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

goroutine 208 [running]:
DIAGNOSIS:
I0227 22:12:11.740599   59874 main.go:296] ***************************
I0227 22:12:11.740747   59874 main.go:297] 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-2]
I0227 22:12:11.740919   59874 main.go:298] Version release-20200219.0-52-gabf7ebcd38e8
I0227 22:12:11.741005   59874 main.go:299] PID: 59874
I0227 22:12:11.741148   59874 main.go:300] UID: 0, GID: 0
I0227 22:12:11.741243   59874 main.go:301] Configuration:
I0227 22:12:11.741313   59874 main.go:302] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0227 22:12:11.741416   59874 main.go:303] 		Platform: ptrace
I0227 22:12:11.741504   59874 main.go:304] 		FileAccess: shared, overlay: false
I0227 22:12:11.741607   59874 main.go:305] 		Network: sandbox, logging: false
I0227 22:12:11.741688   59874 main.go:306] 		Strace: false, max size: 1024, syscalls: []
I0227 22:12:11.741762   59874 main.go:307] ***************************
W0227 22:12:11.741842   59874 main.go:312] Block the TERM signal. This is only safe in tests!
D0227 22:12:11.741988   59874 container.go:158] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0227 22:12:11.748221   59874 container.go:591] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-2": signal 0
D0227 22:12:11.748385   59874 sandbox.go:788] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0227 22:12:11.748507   59874 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0227 22:12:11.748954   59874 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0227 22:12:11.980310   59874 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2", PID: 46589
I0227 22:12:11.980459   59874 debug.go:131] Retrieving sandbox stacks
D0227 22:12:11.980550   59874 sandbox.go:906] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0227 22:12:11.980643   59874 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0227 22:12:11.980861   59874 urpc.go:534] urpc: successfully marshalled 36 bytes.
W0227 22:12:11.988342   59874 error.go:48] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W0227 22:12:11.988665   59874 main.go:329] Failure to execute command, err: 1