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CONTAP-178540: Controller disruption when updating CIFS share ACL

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ontap-9
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NAS
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Issue

When updating security on a CIFS share ACL, ONTAP traverses existing connections, looking for uses of the modified share so that the security change will take immediate effect. Due to a defect in ONTAP, this can result in controller instability, with a message like "thread hung for 4001 milliseconds".

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