W0928 00:51:39.557457   17114 x:0] FATAL ERROR: running container: starting container: loading sandbox containers: loading container "ci-gvisor-ptrace-proxy-sandbox-race-test-0": unmarshaling container metadata from "/syzkaller/managers/ptrace-proxy-sandbox-race/latest.tmp/workdir/gvisor_root/ci-gvisor-ptrace-proxy-sandbox-race-test-2/meta.json": unexpected end of JSON input