Re: [REGRESSION] 9pfs issues on 6.12-rc1

[Dominique Martinet <asmadeus@codewreck.org>]

asmadeus@codewreck.org wrote on Mon, Aug 11, 2025 at 09:57:51AM +0900:
> Also I haven't been able to reproduce it with a kernel I built myself/my
> environment, but it reproduces reliably 99% of the times in the nixos
> VM, so we're missing a last piece for a "simple" (non-nix) reproducer,
> but I think it's good enough for me to dig into this;

(okay, I got this to work wedging my kernel into the nixos initrd; this
requires the iov to be built off non-contiguous pages and so having
systemd thrash around was apparently a required step...)

So that wasn't a 9p bug, I'm not sure if I should be happy or not?

I've sent "proper-ish" patches at [1] which most concerned people should
be in Cc; I'm fairly confident this will make the bug go away but any
testing is appreciated, please reply to the patches with a Tested-by if
you have time.

[1] https://lkml.kernel.org/r/20250811-iot_iter_folio-v1-0-d9c223adf93c@codewreck.org


Thank you all again, and sorry I haven't had the time to look further
into this without a clean reproducer, this really shouldn't have taken
that long...
-- 
Dominique Martinet | Asmadeus