[Webkit-unassigned] [Bug 186919] Navigation Timing data is corrupt in WebView (UIWebView/WKWebView)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186919

--- Comment #5 from krinklemail at gmail.com ---
Updated log now startingb to include iOS 14 as we start to see adoption.

Below is the aggregregate of a few hours of 1:1000 navtiming samples from Wikimedia, with first column indicating how many similar errors were seen (same out of order, same OS/browser version)

3848  Discarding event because requestStart is out of order [{u'os_minor': u'7', u'os_major': u'13', u'device_family': u'iPhone', u'os_family': u'iOS', u'browser_minor': u'1', u'browser_major': u'13', u'browser_family': u'Mobile Safari'}]
1612  Discarding event because requestStart is out of order [{u'os_minor': u'15', u'os_major': u'10', u'device_family': u'Mac', u'os_family': u'Mac OS X', u'browser_minor': u'1', u'browser_major': u'13', u'browser_family': u'Safari'}]
1474  Discarding event because requestStart is out of order [{u'os_minor': u'6', u'os_major': u'13', u'device_family': u'iPhone', u'os_family': u'iOS', u'browser_minor': u'1', u'browser_major': u'13', u'browser_family': u'Mobile Safari'}]
711  Discarding event because requestStart is out of order [{u'os_minor': u'7', u'os_major': u'13', u'device_family': u'iPhone', u'os_family': u'iOS', u'browser_minor': u'2', u'browser_major': u'125', u'browser_family': u'Google'}]
672  Discarding event because requestStart is out of order [{u'os_minor': u'5', u'os_major': u'13', u'device_family': u'iPhone', u'os_family': u'iOS', u'browser_minor': u'1', u'browser_major': u'13', u'browser_family': u'Mobile Safari'}]
665  Discarding event because requestStart is out of order [{u'os_minor': u'3', u'os_major': u'9', u'device_family': u'iPad', u'os_family': u'iOS', u'browser_minor': u'0', u'browser_major': u'9', u'browser_family': u'Mobile Safari'}]
592  Discarding event because requestStart is out of order [{u'os_minor': u'7', u'os_major': u'13', u'device_family': u'iPhone', u'os_family': u'iOS', u'browser_minor': u'0', u'browser_major': u'85', u'browser_family': u'Chrome Mobile iOS'}]
528  Discarding event because responseEnd is out of order [{u'os_minor': u'0', u'os_major': u'14', u'device_family': u'iPhone', u'os_family': u'iOS', u'browser_minor': u'0', u'browser_major': u'14', u'browser_family': u'Mobile Safari'}]
454  Discarding event because responseEnd is out of order [{u'os_minor': u'7', u'os_major': u'13', u'device_family': u'iPhone', u'os_family': u'iOS', u'browser_minor': u'1', u'browser_major': u'13', u'browser_family': u'Mobile Safari'}]
344  Discarding event because responseEnd is out of order [{u'os_minor': u'15', u'os_major': u'10', u'device_family': u'Mac', u'os_family': u'Mac OS X', u'browser_minor': u'1', u'browser_major': u'13', u'browser_family': u'Safari'}]
295  Discarding event because requestStart is out of order [{u'os_minor': u'15', u'os_major': u'10', u'device_family': u'Mac', u'os_family': u'Mac OS X', u'browser_minor': u'0', u'browser_major': u'14', u'browser_family': u'Safari'}]
259  Discarding event because responseEnd is out of order [{u'os_minor': u'15', u'os_major': u'10', u'device_family': u'Mac', u'os_family': u'Mac OS X', u'browser_minor': u'0', u'browser_major': u'14', u'browser_family': u'Safari'}]
244  Discarding event because requestStart is out of order [{u'os_minor': u'0', u'os_major': u'14', u'device_family': u'iPhone', u'os_family': u'iOS', u'browser_minor': u'0', u'browser_major': u'14', u'browser_family': u'Mobile Safari'}]
235  Discarding event because requestStart is out of order [{u'os_minor': u'3', u'os_major': u'13', u'device_family': u'iPhone', u'os_family': u'iOS', u'browser_minor': u'0', u'browser_major': u'13', u'browser_family': u'Mobile Safari'}]
193  Discarding event because requestStart is out of order [{u'os_minor': u'4', u'os_major': u'13', u'device_family': u'iPhone', u'os_family': u'iOS', u'browser_minor': u'1', u'browser_major': u'13', u'browser_family': u'Mobile Safari'}]
175  Discarding event because requestStart is out of order [{u'os_minor': u'6', u'os_major': u'13', u'device_family': u'iPhone', u'os_family': u'iOS', u'browser_minor': u'2', u'browser_major': u'125', u'browser_family': u'Google'}]
174  Discarding event because requestStart is out of order [{u'os_minor': u'6', u'os_major': u'13', u'device_family': u'iPhone', u'os_family': u'iOS', u'browser_minor': u'0', u'browser_major': u'85', u'browser_family': u'Chrome Mobile iOS'}]
166  Discarding event because responseEnd is out of order [{u'os_minor': u'6', u'os_major': u'13', u'device_family': u'iPhone', u'os_family': u'iOS', u'browser_minor': u'1', u'browser_major': u'13', u'browser_family': u'Mobile Safari'}]

Safari is (still) the only browser reporting errors with significant frequency.

'requestStart' being out of order is far far the most frequent, however we are still seeing out of order 'responseEnd' as well as you can see including on iOS 14.

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