[Bug 1295467] [NEW] bash crashes when attempting to run a "X!" where X is a single letter

[Craig Miskell]

Public bug reported:

Attempting to run "q!" (yes, I was wrong-window typing vim commands into bash) causes:
q!: command not found

malloc: /usr/homes/chet/src/bash/src/parse.y:2314: assertion botched
realloc: start and end chunk sizes differ
Aborting...Connection to machinename closed.

Occurs with any single letter followed by !, or a lone !.  Does not
occur with ! followed by one or more characters.

It is not the command-not-found package (removing that was my first
diagnosis attempt).  I don't really know what else to try.

It happens on the two Trusty Tahr servers available to me, but not Saucy
or earlier.

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

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https://bugs.launchpad.net/bugs/1295467

Title:
  bash crashes when attempting to run a "X!" where X is a single letter

Status in “bash” package in Ubuntu:
  New

Bug description:
  Attempting to run "q!" (yes, I was wrong-window typing vim commands into bash) causes:
  q!: command not found

  malloc: /usr/homes/chet/src/bash/src/parse.y:2314: assertion botched
  realloc: start and end chunk sizes differ
  Aborting...Connection to machinename closed.

  Occurs with any single letter followed by !, or a lone !.  Does not
  occur with ! followed by one or more characters.

  It is not the command-not-found package (removing that was my first
  diagnosis attempt).  I don't really know what else to try.

  It happens on the two Trusty Tahr servers available to me, but not
  Saucy or earlier.

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