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

[Axel Beckert]

The output "ps:display.c:59: please report this bug" is from procps-ng,
so I'd suspect it's rather an issue in procps-ng than in zsh.

The difference to bash is possible caused by differences about when
subshells are spawned and when not -- an area where the POSIX
specification is ambiguous and hence different behaviour is to be
expected.

I can also reproduce this issue with zsh from Debian Experimental (on
which Quantal's zsh package is based upon) and with zsh in Debian
Unstable and Testing (on which Precise's zsh package is based upon). In
those case procps 1:3.3.3-2 where used. But Precise has
1:3.2.8-11ubuntu6, so I guess the difference is rather the procps than
the zsh version. Reassigning.

** Package changed: zsh (Ubuntu) => procps (Ubuntu)

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https://bugs.launchpad.net/bugs/1055551

Title:
  zsh can causes ps to generate error message

Status in “procps” package in Ubuntu:
  New

Bug description:
  (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)

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