[Webkit-unassigned] [Bug 190284] New: REGRESSION (r236730) ASSERTION FAILED: !m_text.isNull() :0x119a04cc3 WebCore::MockRealtimeVideoSource::drawText(WebCore::GraphicsContext&)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190284

            Bug ID: 190284
           Summary: REGRESSION (r236730) ASSERTION FAILED:
                    !m_text.isNull() :0x119a04cc3
                    WebCore::MockRealtimeVideoSource::drawText(WebCore::Gr
                    aphicsContext&)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jlewis3 at apple.com
                CC: eric.carlson at apple.com, ryanhaddad at apple.com,
                    tsavell at apple.com, youennf at gmail.com

Created attachment 351605

  --> https://bugs.webkit.org/attachment.cgi?id=351605&action=review

get-display-media-prompt-crash-log.txt

ASSERTION FAILED: !m_text.isNull()
/Volumes/Data/slave/sierra-debug/build/Source/WebCore/platform/graphics/TextRun.h(60) : WebCore::TextRun::TextRun(const WTF::String &, float, float, ExpansionBehavior, WebCore::TextDirection, bool, bool)
1   0x125bd9209 WTFCrash
2   0x116ae9fdb WTFCrashWithInfo(int, char const*, char const*, int)
3   0x119022f49 WebCore::TextRun::TextRun(WTF::String const&, float, float, unsigned int, WebCore::TextDirection, bool, bool)
4   0x119011d1f WebCore::TextRun::TextRun(WTF::String const&, float, float, unsigned int, WebCore::TextDirection, bool, bool)
5   0x119a04cc3 WebCore::MockRealtimeVideoSource::drawText(WebCore::GraphicsContext&)
6   0x119a02786 WebCore::MockRealtimeVideoSource::generateFrame()
7   0x119a15405 WTF::RunLoop::Timer<WebCore::MockRealtimeVideoSource>::fired()
8   0x125c59d11 WTF::RunLoop::TimerBase::timerFired(__CFRunLoopTimer*, void*)
9   0x7fff9a3d0e04 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__
10  0x7fff9a3d0a93 __CFRunLoopDoTimer
11  0x7fff9a3d05ea __CFRunLoopDoTimers
12  0x7fff9a3c7fc1 __CFRunLoopRun
13  0x7fff9a3c7544 CFRunLoopRunSpecific
14  0x7fff99926ebc RunCurrentEventLoopInMode
15  0x7fff99926cf1 ReceiveNextEventCommon
16  0x7fff99926b26 _BlockUntilNextEventMatchingListInModeWithFilter
17  0x7fff97ebda54 _DPSNextEvent
18  0x7fff986397ee -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]
19  0x7fff97eb23db -[NSApplication run]
20  0x7fff97e7ce0e NSApplicationMain
21  0x7fffb01ea8c7 _xpc_objc_main
22  0x7fffb01e92e4 xpc_main
23  0x10f44e08e WebKit::XPCServiceMain(int, char const**)
24  0x10f44e382 main
25  0x7fffaff91235 start
26  0x1
LEAK: 1 WebPageProxy


http/tests/media/media-stream/get-display-media-prompt.html is crashing consistently on macOS Sierra and HighSierra Debug and is getting an invalid crash with macOS Mojave Debug.
https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=http%2Ftests%2Fmedia%2Fmedia-stream%2Fget-display-media-prompt.html

https://build.webkit.org/results/Apple%20Sierra%20Debug%20WK2%20(Tests)/r236828%20(8227)/results.html

It looks to have started after https://trac.webkit.org/changeset/236730/webkit

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