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

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Message-ID: <1641293.1751018406@warthog.procyon.org.uk>
Date: Fri, 27 Jun 2025 11:00:06 +0100
From: David Howells <dhowells@...hat.com>
To: Ryan Lahfa <ryan@...fa.xyz>
Cc: dhowells@...hat.com, Antony Antony <antony.antony@...unet.com>,
    Antony Antony <antony@...nome.org>,
    Christian Brauner <brauner@...nel.org>,
    Eric Van Hensbergen <ericvh@...nel.org>,
    Latchesar Ionkov <lucho@...kov.net>,
    Dominique Martinet <asmadeus@...ewreck.org>,
    Christian Schoenebeck <linux_oss@...debyte.com>,
    Sedat Dilek <sedat.dilek@...il.com>,
    Maximilian Bosch <maximilian@...sch.me>, regressions@...ts.linux.dev,
    v9fs@...ts.linux.dev, netfs@...ts.linux.dev,
    linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] 9pfs issues on 6.12-rc1

Ryan Lahfa <ryan@...fa.xyz> wrote:

> Here is how to reproduce it:
> 
> $ git clone https://gerrit.lix.systems/lix
> $ cd lix
> $ git fetch https://gerrit.lix.systems/lix refs/changes/29/3329/8 && git checkout FETCH_HEAD
> $ nix-build -A hydraJobs.tests.local-releng

How do I build and run this on Fedora is the problem :-/

> [1]: https://gist.dgnum.eu/raito/3d1fa61ebaf642218342ffe644fb6efd

Looking at this, it looks very much like a page may have been double-freed.

Just to check, what are you using 9p for?  Containers?  And which transport is
being used, the virtio one?

David