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

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Message-Id: <9294e7ac-4a3f-4a48-8e3e-0659955bf165@app.fastmail.com>
Date: Mon, 11 Aug 2025 14:43:21 +0200
From: "Arnout Engelen" <arnout@...t.net>
To: "Dominique Martinet" <asmadeus@...ewreck.org>
Cc: ryan@...fa.xyz, antony.antony@...unet.com, antony@...nome.org,
 brauner@...nel.org, ericvh@...nel.org, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux_oss@...debyte.com, lucho@...kov.net,
 maximilian@...sch.me, netfs@...ts.linux.dev, regressions@...ts.linux.dev,
 sedat.dilek@...il.com, v9fs@...ts.linux.dev,
 "Matthew Wilcox" <willy@...radead.org>, dhowells@...hat.com
Subject: Re: [REGRESSION] 9pfs issues on 6.12-rc1

On Mon, Aug 11, 2025, at 02:57, asmadeus@...ewreck.org wrote:
> Arnout Engelen wrote on Sun, Aug 10, 2025 at 07:57:11PM +0200:
> > I have a smallish nix-based reproducer at [3], and a more involved setup
> > with a lot of logging enabled and a convenient way to attach gdb at [4].
> > You start the VM and then 'cat /repro/default.json' manually, and see if
> > it looks 'truncated'.
> 
> Thank you!!! I was able to reproduce with this!
>
> Anyway this is a huge leap forward (hopeful it's the same problem and we
> don't have two similar issues lurking here...), we can't thank you
> enough.

Great - that means a lot ;)

On Mon, Aug 11, 2025, at 09:43, Dominique Martinet wrote:
> So that wasn't a 9p bug, I'm not sure if I should be happy or not?

:D

> 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

Awesome!


Kind regards,

-- 
Arnout Engelen
Engelen Open Source
https://engelen.eu