fix(di): dynamic function discovery fallback [backport 2.21] #13998
+41
−3
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
![github-actions[bot]](https://avatars.githubusercontent.com/in/15368?s=60&v=4){kind=small}
We implement a dynamic function discovery fallback when the function-from-code resolution via the GC fails. This can happen if the target application has interacted with the GC, e.g. by freezing it at a time that will prevent the current discovery from being able to resolve the function from the referenced code object. ## Testing Strategy The original issue was reproducible with a local deployment of [synapse](https://github.com/element-hq/synapse). The investigation led to the conclusion that the issue was caused by the way the application interacts with the GC https://github.com/element-hq/synapse/blob/1dc29563c1504a2523e467aa7bef6a7ac05cc60c/synapse/app/_base.py#L623C1-L629C35. Commenting out these lines makes the issue disappear. We have tested the fix against the unmodified application to verify that the proposed fix works. Refs: [DYNIS-28](https://datadoghq.atlassian.net/browse/DYNIS-28) ## Checklist - [x] PR author has checked that all the criteria below are met - The PR description includes an overview of the change - The PR description articulates the motivation for the change - The change includes tests OR the PR description describes a testing strategy - The PR description notes risks associated with the change, if any - Newly-added code is easy to change - The change follows the [library release note guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html) - The change includes or references documentation updates if necessary - Backport labels are set (if [applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)) ## Reviewer Checklist - [x] Reviewer has checked that all the criteria below are met - Title is accurate - All changes are related to the pull request's stated goal - Avoids breaking [API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces) changes - Testing strategy adequately addresses listed risks - Newly-added code is easy to change - Release note makes sense to a user of the library - If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment - Backport labels are set in a manner that is consistent with the [release branch maintenance policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting) [DYNIS-28]: https://datadoghq.atlassian.net/browse/DYNIS-28?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ (cherry picked from commit b55f08f)
github-actions
bot
added
the
Dynamic Instrumentation
P403n1x87
approved these changes
Jul 15, 2025
|
|
tylfin
approved these changes
Jul 15, 2025
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Backport b55f08f from #13947 to 2.21.
We implement a dynamic function discovery fallback when the function-from-code resolution via the GC fails. This can happen if the target application has interacted with the GC, e.g. by freezing it at a time that will prevent the current discovery from being able to resolve the function from the referenced code object.
Testing Strategy
The original issue was reproducible with a local deployment of synapse. The investigation led to the conclusion that the issue was caused by the way the application interacts with the GC https://github.com/element-hq/synapse/blob/1dc29563c1504a2523e467aa7bef6a7ac05cc60c/synapse/app/_base.py#L623C1-L629C35. Commenting out these lines makes the issue disappear. We have tested the fix against the unmodified application to verify that the proposed fix works.
Refs: DYNIS-28
Checklist
Reviewer Checklist