[Webkit-unassigned] [Bug 220889] JIT support for SSE4a

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220889

Jeff Fortin <nekohayo at gmail.com> changed:

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                 CC|                            |nekohayo at gmail.com

--- Comment #7 from Jeff Fortin <nekohayo at gmail.com> ---
Indeed I do have access to such hardware for testing* because my parents have a desktop computer running Fedora 38 with an AMD Phenom™ 9600B quad-core processor that otherwise runs pretty well. Wikipedia tells me the AMD Phenom II series also have this same sort of limitation.

While testing, I was able to confirm that running with "JavaScriptCoreUseJIT=0" avoided the crash.

To reproduce on my end (with those CPUs), with WebKitGtk's "MiniBrowser" or with Epiphany, it's as simple as clicking on any link to a PDF file on the web; as the browsers will try to open it with the built-in pdf.js viewer by default, it will trigger a crash 100% of the time because it tries to use "roundsd".

A side-effect of such crashes is that the system can then become unresponsive because preinstalled tools like systemd-coredump automatically try to catch, compress and store (and possibly further process) the crashes every time, which can lead to a lot of I/O, CPU and disk usage, and overall lack of responsiveness of the system while the user is trying to use it, and it's not immediately obvious that it crashed behind the scenes.

*: presuming I can use some sort of prebuilt package to test ideally, because I don't think I would be able to compile WebKit by myself on that machine with 4 GB of RAM ;)

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