From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.yourmailgateway.de (relay.yourmailgateway.de [188.68.63.166]) (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 68D88492513; Wed, 7 Oct 2026 10:44:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=188.68.63.166 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791369875; cv=none; b=gmAYsl6MuvlhQZn98ACMxC2oNv476Ff7ArnhSd8O7hCEzTDKcJj+/ZIp4HQow0QOIResiUM+YZLsNmV320NuIiVxpfA07DYBN7NVhEySybalHAnUaxzb5Mqpx/xAdvjy3nr/n/okg2VN9DI/fDgh4eHs/JD1RpUv7cZHsTSEDPU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791369875; c=relaxed/simple; bh=XUI4IBT1AHM+WS8afOBXSDy1+qMEJ7pG3D6us0CT6UU=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=rp/tWnGkWQqwAcOyeDnSFhFT9cwt9rszebFJGRUW7EfFongT2/FGddnFfdJdlWtFdrxpxbsmIM0A5ep7qXLwNlSeW89YlGzjuyEuZsxE/J+NEFdxxozQYtv99cV9r8cMwBNtMxpu4sqCPst6B5uadQbcV5DArBdHyPd3AKdENEY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=leemhuis.info; spf=pass smtp.mailfrom=leemhuis.info; dkim=pass (2048-bit key) header.d=leemhuis.info header.i=@leemhuis.info header.b=aubZZp6H; arc=none smtp.client-ip=188.68.63.166 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=leemhuis.info Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=leemhuis.info Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=leemhuis.info header.i=@leemhuis.info header.b="aubZZp6H" Received: from mors-relay-8202.netcup.net (localhost [127.0.0.1]) by mors-relay-8202.netcup.net (Postfix) with ESMTPS id 4j08c06C9Bz3ypX; Wed, 7 Oct 2026 12:33:36 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=leemhuis.info; s=key2; t=1791369216; bh=XUI4IBT1AHM+WS8afOBXSDy1+qMEJ7pG3D6us0CT6UU=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=aubZZp6HY1K4YPD3VvN/i5tMA47ouI7WJTsOh28rWzjH41zNSBpYq2fZlCnh3tjjs V/iLSfqreDhYcW4W4agWUQ5Watt9bs939oAmM41/Nh3Vxm5K5ymB0mQncUqg3Ncr8o C7V0bNpc401DdeR96o9n4W8y38xbHTTqdBw/e8tLoI38wdkFpuq4KjDj230pPn5QQk yKOB7Z02AGUYMQ4+1s7RyktG2uZ/1EUKqa27m2YWO41Q3mdHwxQBBRbRh86gyMEiT7 oCis8T7Yj/clA+Sx9Mt6QcsY+3z2vm9HRC8tPXga4jlTCI/3cGk+vOxfGdgeHTvWlG Jalh5UjN1FUUw== Received: from policy02-mors.netcup.net (unknown [46.38.225.35]) by mors-relay-8202.netcup.net (Postfix) with ESMTPS id 4j08c05V4Nz3ynm; Wed, 7 Oct 2026 12:33:36 +0200 (CEST) Received: from mxe9fb.netcup.net (unknown [10.243.12.53]) (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) by policy02-mors.netcup.net (Postfix) with ESMTPS id 4j08bz5ybqz8svJ; Wed, 7 Oct 2026 12:33:35 +0200 (CEST) Received: from [192.168.142.51] (90-182-211-1.rcp.o2.cz [90.182.211.1]) by mxe9fb.netcup.net (Postfix) with ESMTPSA id 125485FA36; Wed, 7 Oct 2026 12:33:35 +0200 (CEST) Authentication-Results: mxe9fb; spf=pass (sender IP is 90.182.211.1) smtp.mailfrom=regressions@leemhuis.info smtp.helo=[192.168.142.51] Received-SPF: pass (mxe9fb: connection is authenticated) Message-ID: Date: Wed, 7 Oct 2026 12:33:34 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [REGRESSION] Commit 447cbe95ebb9 causes IOMMU DMA faults on macvlan/vlan with bnxt_en To: Sasha Levin , Eric Dumazet , =?UTF-8?Q?Fabian_Gr=C3=BCnbichler?= Cc: Michael Chan , Joe Damato , netdev@vger.kernel.org, Pavan Chebbi , regressions@lists.linux.dev, stable@vger.kernel.org, Stefan Fleischmann References: <20261005145430.12777c2c@nargothrond> <2026-10-06-1-daily-reply-0020-bnxt-en-vlan-447cbe95@kernel.org> From: Thorsten Leemhuis Content-Language: de-DE, en-US In-Reply-To: <2026-10-06-1-daily-reply-0020-bnxt-en-vlan-447cbe95@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-PPP-Message-ID: <179136921539.2615039.13155272119453694887@mxe9fb.netcup.net> X-NC-CID: 3D5EpOl4fJDoODSbkXR/FVrrWtWpL+c30msiSWuHHrO1kgcezxQ= On 10/6/26 23:35, Sasha Levin wrote: >> I'm testing the patch on v6.18.55, and it looks good so far. 5 hours and >> counting without any issues. > > Thanks for the bisect. The root cause is the bnxt_en small-packet padding > and DMA length bug Eric Dumazet identified, not 447cbe95ebb9 ("vlan: fix > skb_under_panic and races when toggling HW VLAN offload") itself, so we > will not revert the vlan fix. Once Eric's "bnxt_en: fix DMA mapping length > for padded small packets" lands in mainline, we will backport it to all > affected stable trees. FWIW, better wait a little longer till a fix for another regression 447cbe95ebb9 exposed in another driver is fixed, too: https://lore.kernel.org/all/CAPa5EdCj3v17tB-SF2JNecq5Q8s1Pranr-XzAFWNpNTBPgPG7w@mail.gmail.com/ Ciao, Thorsten