[Webkit-unassigned] [Bug 255700] New: REGRESSION(macOS 13.3 arm64 only, iOS 16.4): webaudio/ScriptProcessor/scriptprocessor-offlineaudiocontext.html is a constant text failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255700

            Bug ID: 255700
           Summary: REGRESSION(macOS 13.3 arm64 only, iOS 16.4):
                    webaudio/ScriptProcessor/scriptprocessor-offlineaudioc
                    ontext.html is a constant text failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Jenner at apple.com
                CC: cdumez at apple.com

webaudio/ScriptProcessor/scriptprocessor-offlineaudiocontext.html

is a constant text failure on iOS 16.4 and macOS Ventura 13.3 on Apple silicon Macs only.

HISTORY:
https://results.webkit.org/?suite=layout-tests&test=webaudio%2FScriptProcessor%2Fscriptprocessor-offlineaudiocontext.html

History indicates the first time these started to constantly fail on iOS was after we updated the bots to iOS 16.4.

It ran successfully one time on the macOS Ventura bots running 13.3. However, the build that it first tested was still built with the former Xcode version 14.0. As soon as the builder was updated to build with Xcode 14.3 it started to constantly fail, but only on Apple Silicon Macs. 


The diff is the same for both macOS and iOS.
DIFF URL:
https://build.webkit.org/results/Apple-Ventura-Release-AppleSilicon-WK2-Tests/263147@main%20(2802)/webaudio/ScriptProcessor/scriptprocessor-offlineaudiocontext-pretty-diff.html

DIFF TEXT:
 PASS   The actual content contains 3.141593 contains only the constant 3.141593.
 PASS < [simple-output] All assertions passed. (total 2 assertions)
 PASS > [oscillator-output]
-PASS   The rendered buffer contains only the constant 0.
-PASS < [oscillator-output] All assertions passed. (total 1 assertions)
-PASS # AUDIT TASK RUNNER FINISHED: 2 tasks ran successfully.
+FAIL X The rendered buffer: Expected 0 for all values but found 1476 unexpected values:
+       Index   Actual
+       [622]   -5.960464e-8
+       [732]   -5.960464e-8
+       [760]   1.788139e-7
+       [813]   -1.862645e-9
+       ...and 1472 more errors. assert_true: expected true got false
+FAIL < [oscillator-output] 1 out of 1 assertions were failed. assert_true: expected true got false
+FAIL # AUDIT TASK RUNNER FINISHED: 1 out of 2 tasks were failed. assert_true: expected true got false

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