Bug across major branches, advice for bisecting and contributing

[james young]

I've hit an odd CIFS corruption issue, in certain contexts, on ARM,
dependent on the Linux kernel version. I have a repeatable test. It
looks like:

* Debian 11, bullseye, kernel 6.1: ok

* Debian 12, bookworm, kernel 6.6: impacted

* v6.10, that I compiled: ok

I think I need to be *far* more specific before I go to the main
kernel mailing list or report a regression.

I'm planning to test the mainline kernel, though I haven't noted
significant differences from what Debian distributed. What's most
useful here?
* bisecting what broke between 6.1 and 6.6 - about 88k commits

* bisecting the fix between 6.6 and 6.10 - about 66k commits

* survey the major branches - 6.1, 6.2, ... 6.10
- my current WIP
Each iteration can take hours, and these aren't fully unattended, so,
I can't be too extensive, here.

Any thoughts or suggestions?

-James