[Bug 1206370] Re: subshell that instantly locks up bash, dash, ksh, tcsh, and zsh

[B Bobo]

** Also affects: ksh (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1206370

Title:
  subshell that instantly locks up bash, dash, ksh, tcsh, and zsh

Status in dash - The Debian Almquist Shell:
  New
Status in tcsh:
  New
Status in “bash” package in Ubuntu:
  New
Status in “ksh” package in Ubuntu:
  New
Status in “zsh” package in Ubuntu:
  New

Bug description:
  Type this at a shell prompt in gnome-terminal:

  $ (yes&)
  y
  y
  y
  y
  y
  y
  ...

  Denial of service. Shell becomes totally unresponsive. Subshell
  command is uninterruptible.

  An old one that affects bash, dash, ksh, tcsh, and zsh shells at least
  in all versions in Ubuntu and further back in Ubuntu pre-history too.

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