Don't dispose channel when completing SshCommand #1596
Merged
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
The new(-ish) implementation of SshCommand has a race condition for short-lived commands where SSH_MSG_CHANNEL_CLOSE may be processed on the message loop thread before SSH_MSG_CHANNEL_SUCCESS is waited upon on the Execute (main) thread. This manifests in an ArgumentNull/NullReference exception on the wait handle because the channel has already been closed and disposed. Fix this by only delaying the channel dispose until the command dispose.
Rob-Hague
force-pushed
the
commandchannel
branch
from
4f008d3 to
17c3015
Compare
Rob-Hague
requested review from
drieseng and
WojciechNagorski
as code owners
WojciechNagorski
approved these changes
Feb 19, 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Outdated suggestions cannot be applied.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.
The new(-ish) implementation of SshCommand has a race condition for short-lived commands where SSH_MSG_CHANNEL_CLOSE may be processed on the message loop thread before SSH_MSG_CHANNEL_SUCCESS is waited upon on the Execute (main) thread. This manifests in an ArgumentNull/NullReference exception on the wait handle because the channel has already been closed and disposed.
Fix this by delaying the channel dispose until the command dispose.
I wrote a test for this but it depended too much on implementation for my liking. The fix has been verified per #1557 (comment)
fixes #1557