panic: runtime error: index out of range

goroutine 1142 [running]:
DIAGNOSIS:
I0329 23:23:33.290439   28298 x:0] ***************************
I0329 23:23:33.290571   28298 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]
I0329 23:23:33.290617   28298 x:0] Git Revision: ed23f547093e705ba3d6f82b2ce49592180f9a5a
I0329 23:23:33.290631   28298 x:0] PID: 28298
I0329 23:23:33.290673   28298 x:0] UID: 0, GID: 0
I0329 23:23:33.290690   28298 x:0] Configuration:
I0329 23:23:33.290700   28298 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0329 23:23:33.290713   28298 x:0] 		Platform: ptrace
I0329 23:23:33.290734   28298 x:0] 		FileAccess: shared, overlay: false
I0329 23:23:33.290751   28298 x:0] 		Network: sandbox, logging: false
I0329 23:23:33.290768   28298 x:0] 		Strace: false, max size: 1024, syscalls: []
I0329 23:23:33.290797   28298 x:0] ***************************
D0329 23:23:33.290855   28298 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0329 23:23:33.296322   28298 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-2": signal 0
D0329 23:23:33.296383   28298 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0329 23:23:33.296412   28298 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0329 23:23:33.296736   28298 x:0] urpc: successfully marshalled 117 bytes.
I0329 23:23:33.451036   28298 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2", PID: 18234
I0329 23:23:33.451086   28298 x:0] Retrieving sandbox stacks
D0329 23:23:33.451100   28298 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0329 23:23:33.451163   28298 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
W0329 23:23:33.451278   28298 x:0] FATAL ERROR: retrieving stacks: connecting to control server at PID 18234: connection refused
retrieving stacks: connecting to control server at PID 18234: connection refused