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

goroutine 815828 [running]:
encoding/binary.littleEndian.Uint16(...)
	GOROOT/src/encoding/binary/binary.go:53
DIAGNOSIS:
I0304 00:18:11.558780   44469 main.go:305] ***************************
I0304 00:18:11.558910   44469 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]
I0304 00:18:11.559101   44469 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0304 00:18:11.559191   44469 main.go:308] PID: 44469
I0304 00:18:11.559267   44469 main.go:309] UID: 0, GID: 0
I0304 00:18:11.559347   44469 main.go:310] Configuration:
I0304 00:18:11.559398   44469 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0304 00:18:11.559510   44469 main.go:312] 		Platform: ptrace
I0304 00:18:11.559603   44469 main.go:313] 		FileAccess: shared, overlay: false
I0304 00:18:11.559744   44469 main.go:314] 		Network: sandbox, logging: false
I0304 00:18:11.559828   44469 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0304 00:18:11.559962   44469 main.go:316] ***************************
W0304 00:18:11.560052   44469 main.go:321] Block the TERM signal. This is only safe in tests!
D0304 00:18:11.560253   44469 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0304 00:18:11.567683   44469 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-3": signal 0
D0304 00:18:11.567862   44469 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0304 00:18:11.568017   44469 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0304 00:18:11.568587   44469 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0304 00:18:12.689486   44469 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3", PID: 12615
I0304 00:18:12.689623   44469 debug.go:131] Retrieving sandbox stacks
D0304 00:18:12.689703   44469 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0304 00:18:12.689809   44469 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
W0304 00:18:12.689941   44469 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 12615: connection refused
retrieving stacks: connecting to control server at PID 12615: connection refused
W0304 00:18:12.690280   44469 main.go:338] Failure to execute command, err: 1