelease/x86_64/app.so; x86_64 library)
  UPLOADED 00ce8f83-2087-944d-cc74-84da126b5c81 (stripped_native_libs/googlePlayRelease/stripGooglePlayReleaseDebugSymbols/out/lib/x86_64/libapp.so; x86_64 library)
  UPLOADED 3dede911-8a22-7e86-4ea9-e7ff1b341a00 (merged_native_libs/googlePlayRelease/mergeGooglePlayReleaseNativeLibs/out/lib/armeabi-v7a/libapp.so; arm library)
  UPLOADED 00ce8f83-2087-944d-cc74-84da126b5c81 (merged_native_libs/googlePlayRelease/mergeGooglePlayReleaseNativeLibs/out/lib/x86_64/libapp.so; x86_64 library)
  UPLOADED 3dede911-8a22-7e86-4ea9-e7ffa26bc1dc (flutter/appGalleryRelease/armeabi-v7a/app.so; arm library)
  UPLOADED edda1b4f-8628-a867-128a-5ff3a435a626 (flutter/appGalleryRelease/arm64-v8a/app.so; arm64 library)
  UPLOADED edda1b4f-8628-a867-128a-5ff360b23c6d (stripped_native_libs/googlePlayRelease/stripGooglePlayReleaseDebugSymbols/out/lib/arm64-v8a/libapp.so; arm64 library)

> Found 1 debug information file

> Resolved source code for 1 debug information file

> Prepared debug information files for upload

> Uploaded 2 missing debug information files

> File upload complete:

  UPLOADED 00ce8f83-2087-944d-cc74-84da0b5fee03 (app.android-x64.symbols; x86_64 debug companion)
  UPLOADED 00ce8f83-2087-944d-cc74-84da0b5fee03 (app.android-x64.symbols; x86_64 sources)

> Found 1 debug information file

> Resolved source code for 1 debug information file

> Prepared debug information files for upload

> Uploaded 2 missing debug information files

> File upload complete:

  UPLOADED edda1b4f-8628-a867-128a-5ff3a435a626 (app.android-arm64.symbols; arm64 sources)
  UPLOADED edda1b4f-8628-a867-128a-5ff3a435a626 (app.android-arm64.symbols; arm64 debug companion)

> Found 1 debug information file

> Resolved source code for 1 debug information file

> Prepared debug information files for upload

> Uploaded 2 missing debug information files

> File upload complete:

  UPLOADED 3dede911-8a22-7e86-4ea9-e7ffa26bc1dc (app.android-arm.symbols; arm sources)
  UPLOADED 3dede911-8a22-7e86-4ea9-e7ffa26bc1dc (app.android-arm.symbols; arm debug companion)
☑ uploading debug symbols                                                             

Created release [redacted]@8.4.1+348
[❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚❚] 27% uploading source maps..                               
Web build directory "build/web" does not exist, skipping JS file enumeration.

Skipping source maps upload. Could not inject debug ids.
☑ uploading source maps                                                             

+---------------+--------------+
| Repository    | Revision     |
+---------------+--------------+
| [redacted] / App | b3766d018b3f |
+---------------+--------------+

Finalized release [redacted]@8.4.1+348