WARNING: DATA RACE
Read at 0x00c420135700 by goroutine 495:
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Entry).Next()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:154 +0x4c
  gvisor.googlesource.com/gvisor/pkg/ilist.(*List).Remove()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:127 +0x6a
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).EventUnregister()
      pkg/waiter/waiter.go:179 +0x67
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*masterFileOperations).EventUnregister()
      pkg/sentry/fs/tty/master.go:133 +0x81
  gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).EventUnregister()
      pkg/sentry/fs/file.go:182 +0x60
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls.releaseState()
      pkg/sentry/syscalls/polling.go:71 +0xb4
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls.Poll()
      pkg/sentry/syscalls/polling.go:117 +0x401
  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:342 +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:280 +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 +0x19e
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:219 +0x1501
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:95 +0x264

Previous write at 0x00c420135700 by goroutine 439:
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Entry).SetNext()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:164 +0x50
  gvisor.googlesource.com/gvisor/pkg/ilist.(*List).Remove()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:130 +0x9b
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).EventUnregister()
      pkg/waiter/waiter.go:179 +0x67
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*masterFileOperations).EventUnregister()
      pkg/sentry/fs/tty/master.go:134 +0xcd
  gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).EventUnregister()
      pkg/sentry/fs/file.go:182 +0x60
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls.releaseState()
      pkg/sentry/syscalls/polling.go:71 +0xb4
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls.Poll()
      pkg/sentry/syscalls/polling.go:117 +0x401
  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:342 +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:280 +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 +0x19e
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:219 +0x1501
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:95 +0x264