Kernel regression in 6.13

[Adam Stylinski <kungfujesus06@gmail.com>]

Hello,

I seem to be encountering a regression that prevents my system from booting.  The regression occurred between 6.12 and 6.13.  I've bisected it to this commit:
665745f274870c921020f610e2c99a3b1613519b

Some info about this system: it's ancient. It's a Q9650 that I used as a mythbackend/frontend for over a decade. This booting failure on newer kernels finally forced my hand to buy new a "new" PCI Express based tuner and upgrade the system into the modern age. It boots via MBR on a P45 based chipset (A P5Q Plus board, to be precise).  Given the age, I chalked the issue up to possibly some failing hardware or memory corruption that happened at compile time. I recently pulled the system back out again to do some performance testing in zlib-ng only to find out it hangs on the latest Ubuntu server ISO. I figured at this point it wasn't something specific to my kernel config / compilation and it's likely a regression. It's also old enough that I may be in the position of the only one having this problem, so I took it upon myself to bisect what was going on. Let me know if there's anything you'd like me to test or try.