Public bug reported:
The command-not-found package crashes on input of a simplified chinese
character representing a bogus command. The problem was found with in
11.10 beta1, for both the x86/i386 and amd64 systems. Debugging the
python script in /usr/lib/command-not-found shows that a
UnicodeDecodeError is thrown. The crash_guard() callback framework
catches this and reports the error.
Here are further observations.
(1) With the same simplified chinese input, 11.04 handles the test case
gracefully, returning a message
explaining that the command is not found.
(2) Between these two series, python has change: 11.04 (Python 2.7.1+)
versus 11.10 beta1 (Python 2.7.2+).
To elaborate on this problem, the following files have been included:
(1) Screen shots showing step-by-step how to reproduce the bug. As switching to
Simplified Chinese is
difficult to explain in words, a video was taken to show how this process.
(2) A screen shot showing /usr/lib/command-not-found script traced by means of
the Python pdb module.
This shows the zh_CN.UTF-8 byte stream input and the point where
UnicodeDecodeError is thrown.
This issue was investigated in 11.10 beta1 host running in VirtualBox.
===
Taken from To_Reproduce_Bug.txt attachment.
01_After_ISO_Installation.png The VirtualBox VM with default English
locale.
02_Open_Lanugage_Support.png Prepare to switch to Simplified Chinese locale.
See the accompanying video for this process.
03_Enable_IBUS_Pinyin.png After switching to Simplified Chinese. Note the
locale
environment variables. Click the IBUS keyboard
icon
and select Pinyin input.
04_Pinyin_Enabled.png Ready for Pinyin input. Note the blue
IBUS icon.
05_Type_Phonetic_Pinyin.png Type in two letters: 'w' followed by 'o'.
Phonetically these
correspond to the Chinese character
representing 'I' or 'Myself'.
IBUS displays options. You want the first one.
Hit the space
bar to choose it.
06_Chinese_Input_Complete.png Chinese 'wo' in zh_CN.UTF-8 is ready to be
passed to the Bash.
Hit the return key to do so.
07_Crash_command_not_found.png Bash calls command-not-found, which
can't handle the input.
08_Disable_Pinyin_Input.png Instruct IBUS to disable Simplified
Chinese input.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: command-not-found 0.2.43ubuntu1 [modified: usr/lib/command-not-found]
ProcVersionSignature: Ubuntu 3.0.0-9.15-generic 3.0.3
Uname: Linux 3.0.0-9-generic x86_64
Architecture: amd64
Date: Fri Sep 2 10:23:08 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
PackageArchitecture: all
SourcePackage: command-not-found
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: command-not-found (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug oneiric
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https://bugs.launchpad.net/bugs/839609
Title:
[11.10 beta1] UnicodeDecodeError crash on simplified chinese input of
fake command
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