[Webkit-unassigned] [Bug 164923] New: Crashes in WebCore::ElementRuleCollector::matchHostPseudoClassRules

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164923

            Bug ID: 164923
           Summary: Crashes in
                    WebCore::ElementRuleCollector::matchHostPseudoClassRul
                    es
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dieter at komendera.com

Created attachment 295144
  --> https://bugs.webkit.org/attachment.cgi?id=295144&action=review
crash log

I get a lot of those crashes when interacting with Issues and Pull Requests on Github.com

Actions on GitHub issues I often, but not always, get this crash:

* assign an issue or pull request to one or multiple collaborators
* assign tags to an issue or pull request
* add a comment to an issue or pull request

I think these crashes started to happen with Safari Technology Preview Release 16.

The still happens with Release 18 (Safari 10.1, WebKit 12603.1.12) on macOS 10.12.1 (16B2555)

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.WebCore                 0x000000010a6956b0 WebCore::ElementRuleCollector::matchHostPseudoClassRules(WebCore::MatchRequest&, WebCore::StyleResolver::RuleRange&) + 240
1   com.apple.WebCore                 0x000000010a17f062 WebCore::ElementRuleCollector::matchAuthorRules(bool) + 194
2   com.apple.WebCore                 0x000000010a17ede2 WebCore::ElementRuleCollector::matchAllRules(bool, bool) + 626
3   com.apple.WebCore                 0x000000010b1a5004 WebCore::StyleResolver::styleForElement(WebCore::Element const&, WebCore::RenderStyle const*, WebCore::RuleMatchingBehavior, WebCore::RenderRegion const*, WebCore::SelectorFilter const*) + 932
4   com.apple.WebCore                 0x000000010a68caf0 WebCore::Element::resolveStyle(WebCore::RenderStyle const*) + 96
5   com.apple.WebCore                 0x000000010a60d297 WebCore::Document::styleForElementIgnoringPendingStylesheets(WebCore::Element&, WebCore::RenderStyle const*) + 71
6   com.apple.WebCore                 0x000000010a690f58 WebCore::Element::resolveComputedStyle() + 696
7   com.apple.WebCore                 0x000000010a1ca9a2 WebCore::Element::computedStyle(WebCore::PseudoId) + 194

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