Wireshark · Wireshark-dev: Re: [Wireshark-dev] Debugging an assertion failure

["Maynard, Chris" <Christopher.Maynard@xxxxxxx>]

Shouldn’t that read, “Crash if there isn’t”?

 

In case the offending character isn’t obvious, maybe it’s an em dash that looks like a hyphen?  Certain software has the annoying habit of automatically converting ‘-‘ to ‘–‘, for example; maybe that happened to you Paul?

cat dashes.txt

1: -

2: –

 

hexdump -C dashes.txt

00000000  31 3a 20 2d 20 0a 32 3a  20 e2 80 93 0a           |1: - .2: ....|

0000000d

 

Just a guess.

- Chris

 

From: wireshark-dev-bounces@xxxxxxxxxxxxx [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Michael Mann
Sent: Friday, April 14, 2017 7:57 AM
To: wireshark-dev@xxxxxxxxxxxxx
Subject: Re: [Wireshark-dev] Debugging an assertion failure

 

There were a lot of suggestions on how to break on the failure point (which I can't help with), but if you just go to the line it complains about (it's slightly different in the master branch I have), you come up with:

 

* Make sure that only lower-case ASCII letters, numbers,

* underscores, hyphens, and dots appear in the name.

*

* Crash if there is, as that's an error in the code;

* you can make the title a nice string with capitalization,

* white space, punctuation, etc., but the name can be used

* on the command line, and shouldn't require quoting,

* shifting, etc.

 

So I would say the issue is that you have a invalid character in your preference name or description.

 

 

-----Original Message-----
From: Paul Offord <Paul.Offord@xxxxxxxxxxxx>
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Sent: Fri, Apr 14, 2017 6:42 am
Subject: [Wireshark-dev] Debugging an assertion failure

Hi,

 

I need some advice.  I’m debugging a problem with a dissector I’ve written.  Tshark fails with:

… \epan\prefs.c:414:prefs_register_module_or_subtree: assertion failed: (g_ascii_islower(c) || g_ascii_isdigit(c) || c == '_' || c == '-' || c == '.')

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

If I remove the dissector the problem goes away and so I’m sure it’s the cause.

 

Even though I can recreate the problem in a debug build under VS 2013 it doesn’t catch the exception.  I just see the above text flash by in the output command box.  How can I cause execution to break when it throws the exception?

 

Thanks and regards…Paul

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