panic: runtime error: index out of range

goroutine 5504 [running]:
DIAGNOSIS:
I0330 13:09:01.042775   58201 x:0] ***************************
I0330 13:09:01.042855   58201 x:0] Args: [/syzkaller/managers/kvm-direct-sandbox/current/image -root /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=kvm -file-access=exclusive -network=sandbox debug -stacks ci-gvisor-kvm-direct-sandbox-3]
I0330 13:09:01.042872   58201 x:0] Git Revision: cc0e96a4bd3348ecc2a636fd90118b8e5cce672c
I0330 13:09:01.042877   58201 x:0] PID: 58201
I0330 13:09:01.042882   58201 x:0] UID: 0, GID: 0
I0330 13:09:01.042885   58201 x:0] Configuration:
I0330 13:09:01.042890   58201 x:0] 		RootDir: /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root
I0330 13:09:01.042893   58201 x:0] 		Platform: kvm
I0330 13:09:01.042908   58201 x:0] 		FileAccess: exclusive, overlay: false
I0330 13:09:01.042945   58201 x:0] 		Network: sandbox, logging: false
I0330 13:09:01.042951   58201 x:0] 		Strace: false, max size: 1024, syscalls: []
I0330 13:09:01.042956   58201 x:0] ***************************
D0330 13:09:01.042982   58201 x:0] Load container "/syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-direct-sandbox-3"
D0330 13:09:01.044513   58201 x:0] Signal container "ci-gvisor-kvm-direct-sandbox-3": signal 0
D0330 13:09:01.044545   58201 x:0] Signal sandbox "ci-gvisor-kvm-direct-sandbox-3"
D0330 13:09:01.044551   58201 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-3"
D0330 13:09:01.044674   58201 x:0] urpc: successfully marshalled 110 bytes.
I0330 13:09:01.241489   58201 x:0] Found sandbox "ci-gvisor-kvm-direct-sandbox-3", PID: 48138
I0330 13:09:01.241507   58201 x:0] Retrieving sandbox stacks
D0330 13:09:01.241511   58201 x:0] Stacks sandbox "ci-gvisor-kvm-direct-sandbox-3"
D0330 13:09:01.241515   58201 x:0] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-3"
W0330 13:09:01.241543   58201 x:0] FATAL ERROR: retrieving stacks: connecting to control server at PID 48138: connection refused
retrieving stacks: connecting to control server at PID 48138: connection refused