WARNING: DATA RACE
Read at 0x00c42037e698 by goroutine 42:
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Entry).Next()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:150 +0x4c
  gvisor.googlesource.com/gvisor/pkg/ilist.(*List).Remove()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:125 +0x6a
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).EventUnregister()
      pkg/waiter/waiter.go:177 +0x67
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*slaveFileOperations).EventUnregister()
      pkg/sentry/fs/tty/slave.go:114 +0x96
  gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).EventUnregister()
      pkg/sentry/fs/file.go:180 +0x60
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel/epoll.(*EventPoll).Release()
      pkg/sentry/kernel/epoll/epoll.go:166 +0x14f
  gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).DecRef.func1()
      pkg/sentry/fs/file.go:123 +0xe1
  gvisor.googlesource.com/gvisor/pkg/refs.(*AtomicRefCount).DecRefWithDestructor()
      pkg/refs/refcounter.go:293 +0x197
  gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).DecRef()
      pkg/sentry/fs/file.go:117 +0x79
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Close()
      pkg/sentry/syscalls/linux/sys_file.go:690 +0x17d
  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 +0x1501
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:95 +0x264

Previous write at 0x00c42037e698 by goroutine 9:
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Entry).SetNext()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:160 +0x50
  gvisor.googlesource.com/gvisor/pkg/ilist.(*List).PushBack()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:70 +0xee
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).EventRegister()
      pkg/waiter/waiter.go:170 +0x86
  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/kernel/epoll.(*EventPoll).initEntryReadiness()
      pkg/sentry/kernel/epoll/epoll.go:309 +0x11f
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel/epoll.(*EventPoll).UpdateEntry()
      pkg/sentry/kernel/epoll/epoll.go:424 +0x20d
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls.UpdateEpoll()
      pkg/sentry/syscalls/epoll.go:93 +0x162
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.EpollCtl()
      pkg/sentry/syscalls/linux/sys_epoll.go:106 +0xc0
  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 +0x1501
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:95 +0x264