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Message-ID:	<51FFBDFF.7040501@cornell.edu>
Date:	Mon, 05 Aug 2013 11:00:15 -0400
From:	Ken Brown <kbrown AT cornell DOT edu>
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To:	cygwin AT cygwin DOT com
Subject:	Re: 64-bit emacs crashes a lot
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In-Reply-To:	<51FD5462.5020400@cs.utoronto.ca>

On 8/3/2013 3:05 PM, Ryan Johnson wrote:
> On 02/08/2013 8:07 AM, Ryan Johnson wrote:
>> On 02/08/2013 7:04 AM, Ken Brown wrote:
>>> On 8/2/2013 4:02 AM, Corinna Vinschen wrote:
>>>> On Aug  1 22:46, Ryan Johnson wrote:
>>>>> Here's a new one... I started a compilation, but before it actually
>>>>> invoked the command it started pegging the CPU. After ^G^G^G, it
>>>>> crashed with the following:
>>>>>> Auto-save? (y or n) y
>>>>>>       0 [main] emacs 5076 C:\cygwin64\bin\emacs-nox.exe: *** fatal
>>>>>> error - Internal error: TP_NUM_W_BUFS too small 2268032 >= 10.
>>>>
>>>> That looks like a memory overwrite.  2268032 is 0x229b80, which looks
>>>> suspiciously like a stack address.  And the overwritten value is on the
>>>> stack, too, well within the cygwin TLS area.  If *this* value gets
>>>> overwritten, the TLS is probbaly totally hosed at this point. There's
>>>> just no way to infer the culprit from this limited info.
>>>
>>> Could this be BLODA?  Ryan, I noticed that you wrote in a different
>>> thread, "I recently migrated to 64-bit cygwin...and so far have not
>>> had to disable Windows Defender; the latter was a recurring source of
>>> trouble for my previous 32-bit cygwin install on Win7/64."
>> This would be a whole new level of nasty from a BLODA... I thought
>> they only interfered with fork()?
>>
>> However, this *is* Windows Defender we're talking about... service
>> disabled and all cygwin processes restarted. I'll let you know in a
>> day or so if the crashes go away.
> Rats. I just had another crash, the "Fatal error 6" variety. Windows
> Defender has not turned itself back on (it's been known to do that), and
> a scan of the BLODA list didn't match anything else on my system.
>
> So I don't think it's BLODA...
>
> Ideas?

Not really, other than the obvious: (a) Find a reproducible way of 
making emacs-nox crash.  (b) Catch the crash in gdb by setting a 
suitable break point.

Ken

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