fatal error: fault
DIAGNOSIS:
I0309 13:29:25.900402   59420 main.go:305] ***************************
I0309 13:29:25.900601   59420 main.go:306] Args: [/syzkaller/managers/ptrace-direct-overlay-host-race/current/image -root /syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=exclusive -overlay -network=host -TESTONLY-unsafe-nonroot debug -stacks --ps ci-gvisor-ptrace-direct-overlay-host-race-2]
I0309 13:29:25.900855   59420 main.go:307] Version release-20200219.0-105-gb1576e533223
I0309 13:29:25.901012   59420 main.go:308] PID: 59420
I0309 13:29:25.901135   59420 main.go:309] UID: 0, GID: 0
I0309 13:29:25.901261   59420 main.go:310] Configuration:
I0309 13:29:25.901401   59420 main.go:311] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root
I0309 13:29:25.901525   59420 main.go:312] 		Platform: ptrace
I0309 13:29:25.901636   59420 main.go:313] 		FileAccess: exclusive, overlay: true
I0309 13:29:25.901765   59420 main.go:314] 		Network: host, logging: false
I0309 13:29:25.901904   59420 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0309 13:29:25.902072   59420 main.go:316] ***************************
W0309 13:29:25.902189   59420 main.go:321] Block the TERM signal. This is only safe in tests!
D0309 13:29:25.903490   59420 container.go:159] Load container "/syzkaller/managers/ptrace-direct-overlay-host-race/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-race-2"
D0309 13:29:25.917823   59420 container.go:592] Signal container "ci-gvisor-ptrace-direct-overlay-host-race-2": signal 0
D0309 13:29:25.918012   59420 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-race-2"
D0309 13:29:25.918128   59420 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-race-2"
D0309 13:29:25.918619   59420 urpc.go:534] urpc: successfully marshalled 123 bytes.
I0309 13:29:26.371582   59420 debug.go:122] Found sandbox "ci-gvisor-ptrace-direct-overlay-host-race-2", PID: 35674
I0309 13:29:26.371756   59420 debug.go:131] Retrieving sandbox stacks
D0309 13:29:26.371871   59420 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-direct-overlay-host-race-2"
D0309 13:29:26.371971   59420 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-race-2"
W0309 13:29:26.372132   59420 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 35674: connection refused
retrieving stacks: connecting to control server at PID 35674: connection refused
W0309 13:29:26.372443   59420 main.go:338] Failure to execute command, err: 1