WARNING: DATA RACE
Write at 0x00c0010d4048 by goroutine 1439:
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).fetchReadView()
      pkg/sentry/socket/netstack/netstack.go:418 +0x85
DIAGNOSIS:
I0229 18:16:20.086692   33325 main.go:305] ***************************
I0229 18:16:20.086901   33325 main.go:306] 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-2]
I0229 18:16:20.087127   33325 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0229 18:16:20.087225   33325 main.go:308] PID: 33325
I0229 18:16:20.087350   33325 main.go:309] UID: 0, GID: 0
I0229 18:16:20.087468   33325 main.go:310] Configuration:
I0229 18:16:20.087600   33325 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0229 18:16:20.087708   33325 main.go:312] 		Platform: ptrace
I0229 18:16:20.087820   33325 main.go:313] 		FileAccess: shared, overlay: false
I0229 18:16:20.088060   33325 main.go:314] 		Network: sandbox, logging: false
I0229 18:16:20.088157   33325 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0229 18:16:20.088283   33325 main.go:316] ***************************
W0229 18:16:20.088380   33325 main.go:321] Block the TERM signal. This is only safe in tests!
D0229 18:16:20.088616   33325 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0229 18:16:20.101901   33325 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-2": signal 0
D0229 18:16:20.102115   33325 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0229 18:16:20.102227   33325 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0229 18:16:20.104088   33325 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0229 18:16:21.900123   33325 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2", PID: 9924
I0229 18:16:21.900262   33325 debug.go:131] Retrieving sandbox stacks
D0229 18:16:21.900388   33325 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0229 18:16:21.900516   33325 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
W0229 18:16:21.900705   33325 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 9924: connection refused
retrieving stacks: connecting to control server at PID 9924: connection refused
W0229 18:16:21.901060   33325 main.go:338] 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-2"]: exit status 128
I0229 18:16:20.086692   33325 main.go:305] ***************************
I0229 18:16:20.086901   33325 main.go:306] 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-2]
I0229 18:16:20.087127   33325 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0229 18:16:20.087225   33325 main.go:308] PID: 33325
I0229 18:16:20.087350   33325 main.go:309] UID: 0, GID: 0
I0229 18:16:20.087468   33325 main.go:310] Configuration:
I0229 18:16:20.087600   33325 main.go:311] 		RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0229 18:16:20.087708   33325 main.go:312] 		Platform: ptrace
I0229 18:16:20.087820   33325 main.go:313] 		FileAccess: shared, overlay: false
I0229 18:16:20.088060   33325 main.go:314] 		Network: sandbox, logging: false
I0229 18:16:20.088157   33325 main.go:315] 		Strace: false, max size: 1024, syscalls: []
I0229 18:16:20.088283   33325 main.go:316] ***************************
W0229 18:16:20.088380   33325 main.go:321] Block the TERM signal. This is only safe in tests!
D0229 18:16:20.088616   33325 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0229 18:16:20.101901   33325 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-2": signal 0
D0229 18:16:20.102115   33325 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0229 18:16:20.102227   33325 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0229 18:16:20.104088   33325 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0229 18:16:21.900123   33325 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2", PID: 9924
I0229 18:16:21.900262   33325 debug.go:131] Retrieving sandbox stacks
D0229 18:16:21.900388   33325 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
D0229 18:16:21.900516   33325 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-2"
W0229 18:16:21.900705   33325 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 9924: connection refused
retrieving stacks: connecting to control server at PID 9924: connection refused
W0229 18:16:21.901060   33325 main.go:338] Failure to execute command, err: 1
  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 +0x183f
  gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).Read()
      pkg/sentry/socket/netstack/netstack.go:442 +0x13c
  gvisor.dev/gvisor/pkg/sentry/fs.(*File).Readv()
      pkg/sentry/fs/file.go:270 +0x22f
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux.readv()
      pkg/sentry/syscalls/linux/sys_read.go:292 +0xe0
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Read()
      pkg/sentry/syscalls/linux/sys_read.go:72 +0x2ab
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:170 +0x44d
  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 +0x1aaa
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:92 +0x320