----------------------------------------------------------------------
PANIC: snapstate_test.go:7198: snapmgrTestSuite.TestInstallWithoutCoreTwoSnapsWithFailureRunThrough
... Panic: sync: unlock of unlocked mutex (PC=0x45DE4E)
/usr/lib/go-1.6/src/runtime/panic.go:443
in gopanic
/usr/lib/go-1.6/src/sync/mutex.go:109
in Mutex.Unlock
/home/john/canonical/snappy/src/github.com/snapcore/snapd/overlord/state/state.go:148
in State.unlock
/home/john/canonical/snappy/src/github.com/snapcore/snapd/overlord/state/state.go:222
in State.Unlock
/usr/lib/go-1.6/src/runtime/panic.go:443
in gopanic
snapstate_test.go:77
in snapmgrTestSuite.settle
snapstate_test.go:7239
in snapmgrTestSuite.TestInstallWithoutCoreTwoSnapsWithFailureRunThrough
/usr/lib/go-1.6/src/reflect/value.go:303
in Value.Call
/usr/lib/go-1.6/src/runtime/asm_amd64.s:1998
in goexit