panic: runtime error: index out of range

goroutine 507767 [running]:
DIAGNOSIS:
I0404 01:03:30.733545   20214 x:0] ***************************
I0404 01:03:30.733609   20214 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-1]
I0404 01:03:30.733627   20214 x:0] Version release-20190304.1-70-g1df3fa699774
I0404 01:03:30.733632   20214 x:0] PID: 20214
I0404 01:03:30.733639   20214 x:0] UID: 0, GID: 0
I0404 01:03:30.733642   20214 x:0] Configuration:
I0404 01:03:30.733645   20214 x:0] 		RootDir: /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root
I0404 01:03:30.733648   20214 x:0] 		Platform: kvm
I0404 01:03:30.733662   20214 x:0] 		FileAccess: exclusive, overlay: false
I0404 01:03:30.733669   20214 x:0] 		Network: sandbox, logging: false
I0404 01:03:30.733688   20214 x:0] 		Strace: false, max size: 1024, syscalls: []
I0404 01:03:30.733692   20214 x:0] ***************************
D0404 01:03:30.734152   20214 x:0] Load container "/syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-direct-sandbox-1"
D0404 01:03:30.738956   20214 x:0] Signal container "ci-gvisor-kvm-direct-sandbox-1": signal 0
D0404 01:03:30.738992   20214 x:0] Signal sandbox "ci-gvisor-kvm-direct-sandbox-1"
D0404 01:03:30.739289   20214 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-1"
D0404 01:03:30.740517   20214 x:0] urpc: successfully marshalled 110 bytes.
I0404 01:03:31.227596   20214 x:0] Found sandbox "ci-gvisor-kvm-direct-sandbox-1", PID: 62320
I0404 01:03:31.227625   20214 x:0] Retrieving sandbox stacks
D0404 01:03:31.227631   20214 x:0] Stacks sandbox "ci-gvisor-kvm-direct-sandbox-1"
D0404 01:03:31.227636   20214 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-1"
D0404 01:03:31.227694   20214 x:0] urpc: successfully marshalled 36 bytes.
W0404 01:03:31.299541   20214 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-sandbox-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-sandbox-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer