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Date: Thu, 6 Jan 2011 13:51:35 -0500
From: Ricky Zhou <ricky@rzhou.org>
To: zsh-workers@zsh.org
Subject: Re: Certain pattern causing shell to crash
Message-ID: <20110106185134.GA10630@alpha.rzhou.org>
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On 2011-01-06 06:22:01 PM, Peter Stephenson wrote:
> Yes, I can get that.  The following is about the most simple form that
> still causes it to happen:
>=20
> crashme() {
>   if [[ $1 =3D~ ^http:* ]]
>   then
>     url=3D${1#*=3D}
>   fi
> }
> which crashme
>=20
> It appears that the code that decodes the '=3D~' expression (it doesn't
> happen if I turn that into '=3D') is causing the state to go awry, so that
> the code in the line after the "then" is being read wrongly.  It's got
> something to do with the regular expression, too; putting that in
> parentheses or otherwise quoting the "^" makes it go away, so it maybe
> related to how "^" is handled in this case.  It shouldn't be too hard to
> localise; it's a shame that the the wordcode is completely
> impenetrable.
For what it's worth, I did a git bisect, and the segfault was introduced
in d234059b1c6493e5eefb6c28aa2b8a021d894d51.  Hopefully this can be of
use to somebody more familiar with how this code works.

Thanks,
Ricky

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