Thought I'd just throw this out there as a heads-up to anyone running such hardware (any i?86 without SSE2 instructions) ...
After my distro updated the kernel to 5.15.63 recently, I found that my 32-bit box was hosed--kernel panic!
I proceeded to investigate. The problem was in some code (x86/speculation) introduced in version 5.15.60. Kernel devs got it sorted by release 64, but version 5.15, releases 60 through 63 (and 5.19, releases 1-5) are affected by this little snafu on the aforementioned hardware.
Fully fixed in kernel versions:
5.19.6, 5.15.64, 5.10.140, 5.4.213, and 4.19.258.
If anybody out there has experienced panics on such 32-bit systems, upgrading to one of the above kernels should preclude having to downgrade, which is where I was stuck for about a week.
