amd64/128259: "`" crashes csh

[Nate Eldredge]

The following reply was made to PR amd64/128259; it has been noted by GNATS.

From: Nate Eldredge <neldredge at math.ucsd.edu>
To: Jack Low <xxjack12xx at gmail.com>
Cc: freebsd-gnats-submit at freebsd.org, freebsd-amd64 at freebsd.org
Subject: Re: amd64/128259: "`" crashes csh
Date: Mon, 20 Oct 2008 21:16:09 -0700 (PDT)

 On Tue, 21 Oct 2008, Jack Low wrote:
 
 >> Description:
 > If you type "`" in the csh shell, the shell crashes
 >> How-To-Repeat:
 > Type "`" and hit enter.
 >> Fix:
 
 Thanks for the report, Jack.
 
 I suspect this is related to bin/125185, which involved csh improperly 
 messing with global state in a vfork'ed subshell.  Note that for both the 
 present bug and 125185, the crash does not occur if csh is run with -F to 
 use fork() instead of vfork().
 
 nate at vulcan:/usr/home/nate$ csh
 %"`"
 Unmatched `.
 Segmentation fault: 11 (core dumped)
 nate at vulcan:/usr/home/nate$ csh -F
 %"`"
 Unmatched `.
 %
 
 I'll repeat my recommendation from 125185 that -F be made the default, so 
 that vfork() is not used.
 
 I doubt that this bug is amd64 specific but don't have another machine to 
 make sure at the moment.  Probably it should be reclassified as "bin". 
 It's also present in 7.0-RELEASE, by the way.
 
 -- 
 
 Nate Eldredge
 neldredge at math.ucsd.edu