panic: Watchdog goroutine is stuck:
DIAGNOSIS:
I0315 23:36:06.837987   56324 main.go:305] ***************************
I0315 23:36:06.838044   56324 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-0]
I0315 23:36:06.838121   56324 main.go:307] Version release-20200219.0-160-gf693e1334b6f
I0315 23:36:06.838147   56324 main.go:308] PID: 56324
I0315 23:36:06.838187   56324 main.go:309] UID: 0, GID: 0
I0315 23:36:06.838220   56324 main.go:310] Configuration:
I0315 23:36:06.838248   56324 main.go:311] 		RootDir: /syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root
I0315 23:36:06.838291   56324 main.go:312] 		Platform: kvm
I0315 23:36:06.838315   56324 main.go:313] 		FileAccess: exclusive, overlay: false
I0315 23:36:06.838365   56324 main.go:314] 		Network: sandbox, logging: false
I0315 23:36:06.838394   56324 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0315 23:36:06.838420   56324 main.go:316] ***************************
D0315 23:36:06.838488   56324 container.go:159] Load container "/syzkaller/managers/kvm-direct-sandbox/workdir/gvisor_root" "ci-gvisor-kvm-direct-sandbox-0"
D0315 23:36:06.840050   56324 container.go:592] Signal container "ci-gvisor-kvm-direct-sandbox-0": signal 0
D0315 23:36:06.840098   56324 sandbox.go:814] Signal sandbox "ci-gvisor-kvm-direct-sandbox-0"
D0315 23:36:06.840113   56324 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-0"
D0315 23:36:06.840253   56324 urpc.go:534] urpc: successfully marshalled 110 bytes.
I0315 23:36:07.722041   56324 debug.go:128] Found sandbox "ci-gvisor-kvm-direct-sandbox-0", PID: 28604
I0315 23:36:07.722084   56324 debug.go:137] Retrieving sandbox stacks
D0315 23:36:07.722108   56324 sandbox.go:932] Stacks sandbox "ci-gvisor-kvm-direct-sandbox-0"
D0315 23:36:07.722121   56324 sandbox.go:318] Connecting to sandbox "ci-gvisor-kvm-direct-sandbox-0"
W0315 23:36:07.722160   56324 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 28604: connection refused
retrieving stacks: connecting to control server at PID 28604: connection refused
W0315 23:36:07.722303   56324 main.go:338] Failure to execute command, err: 1