panic: Watchdog goroutine is stuck:
DIAGNOSIS:
I0316 14:53:00.291481   44571 main.go:305] ***************************
I0316 14:53:00.291533   44571 main.go:306] Args: [/syzkaller/managers/kvm-direct-sandbox/current/image -root /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=kvm -file-access=exclusive -network=sandbox debug -stacks --ps ci-gvisor-kvm-direct-sandbox-2]
I0316 14:53:00.291574   44571 main.go:307] Version release-20200219.0-160-gf693e1334b6f
I0316 14:53:00.291598   44571 main.go:308] PID: 44571
I0316 14:53:00.291623   44571 main.go:309] UID: 0, GID: 0
I0316 14:53:00.291643   44571 main.go:310] Configuration:
I0316 14:53:00.291666   44571 main.go:311] 		RootDir: /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root
I0316 14:53:00.291688   44571 main.go:312] 		Platform: kvm
I0316 14:53:00.291713   44571 main.go:313] 		FileAccess: exclusive, overlay: false
I0316 14:53:00.291746   44571 main.go:314] 		Network: sandbox, logging: false
I0316 14:53:00.291768   44571 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0316 14:53:00.291797   44571 main.go:316] ***************************
D0316 14:53:00.291845   44571 container.go:159] Load container "/syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-direct-sandbox-2"
D0316 14:53:00.293109   44571 container.go:592] Signal container "ci-gvisor-kvm-direct-sandbox-2": signal 0
D0316 14:53:00.293141   44571 sandbox.go:814] Signal sandbox "ci-gvisor-kvm-direct-sandbox-2"
D0316 14:53:00.293158   44571 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-2"
D0316 14:53:00.293291   44571 urpc.go:534] urpc: successfully marshalled 110 bytes.
I0316 14:53:00.806587   44571 debug.go:128] Found sandbox "ci-gvisor-kvm-direct-sandbox-2", PID: 29836
I0316 14:53:00.806631   44571 debug.go:137] Retrieving sandbox stacks
D0316 14:53:00.806660   44571 sandbox.go:932] Stacks sandbox "ci-gvisor-kvm-direct-sandbox-2"
D0316 14:53:00.806704   44571 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-2"
W0316 14:53:00.806744   44571 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 29836: connection refused
retrieving stacks: connecting to control server at PID 29836: connection refused
W0316 14:53:00.806882   44571 main.go:338] Failure to execute command, err: 1