panic: runtime error: index out of range

goroutine 9022 [running]:
DIAGNOSIS:
I0330 12:58:37.050651   29981 x:0] ***************************
I0330 12:58:37.050786   29981 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-3]
I0330 12:58:37.050866   29981 x:0] Git Revision: a046054ba35e8d8c4882f9311dc964eaa1497d58
I0330 12:58:37.051516   29981 x:0] PID: 29981
I0330 12:58:37.051542   29981 x:0] UID: 0, GID: 0
I0330 12:58:37.051557   29981 x:0] Configuration:
I0330 12:58:37.051568   29981 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0330 12:58:37.051611   29981 x:0] 		Platform: ptrace
I0330 12:58:37.051629   29981 x:0] 		FileAccess: shared, overlay: false
I0330 12:58:37.051659   29981 x:0] 		Network: sandbox, logging: false
I0330 12:58:37.051680   29981 x:0] 		Strace: false, max size: 1024, syscalls: []
I0330 12:58:37.051715   29981 x:0] ***************************
D0330 12:58:37.051784   29981 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0330 12:58:37.059575   29981 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-3": signal 0
D0330 12:58:37.059646   29981 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0330 12:58:37.059668   29981 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0330 12:58:37.059943   29981 x:0] urpc: successfully marshalled 117 bytes.
I0330 12:58:37.269655   29981 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3", PID: 25139
I0330 12:58:37.269728   29981 x:0] Retrieving sandbox stacks
D0330 12:58:37.269749   29981 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
D0330 12:58:37.269771   29981 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-3"
W0330 12:58:37.269859   29981 x:0] FATAL ERROR: retrieving stacks: connecting to control server at PID 25139: connection refused
retrieving stacks: connecting to control server at PID 25139: connection refused