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d79295d89b
The target patch fixes a rare race condition which happen when a MUX IO handler is working on a connection already moved into the purge list. In this case, the handler will incorrectly moved back the connection into the idle list. To fix this, conn_delete_from_tree() was extended to remove flags along with the connection from the idle list. This was performed when the connection is moved into the purge list. However, it introduces another issue related to the idle server connection accounting. Thus it is necessary to revert it prior to the incoming newer fix. This patch must be backported to every version where the original commit is.