{"action":"created","comment":{"url":"https://api.github.com/repos/docker/docker/pulls/comments/28168969","id":28168969,"diff_hunk":"@@ -216,3 +216,39 @@ Here is the list of supported options:\n     Example use:\n \n     ``docker -d --storage-opt dm.blkdiscard=false``\n+\n+ *  `dm.override_udev_sync_check`\n+\n+    Overrides the `udev` synchronization checks between devicemapper and udev.\n+    `udev` is the device manager for the Linux kernel.\n+\n+    To view the `udev` sync support of a Docker daemon that is using the\n+    devicemapper driver, run:\n+\n+        $ docker info\n+\t[...]\n+\t Udev Sync Supported: true\n+\t[...]\n+\n+    When `udev` sync is supported, then devicemapper and udev can coordinate\n+    the activation and deactivation of devices for containers.\n+\n+    When `udev` sync is `false`, a race conditions occurs between\n+    the`devicemapper` and `udev` during create and cleanup. 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