avoid log channel closed caused endless loop

[wenjun93]

if log watcher meets error and closes logCh, log monitor will enter endless for loop

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[k8s-ci-robot]

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[wenjun93]

/assign @dchen1107

[andyxning]

/ok-to-test

[Random-Liu]

We should add more information in the log.

I'll send another change to address this. I want to fix something else anyway.

[Random-Liu]

@wenjun93 Thanks for the fix!

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[Random-Liu]

/lgtm
/approve

[Random-Liu]

@wenjun93 Can you sign CLA?

[Random-Liu]

@wangzhen127 we may want to cherrypick this into release-6.0 branch

[Random-Liu]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Random-Liu, wenjun93

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