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

goroutine 435 [running]:
DIAGNOSIS:
I0303 06:03:31.279427   18530 main.go:296] ***************************
I0303 06:03:31.279496   18530 main.go:297] Args: [/syzkaller/managers/kvm-direct-sandbox/current/image -root /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=kvm -file-access=exclusive -network=sandbox debug -stacks --ps ci-gvisor-kvm-direct-sandbox-0]
I0303 06:03:31.279557   18530 main.go:298] Version release-20200219.0-52-gabf7ebcd38e8
I0303 06:03:31.279582   18530 main.go:299] PID: 18530
I0303 06:03:31.279614   18530 main.go:300] UID: 0, GID: 0
I0303 06:03:31.279657   18530 main.go:301] Configuration:
I0303 06:03:31.279683   18530 main.go:302] 		RootDir: /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root
I0303 06:03:31.279718   18530 main.go:303] 		Platform: kvm
I0303 06:03:31.279742   18530 main.go:304] 		FileAccess: exclusive, overlay: false
I0303 06:03:31.279799   18530 main.go:305] 		Network: sandbox, logging: false
I0303 06:03:31.279829   18530 main.go:306] 		Strace: false, max size: 1024, syscalls: []
I0303 06:03:31.279854   18530 main.go:307] ***************************
D0303 06:03:31.279949   18530 container.go:158] Load container "/syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-direct-sandbox-0"
D0303 06:03:31.281568   18530 container.go:591] Signal container "ci-gvisor-kvm-direct-sandbox-0": signal 0
D0303 06:03:31.281614   18530 sandbox.go:788] Signal sandbox "ci-gvisor-kvm-direct-sandbox-0"
D0303 06:03:31.281631   18530 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-0"
D0303 06:03:31.281928   18530 urpc.go:534] urpc: successfully marshalled 110 bytes.
I0303 06:03:31.552749   18530 debug.go:122] Found sandbox "ci-gvisor-kvm-direct-sandbox-0", PID: 12019
I0303 06:03:31.552790   18530 debug.go:131] Retrieving sandbox stacks
D0303 06:03:31.552824   18530 sandbox.go:906] Stacks sandbox "ci-gvisor-kvm-direct-sandbox-0"
D0303 06:03:31.552851   18530 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-0"
D0303 06:03:31.552919   18530 urpc.go:534] urpc: successfully marshalled 36 bytes.
W0303 06:03:31.569959   18530 error.go:48] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-sandbox-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-sandbox-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
W0303 06:03:31.570090   18530 main.go:329] Failure to execute command, err: 1