panic: runtime error: index out of range

goroutine 722197 [running]:
DIAGNOSIS:
I0403 17:03:10.468543   60261 x:0] ***************************
I0403 17:03:10.468649   60261 x:0] Args: [/syzkaller/managers/kvm-direct-overlay-host-race/current/image -root /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=ptrace -file-access=exclusive -overlay -network=host debug -stacks ci-gvisor-kvm-direct-overlay-host-race-2]
I0403 17:03:10.468714   60261 x:0] Version release-20190304.1-78-gc4caccd54042
I0403 17:03:10.468731   60261 x:0] PID: 60261
I0403 17:03:10.468748   60261 x:0] UID: 0, GID: 0
I0403 17:03:10.468784   60261 x:0] Configuration:
I0403 17:03:10.468795   60261 x:0] 		RootDir: /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root
I0403 17:03:10.468816   60261 x:0] 		Platform: ptrace
I0403 17:03:10.468848   60261 x:0] 		FileAccess: exclusive, overlay: true
I0403 17:03:10.468888   60261 x:0] 		Network: host, logging: false
I0403 17:03:10.468907   60261 x:0] 		Strace: false, max size: 1024, syscalls: []
I0403 17:03:10.468939   60261 x:0] ***************************
D0403 17:03:10.468995   60261 x:0] Load container "/syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root" "ci-gvisor-kvm-direct-overlay-host-race-2"
D0403 17:03:10.476060   60261 x:0] Signal container "ci-gvisor-kvm-direct-overlay-host-race-2": signal 0
D0403 17:03:10.476158   60261 x:0] Signal sandbox "ci-gvisor-kvm-direct-overlay-host-race-2"
D0403 17:03:10.476197   60261 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-2"
D0403 17:03:10.477558   60261 x:0] urpc: successfully marshalled 120 bytes.
I0403 17:03:10.807679   60261 x:0] Found sandbox "ci-gvisor-kvm-direct-overlay-host-race-2", PID: 30511
I0403 17:03:10.807746   60261 x:0] Retrieving sandbox stacks
D0403 17:03:10.807791   60261 x:0] Stacks sandbox "ci-gvisor-kvm-direct-overlay-host-race-2"
D0403 17:03:10.807843   60261 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-overlay-host-race-2"
D0403 17:03:10.807994   60261 x:0] urpc: successfully marshalled 36 bytes.
W0403 17:03:10.846823   60261 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-overlay-host-race-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-overlay-host-race-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer