Balancer interfering with moveChunk in shard5.js

Mon Sep 24 23:33:46 uncaught exception: command {

	"movechunk" : "test.foo",

	"find" : {

		"num" : 3

	},

	"to" : "localhost:30000"

} failed: {

	"cause" : {

		"who" : {

			"_id" : "test.foo",

			"process" : "bs-mm1.local:30001:1348544026:1391051266",

			"state" : 1,

			"ts" : ObjectId("5061261a2e1bffcddee18cc9"),

			"when" : ISODate("2012-09-25T03:33:46.287Z"),

			"who" : "bs-mm1.local:30001:1348544026:1391051266:conn7:1553470752",

			"why" : "migrate-{ num: MinKey }"

		},

		"errmsg" : "the collection metadata could not be locked with lock migrate-{ num: MinKey }",

		"ok" : 0

	},

	"ok" : 0,

	"errmsg" : "move failed"

}