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

goroutine 373 [running]:
encoding/binary.littleEndian.Uint16(...)
DIAGNOSIS:
I0301 09:26:57.925400   45129 main.go:305] ***************************
I0301 09:26:57.925540   45129 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-1]
I0301 09:26:57.925751   45129 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0301 09:26:57.925826   45129 main.go:308] PID: 45129
I0301 09:26:57.925898   45129 main.go:309] UID: 0, GID: 0
I0301 09:26:57.925968   45129 main.go:310] Configuration:
I0301 09:26:57.926039   45129 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0301 09:26:57.926130   45129 main.go:312] 		Platform: ptrace
I0301 09:26:57.926187   45129 main.go:313] 		FileAccess: shared, overlay: false
I0301 09:26:57.926287   45129 main.go:314] 		Network: sandbox, logging: false
I0301 09:26:57.926374   45129 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0301 09:26:57.926459   45129 main.go:316] ***************************
W0301 09:26:57.926522   45129 main.go:321] Block the TERM signal. This is only safe in tests!
D0301 09:26:57.926670   45129 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0301 09:26:57.932766   45129 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0301 09:26:57.932874   45129 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0301 09:26:57.932964   45129 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0301 09:26:57.933342   45129 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0301 09:26:58.064588   45129 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 42796
I0301 09:26:58.064742   45129 debug.go:131] Retrieving sandbox stacks
D0301 09:26:58.064854   45129 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0301 09:26:58.064950   45129 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0301 09:26:58.065164   45129 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 42796: connection refused
retrieving stacks: connecting to control server at PID 42796: connection refused
W0301 09:26:58.065510   45129 main.go:338] Failure to execute command, err: 1