fatal error: faultD0307 08:23:22.308167   12700 task_block.go:223] [ 43172] Interrupt queued

DIAGNOSIS:
I0307 08:23:22.611666   59177 main.go:305] ***************************
I0307 08:23:22.611737   59177 main.go:306] Args: [/syzkaller/managers/ptrace-direct-overlay-host/current/image -root /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=shared -network=host debug -stacks --ps ci-gvisor-ptrace-direct-overlay-host-2]
I0307 08:23:22.611795   59177 main.go:307] Version release-20200219.0-105-gb1576e533223
I0307 08:23:22.611818   59177 main.go:308] PID: 59177
I0307 08:23:22.611844   59177 main.go:309] UID: 0, GID: 0
I0307 08:23:22.611866   59177 main.go:310] Configuration:
I0307 08:23:22.611888   59177 main.go:311] 		RootDir: /syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root
I0307 08:23:22.611915   59177 main.go:312] 		Platform: ptrace
I0307 08:23:22.611936   59177 main.go:313] 		FileAccess: shared, overlay: false
I0307 08:23:22.611963   59177 main.go:314] 		Network: host, logging: false
I0307 08:23:22.611991   59177 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0307 08:23:22.612019   59177 main.go:316] ***************************
D0307 08:23:22.613538   59177 container.go:159] Load container "/syzkaller/managers/ptrace-direct-overlay-host/workdir/gvisor_root" "ci-gvisor-ptrace-direct-overlay-host-2"
D0307 08:23:22.620548   59177 container.go:592] Signal container "ci-gvisor-ptrace-direct-overlay-host-2": signal 0
D0307 08:23:22.620598   59177 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-direct-overlay-host-2"
D0307 08:23:22.620626   59177 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-2"
D0307 08:23:22.622066   59177 urpc.go:534] urpc: successfully marshalled 118 bytes.
I0307 08:23:25.270474   59177 debug.go:122] Found sandbox "ci-gvisor-ptrace-direct-overlay-host-2", PID: 12700
I0307 08:23:25.270528   59177 debug.go:131] Retrieving sandbox stacks
D0307 08:23:25.270548   59177 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-direct-overlay-host-2"
D0307 08:23:25.270561   59177 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-direct-overlay-host-2"
W0307 08:23:25.270594   59177 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 12700: connection refused
retrieving stacks: connecting to control server at PID 12700: connection refused
W0307 08:23:25.270727   59177 main.go:338] Failure to execute command, err: 1