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

goroutine 460 [running]:
DIAGNOSIS:
I0301 11:20:35.903395   13402 main.go:296] ***************************
I0301 11:20:35.903464   13402 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-3]
I0301 11:20:35.903525   13402 main.go:298] Version release-20200219.0-52-gabf7ebcd38e8
I0301 11:20:35.903553   13402 main.go:299] PID: 13402
I0301 11:20:35.903579   13402 main.go:300] UID: 0, GID: 0
I0301 11:20:35.903605   13402 main.go:301] Configuration:
I0301 11:20:35.903632   13402 main.go:302] 		RootDir: /syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root
I0301 11:20:35.903661   13402 main.go:303] 		Platform: kvm
I0301 11:20:35.903684   13402 main.go:304] 		FileAccess: exclusive, overlay: true
I0301 11:20:35.903726   13402 main.go:305] 		Network: sandbox, logging: false
I0301 11:20:35.903751   13402 main.go:306] 		Strace: false, max size: 1024, syscalls: []
I0301 11:20:35.903777   13402 main.go:307] ***************************
D0301 11:20:35.903830   13402 container.go:158] Load container "/syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0301 11:20:35.905557   13402 container.go:591] Signal container "ci-gvisor-kvm-proxy-overlay-sandbox-3": signal 0
D0301 11:20:35.905621   13402 sandbox.go:788] Signal sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0301 11:20:35.905639   13402 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0301 11:20:35.905817   13402 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0301 11:20:36.119401   13402 debug.go:122] Found sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3", PID: 5834
I0301 11:20:36.119479   13402 debug.go:131] Retrieving sandbox stacks
D0301 11:20:36.119522   13402 sandbox.go:906] Stacks sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0301 11:20:36.119538   13402 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0301 11:20:36.119621   13402 urpc.go:534] urpc: successfully marshalled 36 bytes.
W0301 11:20:36.125538   13402 error.go:48] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W0301 11:20:36.125673   13402 main.go:329] Failure to execute command, err: 1