Fix taskMonitor leak when shim killed

[cardyok]

When shim process is unexpectedly killed, task.Delete might be invoked after metadata has been removed in onClose function and monitor.Stop will be skipped thus leading to taskMonitor data leak.

Fixes #6685

Signed-off-by: cardy.tang [email protected]

[k8s-ci-robot]

Hi @cardyok. Thanks for your PR.

I'm waiting for a containerd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[k8s-ci-robot]

PR needs rebase.

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[github-actions[bot]]

This PR is stale because it has been open 90 days with no activity. This PR will be closed in 7 days unless new comments are made or the stale label is removed.

[github-actions[bot]]

This PR was closed because it has been stalled for 7 days with no activity.