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Logs: entire log queue is dropped if a single log is bad #5186

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getsentry/sentry-javascript
#20245
Closed
Logs: entire log queue is dropped if a single log is bad#5186
getsentry/sentry-javascript
#20245
Assignees
antonis
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BugLogs

Description

@lucas-zimerman
lucas-zimerman
opened on Sep 22, 2025

What React Native libraries do you use?

Hermes

Are you using sentry.io or on-premise?

sentry.io (SaS)

@sentry/react-native SDK Version

latest

How does your development environment look like?

⬇  Place the `npx react-native@latest info` output here. ⬇

Sentry.init()

Sentry.init({
  dsn: 'https://...@sentry.io/...'
  // other options
});

Steps to Reproduce

I don't know why the broken log actually gets dropped, but it also drops the other healthy logs. We moved it to the logs project because it seems to be related to backend.

            for (let i = 0; i < 30; i++){
              Sentry.logger.info(`LOOP 5 healthy log 0 - ${i + 1}`);
            }
            Sentry.logger.error('lets break this (LVL 5)', {
              bad5: '{"a":"\uD800"}',
            });

Expected Result

40 logs with level 5

Actual Result

Image

Activity

  1. lucas-zimerman
    added
    Bug
    React-Native
    on Sep 22, 2025

  2. linear commented on Sep 22, 2025

    @linear
    linearBot
    on Sep 22, 2025 – with Linear

    RN-341 Logs: entire log queue is dropped if a single log is bad

  3. linear
    added
    Logs
    and removed
    React-Native
    on Sep 26, 2025

  4. lucas-zimerman commented on Oct 3, 2025

    @lucas-zimerman
    lucas-zimerman
    on Oct 3, 2025
    CollaboratorAuthor
    Image Image

    Happens with raw Javascript too.

    log was sent, spotlight only removed the problematic one whereas sentry removed all logs

    {"sdk":{"name":"sentry.javascript.angular","version":"10.17.0"}}
{"type":"log","item_count":31,"content_type":"application/vnd.sentry.items.log+json"}
{"items":[{"timestamp":1759503679.561,"level":"info","body":"LOOP 5 healthy log 0 - 1","trace_id":"bc1b813ce6eb46129103b95187482076","severity_number":9,"attributes":{"sentry.release":{"value":"1.0.0","type":"string"},"sentry.environment":{"value":"staging","type":"string"},"sentry.sdk.name":{"value":"sentry.javascript.angular","type":"string"},"sentry.sdk.version":{"value":"10.17.0","type":"string"},"sentry.replay_id":{"value":"46b8a133da424af59ee266ace7d26c31","type":"string"},"sentry._internal.replay_is_buffering":{"value":true,"type":"boolean"}}},{"timestamp":1759503679.561,"level":"info","body":"LOOP 5 healthy log 0 - 2","trace_id":"bc1b813ce6eb46129103b95187482076","severity_number":9,"attributes":{"sentry.release":{"value":"1.0.0","type":"string"},"sentry.environment":{"value":"staging","type":"string"},"sentry.sdk.name":{"value":"sentry.javascript.angular","type":"string"},"sentry.sdk.version":{"value":"10.17.0","type":"string"},"sentry.replay_id":{"value":"46b8a133da424af59ee266ace7d26c31","type":"string"},"sentry._internal.replay_is_buffering":{"value":true,"type":"boolean"}}},{"timestamp":1759503679.561,"level":"info","body":"LOOP 5 healthy log 0 - 3","trace_id":"bc1b813ce6eb46129103b95187482076","severity_number":9,"attributes":{"sentry.release":{"value":"1.0.0","type":"string"},"sentry.environment":{"value":"staging","type":"string"},"sentry.sdk.name":{"value":"sentry.javascript.angular","type":"string"},"sentry.sdk.version":{"value":"10.17.0","type":"string"},"sentry.replay_id":{"value":"46b8a133da424af59ee266ace7d26c31","type":"string"},"sentry._internal.replay_is_buffering":{"value":true,"type":"boolean"}}},{"timestamp":1759503679.561,"level":"info","body":"LOOP 5 healthy log 0 - 4","trace_id":"bc1b813ce6eb46129103b95187482076","severity_number":9,"attributes":{"sentry.release":{"value":"1.0.0","type":"string"},"sentry.environment":{"value":"staging","type":"string"},"sentry.sdk.name":{"value":"sentry.javascript.angular","type":"string"},"sentry.sdk.version":{"value":"10.17.0","type":"string"},"sentry.replay_id":{"value":"46b8a133da424af59ee266ace7d26c31","type":"string"},"sentry._internal.replay_is_buffering":{"value":true,"type":"boolean"}}},{"timestamp":1759503679.562,"level":"info","body":"LOOP 5 healthy log 0 - 5","trace_id":"bc1b813ce6eb46129103b95187482076","severity_number":9,"attributes":{"sentry.release":{"value":"1.0.0","type":"string"},"sentry.environment":{"value":"staging","type":"string"},"sentry.sdk.name":{"value":"sentry.javascript.angular","type":"string"},"sentry.sdk.version":{"value":"10.17.0","type":"string"},"sentry.replay_id":{"value":"46b8a133da424af59ee266ace7d26c31","type":"string"},"sentry._internal.replay_is_buffering":{"value":true,"type":"boolean"}}},{"timestamp":1759503679.562,"level":"info","body":"LOOP 5 healthy log 0 - 6","trace_id":"bc1b813ce6eb46129103b95187482076","severity_number":9,"attributes":{"sentry.release":{"value":"1.0.0","type":"string"},"sentry.environment":{"value":"staging","type":"string"},"sentry.sdk.name":{"value":"sentry.javascript.angular","type":"string"},"sentry.sdk.version":{"value":"10.17.0","type":"string"},"sentry.replay_id":{"value":"46b8a133da424af59ee266ace7d26c31","type":"string"},"sentry._internal.replay_is_buffering":{"value":true,"type":"boolean"}}},{"timestamp":1759503679.562,"level":"info","body":"LOOP 5 healthy log 0 - 7","trace_id":"bc1b813ce6eb46129103b95187482076","severity_number":9,"attributes":{"sentry.release":{"value":"1.0.0","type":"string"},"sentry.environment":{"value":"staging","type":"string"},"sentry.sdk.name":{"value":"sentry.javascript.angular","type":"string"},"sentry.sdk.version":{"value":"10.17.0","type":"string"},"sentry.replay_id":{"value":"46b8a133da424af59ee266ace7d26c31","type":"string"},"sentry._internal.replay_is_buffering":{"value":true,"type":"boolean"}}},{"timestamp":1759503679.562,"level":"info","body":"LOOP 5 healthy log 0 - 8","trace_id":"bc1b813ce6eb46129103b95187482076","severity_number":9,"attributes":{"sentry.release":{"value":"1.0.0","type":"string"},"sentry.environment":{"value":"staging","type":"string"},"sentry.sdk.name":{"value":"sentry.javascript.angular","type":"string"},"sentry.sdk.version":{"value":"10.17.0","type":"string"},"sentry.replay_id":{"value":"46b8a133da424af59ee266ace7d26c31","type":"string"},"sentry._internal.replay_is_buffering":{"value":true,"type":"boolean"}}},{"timestamp":1759503679.562,"level":"info","body":"LOOP 5 healthy log 0 - 9","trace_id":"bc1b813ce6eb46129103b95187482076","severity_number":9,"attributes":{"sentry.release":{"value":"1.0.0","type":"string"},"sentry.environment":{"value":"staging","type":"string"},"sentry.sdk.name":{"value":"sentry.javascript.angular","type":"string"},"sentry.sdk.version":{"value":"10.17.0","type":"string"},"sentry.replay_id":{"value":"46b8a133da424af59ee266ace7d26c31","type":"string"},"sentry._internal.replay_is_buffering":{"value":true,"type":"boolean"}}},{"timestamp":1759503679.562,"level":"info","body":"LOOP 5 healthy log 0 - 10","trace_id":"bc1b813ce6eb46129103b95187482076","severity_number":9,"attributes":{"sentry.release":{"value":"1.0.0","type":"string"},"sentry.environment":{"value":"staging","type":"string"},"sentry.sdk.name":{"value":"sentry.javascript.angular","type":"string"},"sentry.sdk.version":{"value":"10.17.0","type":"string"},"sentry.replay_id":{"value":"46b8a133da424af59ee266ace7d26c31","type":"string"},"sentry._internal.replay_is_buffering":{"value":true,"type":"boolean"}}},{"timestamp":1759503679.562,"level":"info","body":"LOOP 5 healthy log 0 - 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29","trace_id":"bc1b813ce6eb46129103b95187482076","severity_number":9,"attributes":{"sentry.release":{"value":"1.0.0","type":"string"},"sentry.environment":{"value":"staging","type":"string"},"sentry.sdk.name":{"value":"sentry.javascript.angular","type":"string"},"sentry.sdk.version":{"value":"10.17.0","type":"string"},"sentry.replay_id":{"value":"46b8a133da424af59ee266ace7d26c31","type":"string"},"sentry._internal.replay_is_buffering":{"value":true,"type":"boolean"}}},{"timestamp":1759503679.563,"level":"info","body":"LOOP 5 healthy log 0 - 30","trace_id":"bc1b813ce6eb46129103b95187482076","severity_number":9,"attributes":{"sentry.release":{"value":"1.0.0","type":"string"},"sentry.environment":{"value":"staging","type":"string"},"sentry.sdk.name":{"value":"sentry.javascript.angular","type":"string"},"sentry.sdk.version":{"value":"10.17.0","type":"string"},"sentry.replay_id":{"value":"46b8a133da424af59ee266ace7d26c31","type":"string"},"sentry._internal.replay_is_buffering":{"value":true,"type":"boolean"}}},{"timestamp":1759503679.563,"level":"error","body":"lets break this (LVL 5)","trace_id":"bc1b813ce6eb46129103b95187482076","severity_number":17,"attributes":{"bad5":{"value":"{\"a\":\"\ud800\"}","type":"string"},"sentry.release":{"value":"1.0.0","type":"string"},"sentry.environment":{"value":"staging","type":"string"},"sentry.sdk.name":{"value":"sentry.javascript.angular","type":"string"},"sentry.sdk.version":{"value":"10.17.0","type":"string"},"sentry.replay_id":{"value":"46b8a133da424af59ee266ace7d26c31","type":"string"},"sentry._internal.replay_is_buffering":{"value":true,"type":"boolean"}}}]}
  5. AbhiPrasad
    self-assigned this
    on Oct 20, 2025

  6. AbhiPrasad commented on Oct 20, 2025

    @AbhiPrasad
    AbhiPrasad
    on Oct 20, 2025
    Contributor

    Assigning myself so I can investigate further.

  7. antonis
    unassigned
    AbhiPrasad
    on Apr 7, 2026

  8. antonis commented on Apr 13, 2026

    @antonis
    antonis
    on Apr 13, 2026
    Contributor

    Investigated whether this affects other Sentry SDKs. Here's a summary:

    Root cause is in Relay — expand_log_container in relay-server/src/processing/logs/process.rs parses the entire {"items": [...]} log container with serde_json in one shot. Any invalid Unicode in any item (like an unpaired surrogate \uD800) causes the whole batch to be rejected with DiscardReason::InvalidJson. This affects all SDKs.

    Cross-SDK vulnerability:

    SDK Per-Item Error Handling Surrogate-Safe Encoding Risk
    sentry-javascript / sentry-react-native No No (JSON.stringify preserves surrogates) High
    sentry-dotnet No No (Utf8JsonWriter throws on unpaired surrogates in .NET 8+) High
    sentry-java No Partial (Gson writes surrogates through without throwing, but Relay rejects) Medium
    sentry-dart Yes (try/catch at add-time) No explicit sanitization Medium
    sentry-python No per-item fallback Yes (json.dumps escapes surrogates to ASCII by default) Low
    sentry-cocoa Yes (try/catch at add-time) N/A (Swift String can't represent unpaired surrogates) Low

    Two-layer fix would be ideal:

    1. Relay: Parse log items individually so one bad item doesn't drop the batch
    2. SDKs: Sanitize strings before JSON serialization and/or add per-item try/catch during batch encoding
  9. antonis
    added a commit that references this issue on Apr 13, 2026

    fix(core): Sanitize lone surrogates in log body and attributes

    afbd06e
  10. antonis
    self-assigned this
    on Apr 13, 2026

  11. antonis commented on Apr 13, 2026

    @antonis
    antonis
    on Apr 13, 2026
    Contributor

    Opened getsentry/sentry-javascript#20245 to handle the SDK side (2) of the fix

  12. antonis
    added 5 commits that reference this issue on Apr 13, 2026

    fix(core): Sanitize lone surrogates in log body and attributes

    8e38c23

    fix(core): Sanitize lone surrogates in log body and attributes

    70ca92f

    fix(logs): Recover log containers with lone Unicode surrogates

    22b98ad

    fix(core): Sanitize lone surrogates in log body and attributes

    1274120

    fix(logs): Recover log containers with lone Unicode surrogates

    568b972
  13. Lms24
    added a commit that references this issue on May 20, 2026

    fix(core): Sanitize lone surrogates in log body and attributes (#20245)

    2069779
  14. Lms24
    closed this as completedin sentry-javascript#20245on May 20, 2026
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