$COMP_POINT: substring expression < 0 when tabbing after Ctrl-R sudo

[Alexey Kotlyarov]

Binary package hint: bash-completion

After confirming a command found by Ctrl-R with Tab, if it starts with sudo, the command supplied is wrong, and there are error messages on the console.

How to reproduce:
1. Run "sudo echo test command" for it to be in the history.
2. Press Ctrl-R, type "sudo ec", press Tab.
3. Press Enter.

Expected results:
$ sudo echo test command
test command
$

Actual results:
After (2):
$ bash: $COMP_POINT: substring expression < 0
bash: $COMP_POINT: substring expression < 0
bash: COMP_WORDS: bad array subscript
--
After (3):
--sudo: command not found
$

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: bash-completion 1:1.1-3ubuntu2
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Tue Apr 20 13:07:11 2010
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=ru_RU:ru:en
 PATH=(custom, user)
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: bash-completion

[Zeth (zeth0)]

I also get:

$ bash: $COMP_POINT: substring expression < 0
bash: $COMP_POINT: substring expression < 0
bash: COMP_WORDS: bad array subscript

[Pablo (palas87)]

I will say the problem is more general.

The error is displayed anytime you try to auto-complete when you are at the beginning of the line in the history.

For example: (provided you have history)
Press UP, press HOME, press TAB.

DistroRelease: Ubuntu 10.04
Package: bash-completion 1:1.1-3ubuntu2
Uname: Linux 2.6.32-26-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Tue Dic 9 23:02:33 2010
PackageArchitecture: all
SourcePackage: bash-completion

[Peter Cordes (peter-cordes)]

Not seeing this in Trusty. Assuming fixed somewhere between then and now.