[Webkit-unassigned] [Bug 207019] New: REGRESSION: [ Mac Release wk2 ] five http/tests/cache/disk-cache/disk-cache-* tests are failing in tandem

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207019

            Bug ID: 207019
           Summary: REGRESSION: [ Mac Release wk2 ] five
                    http/tests/cache/disk-cache/disk-cache-* tests are
                    failing in tandem
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tsavell at apple.com

http/tests/cache/disk-cache/disk-cache-disable.html
http/tests/cache/disk-cache/disk-cache-last-modified.html
http/tests/cache/disk-cache/disk-cache-media.html
http/tests/cache/disk-cache/disk-cache-range.html
http/tests/cache/disk-cache/disk-cache-redirect.html

History:
https://results.webkit.org/?suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&test=http%2Ftests%2Fcache%2Fdisk-cache%2Fdisk-cache-disable.html&test=http%2Ftests%2Fcache%2Fdisk-cache%2Fdisk-cache-last-modified.html&test=http%2Ftests%2Fcache%2Fdisk-cache%2Fdisk-cache-media.html&test=http%2Ftests%2Fcache%2Fdisk-cache%2Fdisk-cache-range.html&test=http%2Ftests%2Fcache%2Fdisk-cache%2Fdisk-cache-redirect.html

These tests are failing together in tandem. They always fail on the same test runner together. I have tried to reproduce this locally but have not succeeded yet.
They all are failing with the same message of "response source: Network" instead of Disk cache. Some test upstream may be setting a bad state or the system is falling into this state. 

Results page:
https://build.webkit.org/results/Apple-Catalina-Release-WK2-Tests/r255440%20(2570)/results.html

example diff:
--- /Volumes/Data/slave/catalina-release-tests-wk2/build/layout-test-results/http/tests/cache/disk-cache/disk-cache-redirect-expected.txt
+++ /Volumes/Data/slave/catalina-release-tests-wk2/build/layout-test-results/http/tests/cache/disk-cache/disk-cache-redirect-actual.txt
@@ -7,7 +7,7 @@

 --------Testing loads from disk cache--------
 response headers: {"Status":"301","Location":"unique-cacheable"}
-response source: Disk cache
+response source: Network

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