WARNING: DATA RACE
Read at 0x00c423bb4398 by goroutine 409:
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).Notify()
      pkg/waiter/waiter.go:177 +0xa4
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*queue).writeBytes()
      pkg/sentry/fs/tty/queue.go:189 +0x1e6
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*queue).write()
      pkg/sentry/fs/tty/queue.go:170 +0x165
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*lineDiscipline).outputQueueWrite()
      pkg/sentry/fs/tty/line_discipline.go:175 +0xf8
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*slaveFileOperations).Write()
      pkg/sentry/fs/tty/slave.go:130 +0xe7
  gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).Writev()
      pkg/sentry/fs/file.go:271 +0x1ba
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.writev()
      pkg/sentry/syscalls/linux/sys_write.go:191 +0xa1
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Write()
      pkg/sentry/syscalls/linux/sys_write.go:67 +0x295
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:162 +0x14e
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:278 +0x7d
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:241 +0xc3
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:216 +0x19c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:217 +0x157c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:95 +0x264

Previous write at 0x00c423bb4398 by goroutine 368:
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).EventRegister()
      pkg/waiter/waiter.go:159 +0x59
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*slaveFileOperations).EventRegister()
      pkg/sentry/fs/tty/slave.go:109 +0x10f
  gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).EventRegister()
      pkg/sentry/fs/file.go:175 +0x6a
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls.(*PollFD).initReadiness()
      pkg/sentry/syscalls/polling.go:61 +0x2a9
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls.Poll()
      pkg/sentry/syscalls/polling.go:96 +0x17c
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.doPoll()
      pkg/sentry/syscalls/linux/sys_poll.go:70 +0x2b5
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Ppoll()
      pkg/sentry/syscalls/linux/sys_poll.go:340 +0x105
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:162 +0x14e
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:278 +0x7d
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:241 +0xc3
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:216 +0x19c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:217 +0x157c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:95 +0x264