Re: Bug across major branches, advice for bisecting and contributing

[Siddh Raman Pant]

On Sat, 14 Sep 2024 08:03:29 +0530, James young wrote:
> 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.



You can reduce number of commits by looking at fs/smb for a start.


Though depending on the repro you can narrow down further.


Best bet would be to trace the repro on 6.6 to find problematic code.


Thanks,
Siddh