panic: runtime error: index out of range

goroutine 4072727 [running]:
DIAGNOSIS:
I0403 11:54:08.998340   43869 x:0] ***************************
I0403 11:54:08.999626   43869 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-0]
I0403 11:54:08.999681   43869 x:0] Version release-20190304.1-78-gc4caccd54042
I0403 11:54:08.999696   43869 x:0] PID: 43869
I0403 11:54:08.999728   43869 x:0] UID: 0, GID: 0
I0403 11:54:08.999744   43869 x:0] Configuration:
I0403 11:54:08.999763   43869 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0403 11:54:08.999789   43869 x:0] 		Platform: ptrace
I0403 11:54:08.999822   43869 x:0] 		FileAccess: shared, overlay: false
I0403 11:54:08.999841   43869 x:0] 		Network: sandbox, logging: false
I0403 11:54:08.999859   43869 x:0] 		Strace: false, max size: 1024, syscalls: []
I0403 11:54:08.999891   43869 x:0] ***************************
D0403 11:54:09.020694   43869 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
W0403 11:54:09.093653   43869 x:0] FATAL ERROR: container sandbox is not running
container sandbox is not running