WARNING: DATA RACE
DIAGNOSIS:
I0227 21:41:35.857731    8085 main.go:296] ***************************
I0227 21:41:35.857851    8085 main.go:297] 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 -alsologtostderr -platform=ptrace -file-access=shared -network=sandbox -TESTONLY-unsafe-nonroot debug -stacks --ps ci-gvisor-ptrace-proxy-sandbox-race-1]
I0227 21:41:35.858018    8085 main.go:298] Version release-20200219.0-52-gabf7ebcd38e8
I0227 21:41:35.858091    8085 main.go:299] PID: 8085
I0227 21:41:35.858171    8085 main.go:300] UID: 0, GID: 0
I0227 21:41:35.858253    8085 main.go:301] Configuration:
I0227 21:41:35.858338    8085 main.go:302] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0227 21:41:35.858441    8085 main.go:303] 		Platform: ptrace
I0227 21:41:35.858548    8085 main.go:304] 		FileAccess: shared, overlay: false
I0227 21:41:35.858623    8085 main.go:305] 		Network: sandbox, logging: false
I0227 21:41:35.858706    8085 main.go:306] 		Strace: false, max size: 1024, syscalls: []
I0227 21:41:35.858782    8085 main.go:307] ***************************
W0227 21:41:35.858861    8085 main.go:312] Block the TERM signal. This is only safe in tests!
D0227 21:41:35.859852    8085 container.go:158] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0227 21:41:35.868605    8085 container.go:591] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0227 21:41:35.868778    8085 sandbox.go:788] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0227 21:41:35.869297    8085 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0227 21:41:35.870699    8085 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0227 21:41:37.717933    8085 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 53913
I0227 21:41:37.718100    8085 debug.go:131] Retrieving sandbox stacks
D0227 21:41:37.718178    8085 sandbox.go:906] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0227 21:41:37.718295    8085 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0227 21:41:37.718439    8085 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 53913: connection refused
retrieving stacks: connecting to control server at PID 53913: connection refused
W0227 21:41:37.719918    8085 main.go:329] Failure to execute command, err: 1


Error collecting stacks: failed to run ["/syzkaller/managers/ptrace-proxy-sandbox-race/current/image" "-root" "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "-watchdog-action=panic" "-network=none" "-debug" "-alsologtostderr" "-platform=ptrace" "-file-access=shared" "-network=sandbox" "-TESTONLY-unsafe-nonroot" "debug" "-stacks" "--ps" "ci-gvisor-ptrace-proxy-sandbox-race-1"]: exit status 128
I0227 21:41:35.857731    8085 main.go:296] ***************************
I0227 21:41:35.857851    8085 main.go:297] 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 -alsologtostderr -platform=ptrace -file-access=shared -network=sandbox -TESTONLY-unsafe-nonroot debug -stacks --ps ci-gvisor-ptrace-proxy-sandbox-race-1]
I0227 21:41:35.858018    8085 main.go:298] Version release-20200219.0-52-gabf7ebcd38e8
I0227 21:41:35.858091    8085 main.go:299] PID: 8085
I0227 21:41:35.858171    8085 main.go:300] UID: 0, GID: 0
I0227 21:41:35.858253    8085 main.go:301] Configuration:
I0227 21:41:35.858338    8085 main.go:302] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0227 21:41:35.858441    8085 main.go:303] 		Platform: ptrace
I0227 21:41:35.858548    8085 main.go:304] 		FileAccess: shared, overlay: false
I0227 21:41:35.858623    8085 main.go:305] 		Network: sandbox, logging: false
I0227 21:41:35.858706    8085 main.go:306] 		Strace: false, max size: 1024, syscalls: []
I0227 21:41:35.858782    8085 main.go:307] ***************************
W0227 21:41:35.858861    8085 main.go:312] Block the TERM signal. This is only safe in tests!
D0227 21:41:35.859852    8085 container.go:158] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0227 21:41:35.868605    8085 container.go:591] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0
D0227 21:41:35.868778    8085 sandbox.go:788] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0227 21:41:35.869297    8085 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0227 21:41:35.870699    8085 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0227 21:41:37.717933    8085 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 53913
I0227 21:41:37.718100    8085 debug.go:131] Retrieving sandbox stacks
D0227 21:41:37.718178    8085 sandbox.go:906] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
D0227 21:41:37.718295    8085 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1"
W0227 21:41:37.718439    8085 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 53913: connection refused
retrieving stacks: connecting to control server at PID 53913: connection refused
W0227 21:41:37.719918    8085 main.go:329] Failure to execute command, err: 1
Write at 0x00c001dca138 by goroutine 1001:
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).fetchReadView()
      pkg/sentry/socket/netstack/netstack.go:418 +0x85
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).coalescingRead()
      pkg/sentry/socket/netstack/netstack.go:2309 +0x67
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).nonBlockingRead()
      pkg/sentry/socket/netstack/netstack.go:2378 +0x183d
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).RecvMsg()
      pkg/sentry/socket/netstack/netstack.go:2507 +0x1ad
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux.recvFrom()
      pkg/sentry/syscalls/linux/sys_socket.go:871 +0x345
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux.RecvFrom()
      pkg/sentry/syscalls/linux/sys_socket.go:896 +0x88
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:170 +0x455
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:291 +0xb4
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:252 +0x109
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:227 +0x1b3
  gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:232 +0x1aaf
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:92 +0x308