WARNING: DATA RACE
Read at 0x00c420288220 by goroutine 382:
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Entry).Prev()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:155 +0x4c
  gvisor.googlesource.com/gvisor/pkg/ilist.(*List).Remove()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:124 +0x42
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).EventUnregister()
      pkg/waiter/waiter.go:177 +0x67
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*masterFileOperations).EventUnregister()
      pkg/sentry/fs/tty/master.go:129 +0x81
  gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).EventUnregister()
      pkg/sentry/fs/file.go:180 +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.poll()
      pkg/sentry/syscalls/linux/sys_poll.go:289 +0x63
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Poll()
      pkg/sentry/syscalls/linux/sys_poll.go:307 +0x60
  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 0x00c420288220 by goroutine 521:
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Entry).SetPrev()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:165 +0x50
  gvisor.googlesource.com/gvisor/pkg/ilist.(*List).Remove()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:134 +0xc8
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).EventUnregister()
      pkg/waiter/waiter.go:177 +0x67
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*masterFileOperations).EventUnregister()
      pkg/sentry/fs/tty/master.go:130 +0xcd
  gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).EventUnregister()
      pkg/sentry/fs/file.go:180 +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.poll()
      pkg/sentry/syscalls/linux/sys_poll.go:289 +0x63
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Poll()
      pkg/sentry/syscalls/linux/sys_poll.go:307 +0x60
  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