WARNING: DATA RACE
Read at 0x00c00e6bcc20 by goroutine 1269:
  gvisor.dev/gvisor/pkg/sentry/fsimpl/cgroupfs.(*cpusData).Generate()
      pkg/sentry/fsimpl/cgroupfs/cpuset.go:74 +0x5a
  gvisor.dev/gvisor/pkg/sentry/vfs.(*DynamicBytesFileDescriptionImpl).preadLocked()
      pkg/sentry/vfs/file_description_impl_util.go:293 +0x135
  gvisor.dev/gvisor/pkg/sentry/vfs.(*DynamicBytesFileDescriptionImpl).PRead()
      pkg/sentry/vfs/file_description_impl_util.go:312 +0x11d
  gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*DynamicBytesFD).PRead()
      pkg/sentry/fsimpl/kernfs/dynamic_bytes_file.go:120 +0xfd
  gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).PRead()
      pkg/sentry/vfs/file_description.go:611 +0x199
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.pread()
      pkg/sentry/syscalls/linux/vfs2/read_write.go:249 +0xfa
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Preadv()
      pkg/sentry/syscalls/linux/vfs2/read_write.go:197 +0x331
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:103 +0x452
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:238 +0xb3
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:198 +0x10e
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:173 +0x213
  gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:282 +0x12c6
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:97 +0x392

Previous write at 0x00c00e6bcc20 by goroutine 1309:
  gvisor.dev/gvisor/pkg/sentry/fsimpl/cgroupfs.(*cpusData).Write()
      pkg/sentry/fsimpl/cgroupfs/cpuset.go:104 +0x86e
  gvisor.dev/gvisor/pkg/sentry/vfs.(*DynamicBytesFileDescriptionImpl).pwriteLocked()
      pkg/sentry/vfs/file_description_impl_util.go:373 +0x32a
  gvisor.dev/gvisor/pkg/sentry/vfs.(*DynamicBytesFileDescriptionImpl).Write()
      pkg/sentry/vfs/file_description_impl_util.go:394 +0x137
  gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*DynamicBytesFD).Write()
      pkg/sentry/fsimpl/kernfs/dynamic_bytes_file.go:125 +0xf0
  gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Write()
      pkg/sentry/vfs/file_description.go:657 +0x130
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.write()
      pkg/sentry/syscalls/linux/vfs2/read_write.go:345 +0xed
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Write()
      pkg/sentry/syscalls/linux/vfs2/read_write.go:314 +0x307
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:103 +0x452
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:238 +0xb3
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:198 +0x10e
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:173 +0x213
  gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:282 +0x12c6
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:97 +0x392