When the last output is disconnected, output_disable is called like usual and evacuates the output to the root->saved_workspaces list. It then calls root_for_each_container to remove (untrack) the output from each container's outputs list. However root_for_each_container did not iterate the saved workspaces, so when the output gets freed the containers would have a dangling pointer in their outputs list. Upon reconnect, container_discover_outputs would attempt to use the dangling pointer, causing a crash. This makes root_for_each_container check the saved workspaces list, which fixes the problem.master
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