panic: runtime error: index out of range

goroutine 147785 [running]:
DIAGNOSIS:
I0404 05:07:13.246050   19024 x:0] ***************************
I0404 05:07:13.246123   19024 x:0] Args: [/syzkaller/managers/kvm-direct-sandbox/current/image -root /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=kvm -file-access=exclusive -network=sandbox debug -stacks ci-gvisor-kvm-direct-sandbox-2]
I0404 05:07:13.246135   19024 x:0] Version release-20190304.1-70-g1df3fa699774
I0404 05:07:13.246140   19024 x:0] PID: 19024
I0404 05:07:13.246146   19024 x:0] UID: 0, GID: 0
I0404 05:07:13.246150   19024 x:0] Configuration:
I0404 05:07:13.246153   19024 x:0] 		RootDir: /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root
I0404 05:07:13.246156   19024 x:0] 		Platform: kvm
I0404 05:07:13.246170   19024 x:0] 		FileAccess: exclusive, overlay: false
I0404 05:07:13.246181   19024 x:0] 		Network: sandbox, logging: false
I0404 05:07:13.246187   19024 x:0] 		Strace: false, max size: 1024, syscalls: []
I0404 05:07:13.246191   19024 x:0] ***************************
D0404 05:07:13.246214   19024 x:0] Load container "/syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-direct-sandbox-2"
D0404 05:07:13.247863   19024 x:0] Signal container "ci-gvisor-kvm-direct-sandbox-2": signal 0
D0404 05:07:13.247890   19024 x:0] Signal sandbox "ci-gvisor-kvm-direct-sandbox-2"
D0404 05:07:13.247896   19024 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-2"
D0404 05:07:13.248036   19024 x:0] urpc: successfully marshalled 110 bytes.
I0404 05:07:13.587388   19024 x:0] Found sandbox "ci-gvisor-kvm-direct-sandbox-2", PID: 56356
I0404 05:07:13.587416   19024 x:0] Retrieving sandbox stacks
D0404 05:07:13.587421   19024 x:0] Stacks sandbox "ci-gvisor-kvm-direct-sandbox-2"
D0404 05:07:13.587425   19024 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-2"
D0404 05:07:13.587481   19024 x:0] urpc: successfully marshalled 36 bytes.
W0404 05:07:13.630804   19024 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-sandbox-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-sandbox-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer