Uh oh!
There was an error while loading. Please reload this page.
[release/6.0] Fix Unix ARM64 RtlRestoreContext implementation - #59849
Merged
Conversation
The RtlRestoreContext sets SP before reading out PC from the context. That can lead to a corruption of the PC in the context if an async signal is delivered to the thread or the thread is interrupted by any other mean after the SP is set and before the value of PC is extracted from the context. This change fixes it by setting the SP after both PC and SP values are read from the context data structure.
jkotas
approved these changes
Oct 1, 2021
jeffschwMSFT
approved these changes
Oct 1, 2021
jeffschwMSFT
left a comment
Member
There was a problem hiding this comment.
Approved. Let's strive for a green CI and we should take for consideration in .NET 6.
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 freeto 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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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 #59831 to release/6.0
/cc @jkotas@janvorli
Customer Impact
Linux ARM64 reliability. Hard to diagnose crash (jump to a random IP read from overwritten memory) triggered by specific interleaving of exception thrown on one thread and GC suspension executing on a second thread.
The bug was tracked to a crash that is observed in dotnet/runtime CI in System.Text.Json tests every few days (#57198). There are likely other crashes caused by this bug.
Testing
Standard dotnet/runtime CI pass.
Risk
Minimal. One-liner fix. Code path is exercised on every exception thrown.