[Bug 1799868] Re: seq command has problems near its max integer

[Kevin O'Gorman]

It's worse than I thought.  Increments of 2 fail even when aa factor of
100 away from the limit:

kevin at plato-x:~$ seq 170141183460469231731687303715884105721 1 170141183460469231731687303715884105725 | head -10
170141183460469231731687303715884105721
170141183460469231731687303715884105722
170141183460469231731687303715884105723
170141183460469231731687303715884105724
170141183460469231731687303715884105725
kevin at plato-x:~$ seq 1701411834604692317316873037158841051 2 1701411834604692317316873037158841055 | head -10
1701411834604692317282285392020635648
1701411834604692317282285392020635648
1701411834604692317282285392020635648
1701411834604692317282285392020635648
1701411834604692317282285392020635648
1701411834604692317282285392020635648
1701411834604692317282285392020635648
1701411834604692317282285392020635648
1701411834604692317282285392020635648
1701411834604692317282285392020635648
kevin at plato-x:~$

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https://bugs.launchpad.net/bugs/1799868

Title:
  seq command has problems near its max integer

Status in coreutils package in Ubuntu:
  New

Bug description:
  I can use seq(1) to generate sequences of large numbers if I use the
  default increment:

  $ seq 170141183460469231731687303715884105721 170141183460469231731687303715884105725
  170141183460469231731687303715884105721
  170141183460469231731687303715884105722
  170141183460469231731687303715884105723
  170141183460469231731687303715884105724
  170141183460469231731687303715884105725
  $

  However, if I use an increment of 2 (which should stop 2 short of the max int,) it starts with the max integer+1 (2^127) and outputs it forever:
  $ seq 170141183460469231731687303715884105721 2 170141183460469231731687303715884105725 | less
  170141183460469231731687303715884105728
  170141183460469231731687303715884105728
  170141183460469231731687303715884105728
  170141183460469231731687303715884105728
  .
  .
  .

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: coreutils 8.28-1ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
  Uname: Linux 4.15.0-36-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.4
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Oct 24 20:17:15 2018
  SourcePackage: coreutils
  UpgradeStatus: Upgraded to bionic on 2018-08-19 (66 days ago)

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