[Webkit-unassigned] [Bug 223144] [ macOS debug arm64 ] ASSERTION FAILED: count >= 1 ./rendering/RenderMultiColumnSet.cpp(450) : unsigned int WebCore::RenderMultiColumnSet::columnCount() const

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223144

--- Comment #7 from Chris Dumez <cdumez at apple.com> ---
The issue is that static_cast<float>(logicalHeightInColumns) is negative (-1.67771e+07). With ceil(), we end up with -108941.0 which we try to implicitly cast to an unsigned variable.

Converting a negative double into an unsigned integer type is undefined behavior. I am guessing the real issue though is that logicalHeightInColumns should likely not be negative..

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