panic: runtime error: index out of range

goroutine 47 [running]:
DIAGNOSIS:
I0330 00:25:37.962343   62988 x:0] ***************************
I0330 00:25:37.962519   62988 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-1]
I0330 00:25:37.962596   62988 x:0] Git Revision: ed23f547093e705ba3d6f82b2ce49592180f9a5a
I0330 00:25:37.962614   62988 x:0] PID: 62988
I0330 00:25:37.962649   62988 x:0] UID: 0, GID: 0
I0330 00:25:37.962677   62988 x:0] Configuration:
I0330 00:25:37.962693   62988 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0330 00:25:37.962714   62988 x:0] 		Platform: ptrace
I0330 00:25:37.962747   62988 x:0] 		FileAccess: shared, overlay: false
I0330 00:25:37.962768   62988 x:0] 		Network: sandbox, logging: false
I0330 00:25:37.962788   62988 x:0] 		Strace: false, max size: 1024, syscalls: []
I0330 00:25:37.962823   62988 x:0] ***************************
D0330 00:25:37.962934   62988 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0330 00:25:37.969558   62988 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0330 00:25:37.969641   62988 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0330 00:25:37.969672   62988 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0330 00:25:37.970093   62988 x:0] urpc: successfully marshalled 117 bytes.
I0330 00:25:38.052962   62988 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 61208
I0330 00:25:38.053026   62988 x:0] Retrieving sandbox stacks
D0330 00:25:38.053046   62988 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0330 00:25:38.053072   62988 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0330 00:25:38.053191   62988 x:0] FATAL ERROR: retrieving stacks: connecting to control server at PID 61208: connection refused
retrieving stacks: connecting to control server at PID 61208: connection refused