Bug 224699

Summary: REGRESSION (r275890-r275887?): [ macOS Release wk2 ] TestWebKitAPI.WebKit.ResizeReversePaginatedWebView is failing
Product: WebKit Reporter: Robert Jenner <jenner>
Component: Layout and RenderingAssignee: Tim Horton <thorton>
Status: RESOLVED FIXED    
Severity: Normal CC: ap, beidson, bfulgham, ggaren, megan_gardner, sihui_liu, simon.fraser, thorton, webkit-bot-watchers-bugzilla, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
Patch
ews-feeder: commit-queue-
Patch none

Description Robert Jenner 2021-04-16 15:45:11 PDT 
TestWebKitAPI.WebKit.ResizeReversePaginatedWebView

is failing and flakey crashing on Catalina and BigSur wk2 Release.

HISTORY:        
https://results.webkit.org/?suite=api-tests&test=TestWebKitAPI.WebKit.ResizeReversePaginatedWebView

/Volumes/Data/worker/bigsur-release/build/Tools/TestWebKitAPI/Tests/WebKit/ResizeReversePaginatedWebView.cpp:53
Expected equality of these values:
expectedPageCount
     Which is: 49
        pageCount
          Which is: 54
Comment 1 Radar WebKit Bug Importer 2021-04-16 15:45:41 PDT 
<rdar://problem/76782199>
Comment 2 Robert Jenner 2021-04-16 16:07:33 PDT 
The history shows a pretty clear regression point at r275890. Will work on reproducing  the failures, and verifying the regression point.
Comment 3 Alexey Proskuryakov 2021-04-19 17:10:08 PDT 
It seems super unlikely to me that it's due to r275890. But must be very close to it.

Perhaps r275889 or r275887?
Comment 4 Robert Jenner 2021-04-22 16:41:30 PDT 
I've been trying for several days to reproduce the failures, and have been unsuccessful. I've ran on Debug, Release, and Production builds. I've iterated up to 10000 runs. And I've ran in parallel using child-process=1 and child-process=50. None of which have led to a reproduction of the failure. 

Due to this, I'm still uncertain of the regress point.
Comment 5 Tim Horton 2021-05-13 02:25:57 PDT 
Created attachment 428469 [details]
Patch
Comment 6 Tim Horton 2021-05-13 02:32:30 PDT 
Created attachment 428470 [details]
Patch
Comment 7 EWS 2021-05-13 03:39:22 PDT 
Committed r277429 (237677@main): <https://commits.webkit.org/237677@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 428470 [details].