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From: Richard Stallman <rms@gnu.org>
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Subject: Re: SEGV in x_catch_errors_unwind (x86_64-unknown-linux-gnu)
Date: Wed, 22 Feb 2006 21:39:19 -0500
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Xref: news.gmane.org gmane.emacs.devel:50896
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    Unfortunately, this doesn't seem to solve the problem for me.  I still
    have crashes in unbind_to in xterm.c due to x_error_message == 0.
    I'm appending the backtrace from gdb.

In that case, let's do go back to the previous code and see if things
work better--as Yidong recently suggested.