[release/10.0] [mono][interp] Disable inlining of methods that always throw#122594
Merged
jeffhandley merged 1 commit intorelease/10.0from Jan 8, 2026
Merged
[release/10.0] [mono][interp] Disable inlining of methods that always throw#122594jeffhandley merged 1 commit intorelease/10.0from
jeffhandley merged 1 commit intorelease/10.0from
Conversation
When inlining, we create a placeholder exit_bb that is branched to whenever the inlined method returns. When this bblock was not reachable, it was leading to some inconsistent CFG state. This is relatively easy to fix but, if exit_bb is dead, it means that the method is always throwing an exception. We shouldn't bother inlining such methods in the first place, since they are not part of hot code paths.
github-actions
bot
requested review from
BrzVlad,
kotlarmilos,
steveisok and
vitek-karas
as code owners
BrzVlad
approved these changes
Dec 16, 2025
BrzVlad
added
Servicing-consider
Contributor
|
Tagging subscribers to this area: @BrzVlad, @kotlarmilos |
BrzVlad
added
Servicing-approved
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 subscribe to this conversation on GitHub.
Already have an account?
Sign in.
3 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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
Backport of #122587 to release/10.0
/cc @BrzVlad
Customer Impact
Customer reported that app on blazor wasm hangs. Compiling methods that call throw helper methods (methods that always throw) with mono interpreter can lead to hangs in the runtime. MAUI ios can also be impacted in theory.
Regression
This a regression from .NET9. Seems like the issue started happening after #108731.
Testing
Verified with sample repro provided by customer.
Risk
Low. The fix aborts inlining in methods that throw unconditionally. The common mechanism of inline abort is reused so there is no added risk here.