amd64/128259: "`" crashes csh

Nate Eldredge neldredge at
Tue Oct 21 04:40:04 UTC 2008

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

From: Nate Eldredge <neldredge at>
To: Jack Low <xxjack12xx at>
Cc: freebsd-gnats-submit at, freebsd-amd64 at
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

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