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The quorum_del_child() callback runs under the graph lock, so it is not allowed to drain. It is only called as the .bdrv_del_child() callback, which is only called in the bdrv_del_child() function, which also runs under the graph lock. The bdrv_del_child() function is called by qmp_x_blockdev_change(). A drained section was already introduced there by commit "block: move drain out of quorum_add_child()". This finally finishes moving out the drain to places that are not under the graph lock started in "block: move draining out of bdrv_change_aio_context() and mark GRAPH_RDLOCK". Signed-off-by: Fiona Ebner <f.ebner@proxmox.com> Message-ID: <20250530151125.955508-17-f.ebner@proxmox.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>