[Bug 1055551] [NEW] zsh can causes ps to generate error message

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(ps|grep foo;echo)
Signal 18 (CONT) caught by ps (procps-ng version 3.3.3).
ps:display.c:59: please report this bug


(ps;echo)  # works
(ps|grep foo) # works
(ps|grep foo;echo) # fails

This behaviour seems to be caused by zsh since it is not observable
using bash. Note too that this bug cannot be recreated on precise.

zsh configuration is stock "system configuration" (run zsh for first
time and select option (2) - system defaults).

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: zsh 5.0.0-2ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-15.22-generic 3.5.4
Uname: Linux 3.5.0-15-generic i686
ApportVersion: 2.5.2-0ubuntu4
Architecture: i386
Date: Mon Sep 24 16:01:37 2012
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha i386 (20120530)
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/zsh
SourcePackage: zsh
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: procps (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 quantal running-unity
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zsh can causes ps to generate error message
https://bugs.launchpad.net/bugs/1055551
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