panic: time: Stop called on uninitialized Timer

goroutine 1820 [running]:
time.(*Timer).Stop(...)
	/usr/local/go/src/time/sleep.go:79
github.com/google/syzkaller/pkg/ipc.(*command).exec.func1()
	/syzkaller/gopath/src/github.com/google/syzkaller/pkg/ipc/ipc.go:802 +0xf5
created by github.com/google/syzkaller/pkg/ipc.(*command).exec in goroutine 37
	/syzkaller/gopath/src/github.com/google/syzkaller/pkg/ipc/ipc.go:795 +0x22b