linux-kernel - Re: [V9fs-developer] KCSAN BUG report on p9_client_cb / p9_client

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Message-ID: <YNJQBc4dawzwMrhn@codewreck.org>
Date:   Wed, 23 Jun 2021 06:03:01 +0900
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     jim.cromie@...il.com
Cc:     kasan-dev@...glegroups.com, v9fs-developer@...ts.sourceforge.net,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [V9fs-developer] KCSAN BUG report on p9_client_cb / p9_client_rpc

Hi,

let's keep the lists in Cc :)

jim.cromie@...il.com wrote on Tue, Jun 22, 2021 at 02:55:19PM -0600:
> heres a fuller report - Im seeing some new stuff here.

Thanks, the one two should be the same as p9_client_cb / p9_client_rpc
and p9_client_cb / p9_virtio_zc_request are very similar, and also the
same to the first you had, so the patch didn't really work.

I thought after sending it that it probably needs to be tag =
READ_ONCE(req->tc.tag) instead of just assigning it... Would you mind
trying that?

> Im running in a vm, using virtme, which uses 9p to share host filesystems
> since 1st report to you, Ive added --smp 2 to my testing, it seems to
> have increased reporting

I'm ashamed to say I've just never tried KCSAN... I can give it a try over
the next few weeks* if that patch + READ_ONCE doesn't cut it

(*sorry)

Thanks,
-- 
Dominique