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

goroutine 2950030 [running]:
encoding/binary.littleEndian.Uint16(...)
	GOROOT/src/encoding/binary/binary.go:53
DIAGNOSIS:
I0305 09:54:20.283010   12744 main.go:305] ***************************
I0305 09:54:20.283184   12744 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-0]
I0305 09:54:20.283383   12744 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0305 09:54:20.283473   12744 main.go:308] PID: 12744
I0305 09:54:20.283584   12744 main.go:309] UID: 0, GID: 0
I0305 09:54:20.283700   12744 main.go:310] Configuration:
I0305 09:54:20.283783   12744 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0305 09:54:20.283923   12744 main.go:312] 		Platform: ptrace
I0305 09:54:20.284033   12744 main.go:313] 		FileAccess: shared, overlay: false
I0305 09:54:20.284165   12744 main.go:314] 		Network: sandbox, logging: false
I0305 09:54:20.284271   12744 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0305 09:54:20.284399   12744 main.go:316] ***************************
W0305 09:54:20.284500   12744 main.go:321] Block the TERM signal. This is only safe in tests!
D0305 09:54:20.284796   12744 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 09:54:20.292866   12744 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-0": signal 0
D0305 09:54:20.293058   12744 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 09:54:20.293247   12744 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 09:54:20.293915   12744 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0305 09:54:22.028298   12744 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0", PID: 49083
I0305 09:54:22.028486   12744 debug.go:131] Retrieving sandbox stacks
D0305 09:54:22.028600   12744 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0305 09:54:22.028754   12744 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
W0305 09:54:22.028992   12744 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 49083: connection refused
retrieving stacks: connecting to control server at PID 49083: connection refused
W0305 09:54:22.029364   12744 main.go:338] Failure to execute command, err: 1