1475495 - Crash with unknown variable in XPath, <meta charset="UTF-8"/> and uBlock Origin

Status: RESOLVED WORKSFORME

(Core :: XSLT, defect, P2)

Description

[Pochang Chen]

Open a.xml:

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet href="a.xslt" type="text/xml"?>
<a></a>

This is the content of a.xslt:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:transform version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns="http://www.w3.org/1999/xhtml">
    <xsl:output method="xml" encoding="UTF-8"/>
    <xsl:template match="/">
        <meta charset="utf-8"/>
        <xsl:value-of select="$unknown_variable"/>
    </xsl:template>
</xsl:transform>

The text "Error during XSLT transformation: An unknown error has occurred ()" and a "spinning wheel" is shown.

If uBlock Origin is installed, the tab crashes after roughly 10 seconds.
Otherwise, the spinning wheel just spins forever.

Comment 1

[Andrew Overholt [:overholt]]

Thanks for the report. If you look in about:crashes, do you see anything that's been submitted to crash-stats.mozilla.com that would include a stack trace? It sounds like an OOM crash, maybe.

Comment 2

[Pochang Chen]

Just let me reproduce and submit.

https://crash-stats.mozilla.com/report/index/9d56c4ae-c9dc-435b-bd6f-781410180719
https://crash-stats.mozilla.com/report/index/e9aa9563-115b-45ff-80d3-f03800180719 (seems identical)

I forgot to mention it can also be reproduced on 61.0.1.

https://crash-stats.mozilla.com/report/index/ad215ee0-764b-448e-952f-fe7be1180719
https://crash-stats.mozilla.com/report/index/8b9ddfe9-8fde-43e1-9943-5ce901180719

Comment 3

[Andrew Overholt [:overholt]]

Thanks!

Comment 4

[Pascal Chevrel:pascalc]

Marking as new as we have a crash ID

Comment 5

[Peter Van der Beken [:peterv]]

There's something going wrong with propagating out the error.

Comment 6

[Andrew McCreight [:mccr8]]

I couldn't reproduce a hang without ublock origin or a crash with it. Maybe I did something wrong.