panic: runtime error: index out of range

goroutine 156279 [running]:
DIAGNOSIS:
I0403 17:36:04.970225   18674 x:0] ***************************
I0403 17:36:04.970290   18674 x:0] 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 -platform=kvm -file-access=exclusive -overlay -network=sandbox debug -stacks ci-gvisor-kvm-proxy-overlay-sandbox-0]
I0403 17:36:04.970309   18674 x:0] Version release-20190304.1-74-gd14a7de65865
I0403 17:36:04.970314   18674 x:0] PID: 18674
I0403 17:36:04.970320   18674 x:0] UID: 0, GID: 0
I0403 17:36:04.970323   18674 x:0] Configuration:
I0403 17:36:04.970326   18674 x:0] 		RootDir: /syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root
I0403 17:36:04.970330   18674 x:0] 		Platform: kvm
I0403 17:36:04.970337   18674 x:0] 		FileAccess: exclusive, overlay: true
I0403 17:36:04.970343   18674 x:0] 		Network: sandbox, logging: false
I0403 17:36:04.970349   18674 x:0] 		Strace: false, max size: 1024, syscalls: []
I0403 17:36:04.970353   18674 x:0] ***************************
D0403 17:36:04.970374   18674 x:0] Load container "/syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-proxy-overlay-sandbox-0"
D0403 17:36:04.972051   18674 x:0] Signal container "ci-gvisor-kvm-proxy-overlay-sandbox-0": signal 0
D0403 17:36:04.972091   18674 x:0] Signal sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0"
D0403 17:36:04.972098   18674 x:0] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0"
D0403 17:36:04.972302   18674 x:0] urpc: successfully marshalled 117 bytes.
I0403 17:36:05.214866   18674 x:0] Found sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0", PID: 55026
I0403 17:36:05.214886   18674 x:0] Retrieving sandbox stacks
D0403 17:36:05.214890   18674 x:0] Stacks sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0"
D0403 17:36:05.214894   18674 x:0] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0"
D0403 17:36:05.214956   18674 x:0] urpc: successfully marshalled 36 bytes.
W0403 17:36:05.246785   18674 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-0" stacks: urpc method "debug.Stacks" failed: connection reset by peer