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Fix Agent crash because of parallel access between kTaskFlowStatsColl…
…ector and kTaskDBExclude When kTaskFlowStatsCollector was updating stats in VnUveEntry, kTaskDBExclude went ahead and deleted the VnUveEntry. There are other such structures for which parallel access between kTaskFlowStatsCollector and kTaskDBExclude can cause issues Fixed all parallel access between kTaskFlowStatsCollector and kTaskDBExclude by acquiring required locks. Also added task exclusion between kTaskDBExclude and Agent::Uve to prevent simultaneous access of UVE data-structures between kTaskDBExclude and Agent::Uve. The code executed under kTaskDBExclude was earlier executed in db::DBTable which had exclusion with Agent::Uve. Also added locks to prevent simultaneous access between kTaskFlowStatsCollector and Agent::Uve. Closes-Bug: #1569645 Change-Id: I416799a823abe187a32b0bdf4c04ac5996a8144b
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