W0429 10:13:20.611712    4601 x:0] FATAL ERROR: waiting on pid 16: waiting on PID 16 in sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0": urpc method "containerManager.WaitPID" failed: EOF
waiting on pid 16: waiting on PID 16 in sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0": urpc method "containerManager.WaitPID" failed: EOF
DIAGNOSIS:
I0429 10:13:20.676372   63095 x:0] ***************************
I0429 10:13:20.676601   63095 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 10:13:20.676722   63095 x:0] Version release-20190304.1-154-g66bca6fc2213
I0429 10:13:20.676771   63095 x:0] PID: 63095
I0429 10:13:20.676827   63095 x:0] UID: 0, GID: 0
I0429 10:13:20.676859   63095 x:0] Configuration:
I0429 10:13:20.676871   63095 x:0] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0429 10:13:20.676894   63095 x:0] 		Platform: ptrace
I0429 10:13:20.676928   63095 x:0] 		FileAccess: shared, overlay: false
I0429 10:13:20.676987   63095 x:0] 		Network: sandbox, logging: false
I0429 10:13:20.677028   63095 x:0] 		Strace: false, max size: 1024, syscalls: []
I0429 10:13:20.677082   63095 x:0] ***************************
D0429 10:13:20.677159   63095 x:0] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0429 10:13:20.683114   63095 x:0] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-0": signal 0
D0429 10:13:20.683201   63095 x:0] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0429 10:13:20.683239   63095 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0429 10:13:20.683568   63095 x:0] urpc: successfully marshalled 117 bytes.
I0429 10:13:20.712261   63095 x:0] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0", PID: 4376
I0429 10:13:20.712335   63095 x:0] Retrieving sandbox stacks
D0429 10:13:20.712351   63095 x:0] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0429 10:13:20.712388   63095 x:0] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
W0429 10:13:20.712472   63095 x:0] FATAL ERROR: retrieving stacks: connecting to control server at PID 4376: connection refused
retrieving stacks: connecting to control server at PID 4376: connection refused