This has been the case for quite some time according to the history, in the cases it does not time out it has failed with text failure. https://results.webkit.org/?suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2FWebCryptoAPI%2Fderive_bits_keys%2Fpbkdf2.https.any.worker.html&test=imported%2Fw3c%2Fweb-platform-tests%2FWebCryptoAPI%2Fderive_bits_keys%2Fecdh_bits.https.any.html&test=imported%2Fw3c%2Fweb-platform-tests%2FWebCryptoAPI%2Fderive_bits_keys%2Fecdh_bits.https.any.worker.html&test=imported%2Fw3c%2Fweb-platform-tests%2FWebCryptoAPI%2Fderive_bits_keys%2Fecdh_bits.https.worker.html&test=imported%2Fw3c%2Fweb-platform-tests%2FWebCryptoAPI%2Fderive_bits_keys%2Fecdh_keys.https.any.html&test=imported%2Fw3c%2Fweb-platform-tests%2FWebCryptoAPI%2Fderive_bits_keys%2Fecdh_keys.https.any.worker.html&test=imported%2Fw3c%2Fweb-platform-tests%2FWebCryptoAPI%2Fderive_bits_keys%2Fecdh_keys.https.worker.html&test=imported%2Fw3c%2Fweb-platform-tests%2FWebCryptoAPI%2Fderive_bits_keys%2Fhkdf.https.any.html&test=imported%2Fw3c%2Fweb-platform-tests%2FWebCryptoAPI%2Fderive_bits_keys%2Fhkdf.https.any.html%3F1-1000&test=imported%2Fw3c%2Fweb-platform-tests%2FWebCryptoAPI%2Fderive_bits_keys%2Fhkdf.https.any.html%3F1001-2000&test=imported%2Fw3c%2Fweb-platform-tests%2FWebCryptoAPI%2Fderive_bits_keys%2Fhkdf.https.any.html%3F2001-3000
Created attachment 456849 [details] [fast-cq] Patch
Committed r292495 (249343@main): <https://commits.webkit.org/249343@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 456849 [details].
<rdar://problem/91370665>