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

goroutine 483 [running]:
DIAGNOSIS:
I0301 10:00:36.550259   43026 main.go:296] ***************************
I0301 10:00:36.550314   43026 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 10:00:36.550353   43026 main.go:298] Version release-20200219.0-52-gabf7ebcd38e8
I0301 10:00:36.550370   43026 main.go:299] PID: 43026
I0301 10:00:36.550388   43026 main.go:300] UID: 0, GID: 0
I0301 10:00:36.550414   43026 main.go:301] Configuration:
I0301 10:00:36.550431   43026 main.go:302] 		RootDir: /syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root
I0301 10:00:36.550448   43026 main.go:303] 		Platform: kvm
I0301 10:00:36.550467   43026 main.go:304] 		FileAccess: exclusive, overlay: true
I0301 10:00:36.550496   43026 main.go:305] 		Network: sandbox, logging: false
I0301 10:00:36.550514   43026 main.go:306] 		Strace: false, max size: 1024, syscalls: []
I0301 10:00:36.550531   43026 main.go:307] ***************************
D0301 10:00:36.550572   43026 container.go:158] Load container "/syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0301 10:00:36.551893   43026 container.go:591] Signal container "ci-gvisor-kvm-proxy-overlay-sandbox-3": signal 0
D0301 10:00:36.551930   43026 sandbox.go:788] Signal sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0301 10:00:36.551942   43026 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0301 10:00:36.552062   43026 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0301 10:00:36.736208   43026 debug.go:122] Found sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3", PID: 28021
I0301 10:00:36.736282   43026 debug.go:131] Retrieving sandbox stacks
D0301 10:00:36.736306   43026 sandbox.go:906] Stacks sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0301 10:00:36.736329   43026 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0301 10:00:36.736466   43026 urpc.go:534] urpc: successfully marshalled 36 bytes.
W0301 10:00:36.747495   43026 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 10:00:36.747671   43026 main.go:329] Failure to execute command, err: 1