panic in the TestSetAndGetOwnerOpValue

[hawkingrei]

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 --- FAIL: TestSetAndGetOwnerOpValue (36.00s)
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0x6a9f497]
goroutine 175 [running]:
testing.tRunner.func1.2({0x1ff2da0, 0x8fd01d0})
	GOROOT/src/testing/testing.go:1545 +0x238
testing.tRunner.func1()
	GOROOT/src/testing/testing.go:1548 +0x397
panic({0x1ff2da0?, 0x8fd01d0?})
	GOROOT/src/runtime/panic.go:914 +0x21f
github.com/pingcap/tidb/pkg/owner.(*ownerManager).SetOwnerOpValue(0xc0006fe960, {0x30f2c10, 0x9f0eec0}, 0x0)
	pkg/owner/manager.go:415 +0x897
github.com/pingcap/tidb/pkg/owner_test.TestSetAndGetOwnerOpValue(0xc0003556c0)
	pkg/owner/manager_test.go:158 +0x556
testing.tRunner(0xc0003556c0, 0x28c2dc8)
	GOROOT/src/testing/testing.go:1595 +0xff
created by testing.(*T).Run in goroutine 1
	GOROOT/src/testing/testing.go:1648 +0x3ad
-- 

https://tiprow.hawkingrei.com/view/gs/pingcapprow/logs/coverage/1744173198565445632#1:build-log.txt%3A12294

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