bug#18438: 24.4.50; assertion failed in bidi.c

[aidalgol@amuri.net]

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On Tue, 21 Oct 2014 17:12:26 -0400, Ken Brown wrote:
> On 10/21/2014 3:38 PM, aidalgol@amuri.net wrote:
>> Yes, that is correct.  Which version of Windows are the other four
>> people using?  (I'm on Windows 7.)
>
> I'm also on Windows 7, as is Markus (bug#17753).  I don't know about
> Jon (bug#18769).  In any case, I'm about to release emacs-24.4 for 
> the
> Cygwin distribution, with checking enabled.  So we'll probably be
> getting some more data points.

I've written a GDB command to print the full backtrace for all threads, 
which may be of use to the others experiencing this bug.

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import gdb

class ExhaustiveBacktrace(gdb.Command):
  """Get full backtraces for all threads.

  Also gets full xbacktrace for the first thread.  This command
  assumes that the xbacktrace hook for backtrace has been disabled.

  """
  def __init__(self):
    super(ExhaustiveBacktrace, self).__init__("exhaustive-backtrace", gdb.COMMAND_STACK)

  def invoke(self, arg, from_tty):
    # Turn pagination off until we're done.
    pagination = ("State of pagination is on." == gdb.execute("show pagination", to_string=True))
    gdb.execute("set pagination off")

    initial_thread = gdb.selected_thread()
    gdb.execute("info threads")
    gdb.write("Full backtrace for main thread\n")
    gdb.execute("backtrace full")
    gdb.execute("xbacktrace full")
    threads = list(gdb.selected_inferior().threads())
    threads.remove(initial_thread)
    threads.reverse()
    for t in threads:
      gdb.write("Full backtrace for thread {}\n".format(t.num))
      t.switch()
      gdb.execute("backtrace full")

    # Turn pagination back on if it was on when we started.
    if pagination:
      gdb.execute("set pagination on")

ExhaustiveBacktrace()