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

goroutine 374 [running]:
DIAGNOSIS:
I0229 19:58:00.263752     632 main.go:296] ***************************
I0229 19:58:00.263812     632 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-2]
I0229 19:58:00.263870     632 main.go:298] Version release-20200219.0-52-gabf7ebcd38e8
I0229 19:58:00.263916     632 main.go:299] PID: 632
I0229 19:58:00.263944     632 main.go:300] UID: 0, GID: 0
I0229 19:58:00.263969     632 main.go:301] Configuration:
I0229 19:58:00.263998     632 main.go:302] 		RootDir: /syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root
I0229 19:58:00.264036     632 main.go:303] 		Platform: kvm
I0229 19:58:00.264076     632 main.go:304] 		FileAccess: exclusive, overlay: true
I0229 19:58:00.264128     632 main.go:305] 		Network: sandbox, logging: false
I0229 19:58:00.264171     632 main.go:306] 		Strace: false, max size: 1024, syscalls: []
I0229 19:58:00.264201     632 main.go:307] ***************************
D0229 19:58:00.264261     632 container.go:158] Load container "/syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-proxy-overlay-sandbox-2"
D0229 19:58:00.265938     632 container.go:591] Signal container "ci-gvisor-kvm-proxy-overlay-sandbox-2": signal 0
D0229 19:58:00.265978     632 sandbox.go:788] Signal sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2"
D0229 19:58:00.265994     632 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2"
D0229 19:58:00.266186     632 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0229 19:58:00.436149     632 debug.go:122] Found sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2", PID: 64920
I0229 19:58:00.436197     632 debug.go:131] Retrieving sandbox stacks
D0229 19:58:00.436220     632 sandbox.go:906] Stacks sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2"
D0229 19:58:00.436249     632 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2"
D0229 19:58:00.436316     632 urpc.go:534] urpc: successfully marshalled 36 bytes.
W0229 19:58:00.448961     632 error.go:48] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W0229 19:58:00.449121     632 main.go:329] Failure to execute command, err: 1