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

goroutine 950 [running]:
DIAGNOSIS:
I0301 10:57:35.832018   20870 main.go:296] ***************************
I0301 10:57:35.832081   20870 main.go:297] Args: [/syzkaller/managers/kvm-proxy-overlay-sandbox/current/image -root /syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=kvm -file-access=exclusive -overlay -network=sandbox debug -stacks --ps ci-gvisor-kvm-proxy-overlay-sandbox-0]
I0301 10:57:35.832135   20870 main.go:298] Version release-20200219.0-52-gabf7ebcd38e8
I0301 10:57:35.832164   20870 main.go:299] PID: 20870
I0301 10:57:35.832189   20870 main.go:300] UID: 0, GID: 0
I0301 10:57:35.832212   20870 main.go:301] Configuration:
I0301 10:57:35.832239   20870 main.go:302] 		RootDir: /syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root
I0301 10:57:35.832278   20870 main.go:303] 		Platform: kvm
I0301 10:57:35.832307   20870 main.go:304] 		FileAccess: exclusive, overlay: true
I0301 10:57:35.832356   20870 main.go:305] 		Network: sandbox, logging: false
I0301 10:57:35.832395   20870 main.go:306] 		Strace: false, max size: 1024, syscalls: []
I0301 10:57:35.832434   20870 main.go:307] ***************************
D0301 10:57:35.832507   20870 container.go:158] Load container "/syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-proxy-overlay-sandbox-0"
D0301 10:57:35.834252   20870 container.go:591] Signal container "ci-gvisor-kvm-proxy-overlay-sandbox-0": signal 0
D0301 10:57:35.834293   20870 sandbox.go:788] Signal sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0"
D0301 10:57:35.834316   20870 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0"
D0301 10:57:35.834506   20870 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0301 10:57:36.164169   20870 debug.go:122] Found sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0", PID: 18090
I0301 10:57:36.164244   20870 debug.go:131] Retrieving sandbox stacks
D0301 10:57:36.164278   20870 sandbox.go:906] Stacks sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0"
D0301 10:57:36.164327   20870 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0"
D0301 10:57:36.164403   20870 urpc.go:534] urpc: successfully marshalled 36 bytes.
W0301 10:57:36.181348   20870 error.go:48] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W0301 10:57:36.181464   20870 main.go:329] Failure to execute command, err: 1