panic: runtime error: index out of range

goroutine 169438 [running]:
DIAGNOSIS:
I0403 15:38:14.142404   46172 x:0] ***************************
I0403 15:38:14.142542   46172 x:0] Args: [/syzkaller/managers/ptrace-proxy-sandbox-race/current/image -root /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=ptrace -file-access=shared -network=sandbox debug -stacks ci-gvisor-ptrace-proxy-sandbox-race-2]
I0403 15:38:14.142666   46172 x:0] Version release-20190304.1-78-gc4caccd54042
I0403 15:38:14.142700   46172 x:0] PID: 46172
I0403 15:38:14.142723   46172 x:0] UID: 0, GID: 0
I0403 15:38:14.142748   46172 x:0] Configuration:
I0403 15:38:14.142789   46172 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0403 15:38:14.142807   46172 x:0] 		Platform: ptrace
I0403 15:38:14.142837   46172 x:0] 		FileAccess: shared, overlay: false
I0403 15:38:14.142894   46172 x:0] 		Network: sandbox, logging: false
I0403 15:38:14.142925   46172 x:0] 		Strace: false, max size: 1024, syscalls: []
I0403 15:38:14.142956   46172 x:0] ***************************
D0403 15:38:14.143039   46172 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0403 15:38:14.150531   46172 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-2": signal 0
D0403 15:38:14.150634   46172 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0403 15:38:14.150662   46172 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0403 15:38:14.151254   46172 x:0] urpc: successfully marshalled 117 bytes.
I0403 15:38:14.355129   46172 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2", PID: 34788
I0403 15:38:14.355217   46172 x:0] Retrieving sandbox stacks
D0403 15:38:14.355233   46172 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0403 15:38:14.355270   46172 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0403 15:38:14.355397   46172 x:0] urpc: successfully marshalled 36 bytes.
W0403 15:38:14.385405   46172 x:0] FATAL ERROR: retrieving stacks: getting sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer
retrieving stacks: getting sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2" stacks: urpc method "debug.Stacks" failed: connection reset by peer