panic: Watchdog goroutine is stuck:
Stack for running G's are skipped while panicking.

DIAGNOSIS:
I0320 14:20:40.651189   56440 main.go:305] ***************************
I0320 14:20:40.651279   56440 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]
I0320 14:20:40.651337   56440 main.go:307] Version release-20200219.0-189-geddd6ce514e3
I0320 14:20:40.651373   56440 main.go:308] PID: 56440
I0320 14:20:40.651410   56440 main.go:309] UID: 0, GID: 0
I0320 14:20:40.651446   56440 main.go:310] Configuration:
I0320 14:20:40.651478   56440 main.go:311] 		RootDir: /syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root
I0320 14:20:40.651516   56440 main.go:312] 		Platform: kvm
I0320 14:20:40.651549   56440 main.go:313] 		FileAccess: exclusive, overlay: true
I0320 14:20:40.651597   56440 main.go:314] 		Network: sandbox, logging: false
I0320 14:20:40.651632   56440 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0320 14:20:40.651659   56440 main.go:316] ***************************
D0320 14:20:40.651748   56440 container.go:159] Load container "/syzkaller/managers/kvm-proxy-overlay-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0320 14:20:40.653378   56440 container.go:592] Signal container "ci-gvisor-kvm-proxy-overlay-sandbox-3": signal 0
D0320 14:20:40.653427   56440 sandbox.go:814] Signal sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0320 14:20:40.653452   56440 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0320 14:20:40.653637   56440 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0320 14:20:41.343030   56440 debug.go:128] Found sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3", PID: 17334
I0320 14:20:41.343092   56440 debug.go:137] Retrieving sandbox stacks
D0320 14:20:41.343121   56440 sandbox.go:932] Stacks sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
D0320 14:20:41.343798   56440 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-proxy-overlay-sandbox-3"
W0320 14:20:41.343858   56440 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 17334: connection refused
retrieving stacks: connecting to control server at PID 17334: connection refused
W0320 14:20:41.344002   56440 main.go:338] Failure to execute command, err: 1