Bug 225126 – [Stress Tests EWS] WPT tests failing in `run-layout-tests-in-guard-malloc-stress-mode`

• Status: NEW
• Component: Tools / Tests

[Ryan Haddad]

It appears that whenever stress tests EWS runs the `run-layout-tests-in-guard-malloc-stress-mode ` step for tests in the imported/w3c/web-platform-tests directory, the wptwk server isn't started, which causes the tests to fail

Example build showing a WPT test passing in the `run-layout-tests-in-stress-mode` step, but failing in in the `run-layout-tests-in-guard-malloc-stress-mode` step:
https://ews-build.webkit.org/#/builders/62/builds/1853

Test result showing the test failing with a render tree dump for about:blank: 
https://ews-build.s3-us-west-2.amazonaws.com/macOS-Release-WK2-Stress-Tests-EWS/r427118-1853-guard-malloc/results.html

[Radar WebKit Bug Importer]

<rdar://problem/77236114>

[Ryan Haddad]

The `run-layout-tests-in-stress-mode` test run is indeed starting wptwk, as seen in the logs (and the fact that the test passes in that mode)
https://ews-build.webkit.org/#/builders/62/builds/1853/steps/14/logs/stdio

The only difference for the `run-layout-tests-in-guard-malloc-stress-mode ` step is the addition of `--guard-malloc`, so maybe something is broken in `run-webkit-tests` itself?

[Jonathan Bedard]

(In reply to Ryan Haddad from comment #2)
> The `run-layout-tests-in-stress-mode` test run is indeed starting wptwk, as
> seen in the logs (and the fact that the test passes in that mode)
> https://ews-build.webkit.org/#/builders/62/builds/1853/steps/14/logs/stdio
> 
> The only difference for the `run-layout-tests-in-guard-malloc-stress-mode `
> step is the addition of `--guard-malloc`, so maybe something is broken in
> `run-webkit-tests` itself?

Very strongly suspect that is the case. It's also probably a very easy fix. I'll take a look tomorrow.

[Ryosuke Niwa]

I've seen regular layout test step reproducing the same issue too.

[Jonathan Bedard]

This seems to be about guard-malloc specifically, not a general problem with all invocations of run-webkit-tests.

[Jonathan Bedard]

We are starting the WPT server in guard-malloc mode, seems like the web-platforms tests may be genuinely timing out.