Fix current instance count on failure during component instantiation#13048
Merged
alexcrichton merged 1 commit intobytecodealliance:mainfrom Apr 13, 2026
Merged
Fix current instance count on failure during component instantiation#13048alexcrichton merged 1 commit intobytecodealliance:mainfrom
alexcrichton merged 1 commit intobytecodealliance:mainfrom
Conversation
fitzgen
approved these changes
Apr 10, 2026
github-actions
bot
added
fuzzing
Subscribe to Label Actioncc @fitzgen DetailsThis issue or pull request has been labeled: "fuzzing", "wasmtime:api"Thus the following users have been cc'd because of the following labels:
To subscribe or unsubscribe from this label, edit the |
alexcrichton
force-pushed
the
fix-decrement
branch
from
44e411a to
5666457
Compare
github-merge-queue
bot
removed this pull request from the merge queue due to failed status checks
This commit fixes an issue during component instantiation where if instantiation failed during creation of the `Instantiator` due to OOM or if the `async` future was dropped the concurrent instance count in the pooling allocator would get corrupted (off-by-one). The fix here is to switch a `map_err` with a manual decrement to using a value that has a destructor to ensure that it handles both of these cases.
alexcrichton
force-pushed
the
fix-decrement
branch
from
5666457 to
58b6325
Compare
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
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
This commit fixes an issue during component instantiation where if instantiation failed during creation of the
Instantiatordue to OOM or if theasyncfuture was dropped the concurrent instance count in the pooling allocator would get corrupted (off-by-one). The fix here is to switch amap_errwith a manual decrement to using a value that has adestructor to ensure that it handles both of these cases.