https://bugzilla.wikimedia.org/show_bug.cgi?id=48393
Web browser: ---
Bug ID: 48393
Summary: Reusing object references for module variables
sometimes results in "Fatal exception of type
ScribuntoException" (Linux) or "The interpreter exited
with status 1" (Windows)
Product: MediaWiki extensions
Version: master
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Unprioritized
Component: Scribunto
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
Classification: Unclassified
Mobile Platform: ---
(Note: I do not fully understand the defect, so I will try to detail as much as
possible. My apologies in advance for the length.)
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Summary
-------
Scribunto allows creation of invalid scripts that will fail when invoked. The
invalid script appears to be related to reusing object references for module
variables:
local colors = {}
do
local FRA = {val = 1}
colors.FRA = FRA
colors.MTQ = FRA
end
p.colors = colors
------------
Reproduction
------------
* Create a module called "Module:Infobox_road/color"
* Copy the latest version from enwiki:
http://en.wikipedia.org/w/index.php?title=Module:Infobox_road/color&oldid=552689438
* Go to any page and run the following
{{#invoke:Infobox_road/color|color}}
On Linux, "Fatal exception of type ScribuntoException" is generated
On Windows, "The interpreter exited with status 1" is generated
On http://en.wikipedia.org/w/index.php?title=Wikipedia:Sandbox&action=edit,
"'background:#cedff2;'" is generated.
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Workaround
----------
* Find the following section in the above script
colors.FRA = FRA
colors.MTQ = FRA
* Delete the line "colors.MTQ = FRA"
* Rerun the #invoke. The page will now generate "'background:#cedff2;'".
-----
Notes
-----
* The Infobox_road/color module can be reduced to the following
local p = {}
local colors = {}
do
local FRA = {val = 1}
colors.FRA = FRA
colors.MTQ = FRA
end
p.colors = colors
function p.color(frame)
return 'color_val'
end
return p
This will generate the same error. Removing "colors.MTQ = FRA" will fix the
issue
* I do not know why I get different error messages on both machines. They are
both running MediaWiki 1.21 on PHP 5.4 with the latest master of Scribunto (as
of today). If this cannot be reproduced, please let me know your version of
MediaWiki / Scribunto / PHP / OS and I will try to reproduce with it.
* I do not know why http://en.wikipedia.org does not fail when invoking the
same. My best guess is that there may be some version discrepancy with English
Wikipedia in either Lua or Scribunto.
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