panic: Watchdog goroutine is stuck:
DIAGNOSIS:
I0316 00:59:14.739472    6684 main.go:305] ***************************
I0316 00:59:14.739569    6684 main.go:306] Args: [/syzkaller/managers/kvm-proxy-overlay-sandbox/current/image -root /syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=kvm -file-access=exclusive -overlay -network=sandbox debug -stacks --ps ci-gvisor-kvm-proxy-overlay-sandbox-3]
I0316 00:59:14.739625    6684 main.go:307] Version release-20200219.0-175-g829beebf0b67
I0316 00:59:14.739651    6684 main.go:308] PID: 6684
I0316 00:59:14.739697    6684 main.go:309] UID: 0, GID: 0
I0316 00:59:14.739721    6684 main.go:310] Configuration:
I0316 00:59:14.739748    6684 main.go:311] 		RootDir: /syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root
I0316 00:59:14.739774    6684 main.go:312] 		Platform: kvm
I0316 00:59:14.739809    6684 main.go:313] 		FileAccess: exclusive, overlay: true
I0316 00:59:14.739851    6684 main.go:314] 		Network: sandbox, logging: false
I0316 00:59:14.739882    6684 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0316 00:59:14.739911    6684 main.go:316] ***************************
D0316 00:59:14.740020    6684 container.go:159] Load container "/syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0316 00:59:14.741751    6684 container.go:592] Signal container "ci-gvisor-kvm-proxy-overlay-sandbox-3": signal 0
D0316 00:59:14.741797    6684 sandbox.go:814] Signal sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0316 00:59:14.741815    6684 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0316 00:59:14.742008    6684 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0316 00:59:15.754937    6684 debug.go:128] Found sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3", PID: 52627
I0316 00:59:15.754982    6684 debug.go:137] Retrieving sandbox stacks
D0316 00:59:15.756072    6684 sandbox.go:932] Stacks sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0316 00:59:15.756100    6684 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
W0316 00:59:15.756164    6684 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 52627: connection refused
retrieving stacks: connecting to control server at PID 52627: connection refused
W0316 00:59:15.756301    6684 main.go:338] Failure to execute command, err: 1