[Webkit-unassigned] [Bug 226474] New: [GTK] fast/text/letter-spacing-produces-nan-width-crash-log.txt crashes with an assertion

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon May 31 12:52:23 PDT 2021


https://bugs.webkit.org/show_bug.cgi?id=226474

            Bug ID: 226474
           Summary: [GTK]
                    fast/text/letter-spacing-produces-nan-width-crash-log.
                    txt crashes with an assertion
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: agoldmints at igalia.com
                CC: bfulgham at webkit.org, dpino at igalia.com,
                    lmoura at igalia.com, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 430210

  --> https://bugs.webkit.org/attachment.cgi?id=430210&action=review

Backtrace

Running the test in a debug build of the GTK minibrowser, there is an assertion tripped:

STDERR: ASSERTION FAILED: measuredWidth >= 0
STDERR: ../../Source/WebCore/rendering/ComplexLineLayout.cpp(536) : void WebCore::setLogicalWidthForTextRun(WebCore::RootInlineBox*, WebCore::BidiRun*, WebCore::RenderText&, float, const WebCore::LineInfo&, WebCore::GlyphOverflowAndFallbackFontsMap&, WebCore::VerticalPositionCache&, WebCore::WordMeasurements&)

This test was added in bug221628 and intentionally creates a NaN by combining a very large zoom with a letter-spacing of zero. The bugfix fixed this issue for other platforms by replacing a NaN with 0 in certain places but this is apparently not sufficient for GTK.

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