panic: runtime error: index out of range

goroutine 1515 [running]:
DIAGNOSIS:
I0329 23:04:31.813061   34592 x:0] ***************************
I0329 23:04:31.813182   34592 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]
I0329 23:04:31.813259   34592 x:0] Git Revision: ed23f547093e705ba3d6f82b2ce49592180f9a5a
I0329 23:04:31.813275   34592 x:0] PID: 34592
I0329 23:04:31.813293   34592 x:0] UID: 0, GID: 0
I0329 23:04:31.813313   34592 x:0] Configuration:
I0329 23:04:31.813323   34592 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0329 23:04:31.813336   34592 x:0] 		Platform: ptrace
I0329 23:04:31.813361   34592 x:0] 		FileAccess: shared, overlay: false
I0329 23:04:31.813388   34592 x:0] 		Network: sandbox, logging: false
I0329 23:04:31.813406   34592 x:0] 		Strace: false, max size: 1024, syscalls: []
I0329 23:04:31.813434   34592 x:0] ***************************
D0329 23:04:31.813509   34592 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0329 23:04:31.833721   34592 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0329 23:04:31.833827   34592 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0329 23:04:31.833874   34592 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0329 23:04:31.834330   34592 x:0] urpc: successfully marshalled 117 bytes.
I0329 23:04:31.956428   34592 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 26979
I0329 23:04:31.956501   34592 x:0] Retrieving sandbox stacks
D0329 23:04:31.956520   34592 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0329 23:04:31.956578   34592 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0329 23:04:31.956655   34592 x:0] FATAL ERROR: retrieving stacks: connecting to control server at PID 26979: connection refused
retrieving stacks: connecting to control server at PID 26979: connection refused