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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <160312082029.ZM2340@torch.brasslantern.com>
Date: Sat, 12 Mar 2016 08:20:29 -0800
In-Reply-To: <20160312031116.GC28459@zira.vinc17.org>
Comments: In reply to Vincent Lefevre <vincent@vinc17.net>
        "Re: segfault in completion for configure" (Mar 12,  4:11am)
References: <20160311134729.GA32476@cventin.lip.ens-lyon.fr> 
	<20160311143202.4008e29b@pwslap01u.europe.root.pri> 
	<160311150056.ZM30997@torch.brasslantern.com> 
	<20160312031116.GC28459@zira.vinc17.org>
To: zsh-workers@zsh.org
Subject: Re: segfault in completion for configure
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On Mar 12,  4:11am, Vincent Lefevre wrote:
}
} On 2016-03-11 15:00:56 -0800, Bart Schaefer wrote:
} > [...] if you have a TRAPCHLD function it's
} > possible that it's corrupting something.
} 
} I can't reproduce the bug if I remove:
} 
}   [[ -n $TTY && $TERM == (xterm*|dtterm|mlterm|rxvt*|screen*) ]] &&
}     {
}       [[ $TERM == screen* ]] || print -nP "\e]1;%m${ptsn:+[$ptsn]}:%.\x07"
}       print -nP "\e]2;${jobstr}${WINTITLE:+ $WINTITLE |} %n@%m - %~ | %y\x07"
}     } > /dev/tty

What if you just remove the $TERM comparisons, i.e. leave the test of
$TTY and the print statement?

There are two static globals in pattern.c:

/* Flags used in both compilation and execution */
static int patflags;                /* flags passed down to patcompile */
static int patglobflags;  /* globbing flags & approx */

I'm guessing that re-entering pattern matching during the signal handler
is messing up those globals and leading eventually to the crash.