panic: runtime error: index out of range [1] with length 0

goroutine 444416 [running]:
encoding/binary.littleEndian.Uint16(...)
	GOROOT/src/encoding/binary/binary.go:53
DIAGNOSIS:
I0303 16:35:52.541879   33085 main.go:305] ***************************
I0303 16:35:52.542106   33085 main.go:306] Args: [/syzkaller/managers/ptrace-proxy-sandbox-race/current/image -root /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=shared -network=sandbox -TESTONLY-unsafe-nonroot debug -stacks --ps ci-gvisor-ptrace-proxy-sandbox-race-3]
I0303 16:35:52.542355   33085 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0303 16:35:52.542487   33085 main.go:308] PID: 33085
I0303 16:35:52.542605   33085 main.go:309] UID: 0, GID: 0
I0303 16:35:52.542693   33085 main.go:310] Configuration:
I0303 16:35:52.542817   33085 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0303 16:35:52.542901   33085 main.go:312] 		Platform: ptrace
I0303 16:35:52.543005   33085 main.go:313] 		FileAccess: shared, overlay: false
I0303 16:35:52.543130   33085 main.go:314] 		Network: sandbox, logging: false
I0303 16:35:52.543279   33085 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0303 16:35:52.543392   33085 main.go:316] ***************************
W0303 16:35:52.543465   33085 main.go:321] Block the TERM signal. This is only safe in tests!
D0303 16:35:52.560304   33085 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0303 16:35:52.661803   33085 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-3": signal 0
D0303 16:35:52.663349   33085 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0303 16:35:52.664396   33085 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0303 16:35:52.665019   33085 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0303 16:35:53.095054   33085 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3", PID: 23463
I0303 16:35:53.095232   33085 debug.go:131] Retrieving sandbox stacks
D0303 16:35:53.098658   33085 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0303 16:35:53.098780   33085 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
W0303 16:35:53.099009   33085 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 23463: connection refused
retrieving stacks: connecting to control server at PID 23463: connection refused
W0303 16:35:53.099343   33085 main.go:338] Failure to execute command, err: 1