From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9E0093AB288 for ; Tue, 6 Oct 2026 20:22:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.176 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791318163; cv=none; b=fE13+5VB3xSb6QaR1Lp3p7ioyftl5eVelhnelJGVmqFiLb0FzG2Kvw17tdjOMEGXkWmznWQD7oqJnLWOwbSlXrs/fdko11ClElyouerLeWeyRZwk4aZSbFT3Ed14GyFbXs+9ZvRtg0MnywxdZ4xOeWixcPNpctJ4W2KHPhaCaCI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791318163; c=relaxed/simple; bh=rFVmQtBwbpZ+hy0N7xXtfJlmmBXLIt2lrMAgZCV0ulc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=WG8ZJvJrg2ChnGbWa+xrwUyzHlu/nITLFv1H/1TMf1Hp3esfZwn8fTwrfigSzMV8xQYmk0Y4EpIsmO3bQh9DOtI39QSPCeKZreX/JZe5xsd1OHZkP61pGRyFZTau6fZF5eU1EQWjcSRgH8LnJxL4igTqLcfjJ1e/wWOaLv+Y794= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=dama.to; spf=none smtp.mailfrom=dama.to; dkim=pass (2048-bit key) header.d=dama-to.20251104.gappssmtp.com header.i=@dama-to.20251104.gappssmtp.com header.b=zw9DsipY; arc=none smtp.client-ip=209.85.214.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=dama.to Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=dama.to Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=dama-to.20251104.gappssmtp.com header.i=@dama-to.20251104.gappssmtp.com header.b="zw9DsipY" Received: by mail-pl1-f176.google.com with SMTP id d9443c01a7336-2e4985211ecso12434595ad.1 for ; Tue, 06 Oct 2026 13:22:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dama-to.20251104.gappssmtp.com; s=20251104; t=1791318161; x=1791922961; darn=vger.kernel.org; h=in-reply-to:content-disposition:content-type:mime-version :references:mail-followup-to:message-id:subject:cc:to:from:date:from :to:cc:subject:date:message-id:reply-to:content-type; bh=wZRugNV3JlfxpmndM4rEfelj2/GgiUCrdqXME/BjiTs=; b=zw9DsipYBEc6myITIhwFjiChOmZOjg7lm8TmnQTGywKW3Zt+OK4y6AaFUmdK9mmvMh 3wxlT9vOkntD/tHXyJktZ8C5p6YPuE1fcyj8lG0Pu+pqG43hOeeyt7u38j2BdDQkh8nX VcVCYCGj/oCUCDTDq/1Xhu/a5EAQHekW+m2MkzNUXrmOAUwLoXIoZefHAf0CCczCgBeY NYl4RiireUGBX4/w10KZ3gCRBQOwALZLlYMjiTfuK24Sr/cxLnpRDOHs679Cs9bLa+3+ 6v/IRgEu9047GCsQtM6IzsAel6HUj+flDTIkQ5BheXe55uLfxEPOQ3Ovz/7Cz1iI4Fwa Rc8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791318161; x=1791922961; h=in-reply-to:content-disposition:content-type:mime-version :references:mail-followup-to:message-id:subject:cc:to:from:date :x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=wZRugNV3JlfxpmndM4rEfelj2/GgiUCrdqXME/BjiTs=; b=VN1uZW/GousgdTMxqTDbVqGrxxqLsaEc4XwONCcxwD2VhYcWXKYNQobCxkmvPlnxHd WAfaPno7hdC6AJsoh0pwufoCLoDoC9P1Xt+STMU0650JW5i0VyjfTu4veLQK9nA9FQaM fd19BTtWpdflhnn0ps5nbWlg9W1ryL67jBUwwkfzUj+TQ9krwURz0s7ZzcO9g0VY4jWR B4swnMzVzzZm99F1EIw4asB7qbmry85ZeQCROwCos0xQMJNfdr2ScodmOUulGHs5NAAv 39NtCDF2DeUfhLcu9DiNFfoX6vQSomwzetXP58PvyJPME3UFJlaypSmrT+Em76vXq5GK A6pQ== X-Gm-Message-State: AFq9FYL5ZPyElkrq5r5Lz3InltcrAqH4kDowi4wM2a2ZJVPg9I7EipBg WkwKUAg+wn45tI+ywlAYRCVyjLfIfjZuQ/YsGqSZuisQAYWe0R8U+MmQ/FQkgTJ28jg= X-Gm-Gg: AYBFou2Xjco5XoAaAZtIyuRhFS7OokRN82LxQa+tRalUlKyFvdl70zFJKIv7fICO7dM 3hzd64Y5SoJ8htk94GETe3BGwh2fYljBgP4l9Qkfrr019Stdhu0/AaOs0Z9ClS1xKsahCUhBUwV m5Ug3g4DUz9I5NDg5c8bgFZfhi8LazyDukdszK/42MLVpNXSrn/DaXHAKKAmyIJoZeOXutv78v+ 4s4Jv+QrjcDykDKmx3c3rrMiQFoYAa/NxqoK0D7O2nh+/Qx+D2KomC53NqXrAJs1xiYAmJmdjct EVemTUGF9fvLhLDGYevku5IqTS5xERrpL7QjjKGap+KO8GMk/5zjNwX6EmdYTYC/PBdFqwk23MJ DJCuH9vs7aMI7djta0l5ShP4DtsccRrmHwvzHnXNoWuqwmI9mMW5PciPWVSWF0CxBHB/5ptFfE6 Eu6QT5RyrCtiTEJ+JP+FQmfE9vJKduk5pnpLjWljhqPDGzzB6rF/Rv/tBx9SzKDCx0fMUA5v3HP uPJPdtLELA= X-Received: by 2002:a17:902:ecc6:b0:2df:84e0:902f with SMTP id d9443c01a7336-2e6003b6918mr3976315ad.9.1791318160579; Tue, 06 Oct 2026 13:22:40 -0700 (PDT) Received: from localhost ([2a03:2880:2ff:3::]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2e604948613sm850485ad.63.2026.10.06.13.22.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Oct 2026 13:22:39 -0700 (PDT) Date: Tue, 6 Oct 2026 13:22:37 -0700 From: Joe Damato To: anmory Cc: netdev@vger.kernel.org, michael.chan@broadcom.com, pavan.chebbi@broadcom.com, linux-kernel@vger.kernel.org Subject: Re: [RFC net v4 0/4] bnxt_en: Make RING FREE more robust Message-ID: Mail-Followup-To: Joe Damato , anmory , netdev@vger.kernel.org, michael.chan@broadcom.com, pavan.chebbi@broadcom.com, linux-kernel@vger.kernel.org References: 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-Disposition: inline In-Reply-To: On Tue, Oct 06, 2026 at 04:43:42PM +0000, anmory wrote: > Hi Joe, > > we appear to be hitting a very similar issue to the one described in > this RFC on two Broadcom BCM57504 systems. > > One detail that may be particularly relevant is the ordering in our > reproductions: on both systems the AMD-Vi IO_PAGE_FAULT occurs before > the NETDEV WATCHDOG / TX timeout. > > We originally encountered the problem after updating from Debian > 6.12.107-1 to 6.12.111-1. BTW there was recently this patch [1] proposed by Eric which helps prevent a bug Stefan reported [2]. I am not sure whether the bug you are hitting is Eric's bug or the bug I am chasing. Other than explaining how you repro'd the issue, if you want to test Eric's patch you could apply his patch to v6.12.111 and see if the issue still occurs. If it stops, it's probably the bug Eric fixed and not the one I'm chasing :) but if it continues, it could be what I've been looking for and I'd really want to know how you reproduced it, please. [1]: https://lore.kernel.org/netdev/20261006042153.199444-1-edumazet@kernel.org/ [2]: https://lore.kernel.org/netdev/20261004122616.56714cbd@nargothrond/