Bug 196274 – [ Mojave WK1 iOS Sim WK2] Layout Test imported/w3c/web-platform-tests/xhr/send-redirect-post-upload.htm is a flaky crash

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: Tools / Tests

[Shawn Roberts]

Created attachment 366005 [details]
Mojave WK1 Crash

The following layout test is flaky on Mojave WK1 and iOS Simulator Release WK2

imported/w3c/web-platform-tests/xhr/send-redirect-post-upload.htm

Probable cause:

Test has been crashing for some time, most recent fix was https://trac.webkit.org/changeset/242723/webkit 

I can reproduce locally on Mojave WK1 with 5000 iterations I got it to crash once. (will attach crash logs).
I can reproduce the iOS Sim much easier, it crashed 9 times in 18 iterations before I stopped it (will attach crash logs).

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=imported%2Fw3c%2Fweb-platform-tests%2Fxhr%2Fsend-redirect-post-upload.htm

[Radar WebKit Bug Importer]

<rdar://problem/49294363>

[Shawn Roberts]

Created attachment 366007 [details]
iOS Sim Crash

[Shawn Roberts]

Updated test expectations in https://trac.webkit.org/changeset/243521/webkit

Was marked Pass Fail before, added Crash to the expectation file.

[Alex Christensen]

I'll continue to try to reproduce this and look into how to fix it.

[Alex Christensen]

I just finished running this test 20000 times with 0 crashes.  Here is what I used to run it:

run-webkit-tests --release --iterations=100 --repeat-each=200 -1 imported/w3c/web-platform-tests/xhr/send-redirect-post-upload.htm

[Chris Dumez]

(In reply to Alex Christensen from comment #5)
> I just finished running this test 20000 times with 0 crashes.  Here is what
> I used to run it:
> 
> run-webkit-tests --release --iterations=100 --repeat-each=200 -1
> imported/w3c/web-platform-tests/xhr/send-redirect-post-upload.htm

Sometimes, adding -gf helps:

run-webkit-tests --release --repeat-each=200 -1 -gf imported/w3c/web-platform-tests/xhr/send-redirect-post-upload.htm

[Shawn Roberts]

I have used -gf as well in the past as well.

In this particular case I did:

run-webkit-tests imported/w3c/web-platform-tests/xhr/send-redirect-post-upload.htm --iterations 5000 -1 -f

[Alexey Proskuryakov]

To state the obvious, Mac and iOS crash signatures look quite different.

[Alex Christensen]

*** This bug has been marked as a duplicate of bug 159724 ***

[Alex Christensen]

(In reply to Alexey Proskuryakov from comment #8)
> To state the obvious, Mac and iOS crash signatures look quite different.
bug 159724 makes the two crashes the same.  Since no increased crash rate was observed in Mojave WK2, it will not affect Safari updates.