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


From: Ken Brown
Subject: bug#18438: 24.4.50; assertion failed in bidi.c
Date: Wed, 24 Sep 2014 12:40:31 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

[Adding Daniel Colascione to the CC.]

On 9/24/2014 11:01 AM, Eli Zaretskii wrote:
Date: Wed, 24 Sep 2014 10:06:30 -0400
From: Ken Brown <address@hidden>
CC: Eli Zaretskii <address@hidden>

By the way, I just got the same assertion failure in bidi.c, with a
backtrace under gdb 7.8 (attached).

What is the backtrace of the other threads?

Attached.

We are left with the riddle.

That's too bad.

I have one thought: You've mentioned before the possibility that this problem is caused by interference from other threads. The one thread that exists in the Cygwin-w32 build but not in other Cygwin builds is the one used for the Windows message queue. (Thread 5 in the attached backtrace). I'm not familiar with the code involving the message queue, but is it possible that this code is not thread safe in the 64-bit Cygwin build?

Dan, can you help? In case you don't want to read through the whole bug report, the gist of the problem is this: In the Cygwin-w32 build of Emacs with checking enabled (64-bit case only), there are random assertion failures that make no sense when viewed under gdb. In other words, the assertions clearly hold according to the information provided by gdb. Eli has wondered whether code running in a different thread is somehow the cause of this.

Ken

Attachment: bt_all.txt.gz
Description: application/gzip


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