[Webkit-unassigned] [Bug 230513] Broken pipes when writing to stdin of the server process on iOS simulator causing layout tests marked as crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230513

--- Comment #13 from ayumi_kojima at apple.com ---
I was able to reproduce the bug by the following steps:

1. Apply the attached patch locally that reverts all of the protection placed for the OSError exception. 

2. Run all tests using Python2 (python OpenSource/Tools/Scripts/run-webkit-tests --exit-after-n-crashes-or-timeouts 1000 --exit-after-n-failures 1000 --no-build --no-show-results --no-new-test-results --clobber-old-results --ios-simulator --debug --debug-rwt-logging --child-processes 8 ;sudo sysdiagnose -l)

3. Test run stops at around fast/css-intrinsic-dimensions. Observe many timed-out tests.

4. Run tests again using run-webkit-tests <same build> --ios-simulator fast

5. Receives stdout:

[1/12583] fast/check-layout-error-no-attributes.html failed unexpectedly (test timed out, no output from test)
[2/12583] fast/js-promise-from-detached-iframe.html failed unexpectedly (test timed out, no output from test)
[3/12583] fast/animation/animation-display-style-adjustment.html failed unexpectedly (test timed out)

OSError raised: [Errno 9] Bad file descriptor

...

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