From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp-5.sys.kth.se (smtp-5.sys.kth.se [130.237.48.130]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 338354519A2; Sun, 4 Oct 2026 14:35:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=130.237.48.130 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791124541; cv=none; b=D98M6FnbW7xsBdmWEqUgGxgSJUZzrag0VQnpcctN12GBWM+AXVo/8+LhodxCIbCJvt7y54d6ziGU5YhPf6do5xOz6PKls70SpJdcYewVmTS27QY8OxzF2uoykiSdptLdpoCxveaz1xKALYc9k/gYQb8xQq20RSwiy7P9jOHf8vg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791124541; c=relaxed/simple; bh=M1oTNlB/p3KI8hvVPYtrCmshRpJ/mJtloQQQucRUoc8=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=VHNDca74Gqbm+SxuIWgMT0cQ5RThN0I6utRX/RNmD2GPrJiFVN1sMtZMdGjIX17gXnoFIbZBEi05ZNrwJIDbFxoujdcPb8BQ8CG8TwMizQ7S4+BTPLbExEgeLY3pRB/nbYW0gEtc8RHiQwChcDXoQXzoyBiOK8XIDFBic2Yhbvs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=kth.se; spf=pass smtp.mailfrom=kth.se; dkim=pass (1024-bit key) header.d=kth.se header.i=@kth.se header.b=hrt0BD0d; arc=none smtp.client-ip=130.237.48.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=kth.se Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kth.se Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=kth.se header.i=@kth.se header.b="hrt0BD0d" Received: from nargothrond (c213-100-197-198.bredband.tele2.se [213.100.197.198]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: sfle) by smtp-5.sys.kth.se (Postfix) with ESMTPSA id 4hyQ6Y01zyzPNPw; Sun, 4 Oct 2026 16:35:32 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp-5.sys.kth.se 4hyQ6Y01zyzPNPw DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kth.se; s=default; t=1791124533; bh=lrgdVqGTcvAZg2IddQq+bm33rQHG+7FiKg2IzhyG5Fs=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=hrt0BD0d7TmOj7lRkTZgBI6uYfCKCxP+RO8yFqjGBHbRs9cQDF+/CT5N5+EWyKSBL sqH+wXwKSB/jmnwHpaAS6393ud/NXXyz/hNKgwtIFmawE/sfbtxAGq1PutlJG7TCpO GMeGEa7hRhzwiHntjOs3oHOvOK88Mr5AQWc9AiFg= Date: Sun, 4 Oct 2026 16:35:32 +0200 From: Stefan Fleischmann To: Eric Dumazet Cc: netdev@vger.kernel.org, stable@vger.kernel.org, Michael Chan , Pavan Chebbi , regressions@lists.linux.dev, Joe Damato Subject: Re: [REGRESSION] Commit 447cbe95ebb9 causes IOMMU DMA faults on macvlan/vlan with bnxt_en Message-ID: <20261004163532.3134dd41@nargothrond> In-Reply-To: References: <20261004122616.56714cbd@nargothrond> Organization: KTH X-Mailer: Claws Mail 4.4.0 (GTK 3.24.52; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Sun, 4 Oct 2026 13:46:08 +0200 Eric Dumazet wrote: > > Notice that 0xfc499000 is on an exact 4KB page boundary. This points > to a DMA read overrun where the Broadcom DMA engine reads past the > end of a buffer mapped in page 0xfc498xxx into the adjacent unmapped > page 0xfc499000. > > Have you tried a recent net kernel ? Hi Eric, that might be a bit tricky. We use ZFS on this server and the version we have installed only supports up to kernel 7.2. > Could you please test whether disabling TSO or hardware VLAN offload > prevents the crash? (maybe adding one option at a time) > > # ethtool -K eno1np0 tso off > > # ethtool -K eno1np0 tx-vlan-offload off I tested this now and none of these options made a difference. I've also tested disabling other offloads, no difference. Best, Stefan > Adding Joe to this thread, because some parts in > tso_dma_map_init() or tso_start() might have bugs. > > # Disable USO on the physical interface > ethtool -K eno1np0 tx-udp-segmentation off > > This reminds me on a prior attempt I made months ago to sanitize > tso_start() > > Note that my email address has changed to edumazet@kernel.org > > Thanks. >