[Webkit-unassigned] [Bug 144155] fast/frames/flattening/iframe-flattening-resize-event-count.html times out on Yosemite WK2

Sat Apr 25 19:25:19 PDT 2015

https://bugs.webkit.org/show_bug.cgi?id=144155

Alexey Proskuryakov <ap at webkit.org> changed:

           What    |Removed                     |Added
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                 CC|                            |darin at apple.com

--- Comment #5 from Alexey Proskuryakov <ap at webkit.org> ---
The logging says:

CONSOLE MESSAGE: line 36: Test timed out. Resized 7 times, got 7 events.
CONSOLE MESSAGE: line 40: Timers were scheduled at: 37.944230949506164,556.3224649522454,1564.046156941913,2555.3537160158157,3563.0944420117885,4561.856752960011,20164.311336935498

When I test locally, and print the timing data even on success, the output is:

CONSOLE MESSAGE: line 31: Timers were scheduled at: 125.79913299850887,128.9805999986129,141.93081700068433,146.540253997955,152.07373299926985,155.34578100050567,162.11933999875328,177.24060999898938,183.70886299817357,190.41601500066463,197.25199999811593,203.73337699857075,210.3919910005061,218.73386399965966,225.48055100196507,250.12134900316596,258.89310300408397,265.5821590014966,272.1203940018313,278.9613470013137,285.7946400035871,292.5488300024881,303.734835004434,310.7598240021616,319.68921900261194,326.54779400036205,335.85378299903823,342.9574070032686,353.57211700465996,360.1231889988412,370.0214600030449,377.03421500191325,387.11607600271236,400.0187960045878,407.9218039987609,416.8596780000371,423.3271519988193,429.7157410037471,435.7981600041967,442.50050999835366,454.3809640017571,461.1590260028606,470.320073000039,477.19982400303707,487.3991450003814,494.21547100064345,503.9252940041479,510.3242820041487,520.7717220037011,527.4011189976591,537.5356279982952,544.4351

This means that when the test fails, the 0-delay timers first get throttled to fire once a second, and then stall completely until the 20-second watchdog timer fires. At the same time, WebCore doesn't think that the timers are ever throttled.

Given that this happens on Yosemite only, and that WebCore doesn't know about the throttling, it smells like an issue below WebKit. At the same time, it is difficult to see how the 20-second timer could fire at exact time if the issue were below us - all these DOM timers are served by a single shared CF timer.

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