lgo kernel occasionally die when it's interrupted

[yunabe]

F0227 22:36:51.068979   18784 gojupyterscaffold.go:181] Failed to echo heartbeat request: interrupted system call
goroutine 7 [running]:
github.com/golang/glog.stacks(0xc4203b6e00, 0xc4204980a0, 0x72, 0x9d)
	/home/yunabe/local/gocode/src/github.com/golang/glog/glog.go:769 +0xd1
github.com/golang/glog.(*loggingT).output(0x86a0a0, 0xc400000003, 0xc4204162c0, 0x85fe9a, 0x14, 0xb5, 0x0)
	/home/yunabe/local/gocode/src/github.com/golang/glog/glog.go:720 +0x358
github.com/golang/glog.(*loggingT).printDepth(0x86a0a0, 0x3, 0x2, 0xc420363ef8, 0x1, 0x1)
	/home/yunabe/local/gocode/src/github.com/golang/glog/glog.go:646 +0x12c
github.com/golang/glog.FatalDepth(0x2, 0xc420363ef8, 0x1, 0x1)
	/home/yunabe/local/gocode/src/github.com/golang/glog/glog.go:1134 +0x5f
main.(*glogLogger).Fatal(0x7f935a3b1638, 0xc4203d2080, 0x39)
	/home/yunabe/local/gocode/src/github.com/yunabe/lgo/cmd/lgo-internal/kernel.go:291 +0xa0
github.com/yunabe/lgo/jupyter/gojupyterscaffold.loggerWrapper.Fatalf(0x8667a0, 0x7f935a3b1638, 0x58c621, 0x24, 0xc420363fa8, 0x1, 0x1)
	/home/yunabe/local/gocode/src/github.com/yunabe/lgo/jupyter/gojupyterscaffold/logger.go:51 +0x7d
github.com/yunabe/lgo/jupyter/gojupyterscaffold.(*Server).Loop.func1(0xc4203a8180)
	/home/yunabe/local/gocode/src/github.com/yunabe/lgo/jupyter/gojupyterscaffold/gojupyterscaffold.go:181 +0x131
created by github.com/yunabe/lgo/jupyter/gojupyterscaffold.(*Server).Loop
	/home/yunabe/local/gocode/src/github.com/yunabe/lgo/jupyter/gojupyterscaffold/gojupyterscaffold.go:178 +0x56