[Bug 1583269] Re: Bash dies with a SIGABRT sporadically when doing 'read -N INTEGER'.

[xhienne]

Affects trusty too. A quick way to reproduce this is (works 9 times out of 10 here):
$ bash -c 'read -N 10000000' < /dev/urandom 

Trusty output:
$ bash -c 'read -N 10000000' < /dev/urandom 
malloc: ../.././builtins/../.././builtins/read.def:603: assertion botched
realloc: start and end chunk sizes differ
Aborting...Aborted

Xenial output:
$ bash -c 'read -N 10000000' < /dev/urandom 
malloc: ../.././builtins/../.././builtins/read.def:617: assertion botched
realloc: start and end chunk sizes differ
Aborting...Aborted

** Tags added: trusty

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https://bugs.launchpad.net/bugs/1583269

Title:
  Bash dies with a SIGABRT sporadically when doing  'read -N INTEGER'.

Status in bash package in Ubuntu:
  Confirmed

Bug description:
  Bash sometimes dies with a SIGABRT on the command
          read -N $N < /dev/urandom
  where $N represent an integer >=1.

  It occurs frequently for high values of N (>2**20).
  It occurs rarely for low values of N (<2**20).
  It has occurred more than once with a value of N as low as 128!

  With N=2**21, this command aborts approximately 5 out of 10 tries.
          ( read -N 2097152 < /dev/urandom )

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: bash 4.3-14ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed May 18 12:24:28 2016
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-formosa-beigang-precise-amd64-20130801-1
  InstallationDate: Installed on 2016-01-23 (116 days ago)
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130801-07:00
  SourcePackage: bash
  UpgradeStatus: Upgraded to xenial on 2016-04-22 (26 days ago)

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