utrace known bugs

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Here are outstanding problems (aside from TODO items) I know of off hand.
These range from bug reports I haven't looked into, to subtle old XXX
comments for which I'll have to dredge up memories of the details.
I hope someone likes to wikify or otherwise organize this list somewhere.

* detach vs report race
  Alexey Dobriyan <adobriyan@xxxxx> identified a race viz
  dead_engine_ops vs engine->flags
  Race explanation makes sense, but so far never been reproduced.
  Needs a little thought.

* https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=243534
  Unknown wedge, maybe stale report

* https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=248532
  "tkill(SIGCONT) is not reported by waitpid()"

* ia64 RBS scheme
  This is tortured IA64-specific issue that was known from the start but
  never properly handled.  The original contributors of the IA64 port
  dropped the ball on this part of the implementation.  It needs someone
  with coherent understanding of the ia64 RBS hardware and how the kernel
  uses it, to consult.

* https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=207002
  crash, needs investigation

* utrace_inject_signal ENOSYS for non-utrace_get_signal case
  Needs implementation with careful synchronization.
  Probably interface details change for "engine interaction" TODO item,
  making implementation story here different.

* ptrace race conditions
  See XXX in kernel/ptrace.c; need to rethink synchronization/life-cycle
  for ptrace_state.


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