[Webkit-unassigned] [Bug 193004] New: resourcetimingbufferfull fired prematurely

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Dec 21 20:16:42 PST 2018


            Bug ID: 193004
           Summary: resourcetimingbufferfull fired prematurely
           Product: WebKit
           Version: Safari 12
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cvazac at gmail.com

A web-platform-test test [0] overflows the buffer, but then immediately increases the size of the buffer to make room for the new entries. In that case, a `resourcetimingbufferfull` event should never actually fire. 

In the test, resources/empty.js?xhr2 and resources/empty.js?xhr3 overflow the buffer. Which queues a task (async) to run the "fire a buffer full event" steps. Then the developer calls `setResourceTimingBufferSize()` to make more room. When the "fire a buffer full event" steps do run, "can add resource timing entry" will return true (which means we don't fire `resourcetimingbufferfull`). At that point, both entries of the secondary buffer fit into the primary buffer.

[0] https://wpt.fyi/results/resource-timing/buffer-full-then-increased.html?label=experimental

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