W0429 16:30:50.928896   56271 x:0] FATAL ERROR: waiting on pid 17: waiting on PID 17 in sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0": urpc method "containerManager.WaitPID" failed: EOF
DIAGNOSIS:
I0429 16:30:51.008540   15592 x:0] ***************************
I0429 16:30:51.008700   15592 x:0] Args: [/syzkaller/managers/ptrace-proxy-sandbox-race/current/image -root /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -platform=ptrace -file-access=shared -network=sandbox debug -stacks ci-gvisor-ptrace-proxy-sandbox-race-0]
I0429 16:30:51.008782   15592 x:0] Version release-20190304.1-154-g66bca6fc2213
I0429 16:30:51.008797   15592 x:0] PID: 15592
I0429 16:30:51.008840   15592 x:0] UID: 0, GID: 0
I0429 16:30:51.009149   15592 x:0] Configuration:
I0429 16:30:51.009162   15592 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0429 16:30:51.009191   15592 x:0] 		Platform: ptrace
I0429 16:30:51.009223   15592 x:0] 		FileAccess: shared, overlay: false
I0429 16:30:51.009258   15592 x:0] 		Network: sandbox, logging: false
I0429 16:30:51.009275   15592 x:0] 		Strace: false, max size: 1024, syscalls: []
I0429 16:30:51.009294   15592 x:0] ***************************
D0429 16:30:51.010067   15592 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0429 16:30:51.031933   15592 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-0": signal 0
D0429 16:30:51.032121   15592 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0429 16:30:51.032204   15592 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0429 16:30:51.033049   15592 x:0] urpc: successfully marshalled 117 bytes.
I0429 16:30:51.057017   15592 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0", PID: 55758
I0429 16:30:51.057099   15592 x:0] Retrieving sandbox stacks
D0429 16:30:51.057307   15592 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0429 16:30:51.057359   15592 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
W0429 16:30:51.057435   15592 x:0] FATAL ERROR: retrieving stacks: connecting to control server at PID 55758: connection refused
retrieving stacks: connecting to control server at PID 55758: connection refused