linux-kernel - Re: arm64: allmodconfig: BUG: KCSAN: data-race in p9_client_cb / p9_client

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Message-ID: <CA+G9fYuJZ1C3802+uLvqJYMjGged36wyW+G1HZJLzrtmbi1bJA@mail.gmail.com>
Date:   Thu, 1 Dec 2022 13:13:25 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Dominique Martinet <asmadeus@...ewreck.org>
Cc:     Marco Elver <elver@...gle.com>, rcu <rcu@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        kunit-dev@...glegroups.com, lkft-triage@...ts.linaro.org,
        kasan-dev <kasan-dev@...glegroups.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Netdev <netdev@...r.kernel.org>,
        Anders Roxell <anders.roxell@...aro.org>
Subject: Re: arm64: allmodconfig: BUG: KCSAN: data-race in p9_client_cb / p9_client_rpc

On Thu, 1 Dec 2022 at 01:35, Dominique Martinet <asmadeus@...ewreck.org> wrote:
>
> Naresh Kamboju wrote on Wed, Nov 30, 2022 at 09:34:45PM +0530:
> > > > [  424.418214] write to 0xffff00000a753000 of 4 bytes by interrupt on cpu 0:
> > > > [  424.422437]  p9_client_cb+0x84/0x100
> > >
> > > Then we can look at git blame of the lines and see if it's new code.
> >
> > True.
> > Hope that tree and tag could help you get git details.
>
> Even with the git tag, if we don't build for the same arch with the same
> compiler version/options and the same .config we aren't likely to have
> identical binaries, so we cannot make sense of these offsets without
> much work.
>
> As much as I'd like to investigate a data race in 9p (and geez that code
> has been such a headache from syzbot already so I don't doubt there are
> more), having line numbers is really not optional if we want to scale at
> all.
> If you still have the vmlinux binary from that build (or if you can
> rebuild with the same options), running this text through addr2line
> should not take you too long.

Please find build artifacts in this link,
 - config
 - vmlinux
 - System.map
https://people.linaro.org/~anders.roxell/next-20221130-allmodconfig-arm64-tuxmake-build/

And

 # aarch64-linux-gnu-objdump -D vmlinux|less search for p9_client_cb

Attached objdump log and here is the link.
    - http://ix.io/4hk1

> (You might need to build with at least CONFIG_DEBUG_INFO_REDUCED (or not
> reduced), but that is on by default for aarch64)

Thanks for the suggestions.
The Kconfig is enabled now.
CONFIG_DEBUG_INFO_REDUCED=y

> --
> Dominique


- Naresh

View attachment "objdump-p9_client_cb.txt" of type "text/plain" (2530 bytes)