[Bug 253318] lldb: aborted when debugging named

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253318

--- Comment #5 from Dimitry Andric <dim at FreeBSD.org> ---
Looking at the stack trace, it seems the line editor was processing a tab
keypress (while being in libedit via el_wgets), and then the autocompletion
stuff got some error, which it tried to print via PrintAsync.

That uses a non-recursive mutex 'm_output_mutex' in the EditLine class, which
is also locked just before calling into el_wgets(). So I think it's getting a
EDEADLK, as described in lib/libthr/thread/thr_mutex.c:

   885  static int
   886  mutex_self_lock(struct pthread_mutex *m, const struct timespec
*abstime)
   887  {
   888          struct timespec ts1, ts2;
   889          int ret;
   890
   891          switch (PMUTEX_TYPE(m->m_flags)) {
   892          case PTHREAD_MUTEX_ERRORCHECK:
   893          case PTHREAD_MUTEX_ADAPTIVE_NP:.
   894                  if (abstime) {
...
   904                  } else {
   905                          /*
   906                           * POSIX specifies that mutexes should return
   907                           * EDEADLK if a recursive lock is detected.
   908                           */
   909                          ret = EDEADLK;
   910                  }

I think this is an upstream bug. But it would be handy to have an easier
reproduction scenario.

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