Merge branch 'for-5.2-fixes' of git://

Pull cgroup fix from Tejun Heo:
 "The cgroup2 freezer pulled in this cycle broke strace. This pull
  request includes a workaround for the problem.

  It's not a complete fix in that it may cause spurious frozen state
  flip-flops which is fairly minor. Will push a full fix once it's

* 'for-5.2-fixes' of git://
  signal: unconditionally leave the frozen state in ptrace_stop()