From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f178.google.com (mail-pl1-f178.google.com [209.85.214.178]) (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 6A1EA3F88BE for ; Tue, 25 Aug 2026 15:43:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787672584; cv=none; b=Jq7jya0C8L6ir1JIo7IRImINqRvJlrUYBfKCgarz5TXcs+rQdskLMFkXLkM6xO6t4zCaE0k8YgQeuRXMPPUAc4Kl5NYdD1Pc7sHnQdHxuIOYavF+rVX9UpWCkWyxRji6T80ZjoQiXJOxsQijgdMz53Jfc5P6cYtVMxHvkvKOxHM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787672584; c=relaxed/simple; bh=fhiQy2OV+cVozCzA7BSCdsrQ7zEt4QGoeZmCdVvGFro=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=cgS+pdXVJ6I/uNeEPAWpLKI7fGLodojFWJ2gEynqyLes76aez6s09dwZXSMMp61tsXADl5R1gWsg3YFl4d4QMhmdB0e64MG1RYwHN3QKzZLO7/EVIrr9KeHbw08eNxzSHtc4m24WduhdWcWA822H27d/y2sHVRiECMQH80L7ImI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Ckt1bpky; arc=none smtp.client-ip=209.85.214.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Ckt1bpky" Received: by mail-pl1-f178.google.com with SMTP id d9443c01a7336-2d6f55a7089so9139695ad.3 for ; Tue, 25 Aug 2026 08:43:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1787672583; x=1788277383; darn=vger.kernel.org; h=content-transfer-encoding:content-type:mime-version:references :in-reply-to:message-id:date:subject:cc:to:from:from:to:cc:subject :date:message-id:reply-to:content-type; bh=fhiQy2OV+cVozCzA7BSCdsrQ7zEt4QGoeZmCdVvGFro=; b=Ckt1bpkyFwWg1EvlI4uGlY8G3cO5IES3FcAaseE44jO/8wvNJRGpwCJ/bUhmomKDae 5H0y5nVG7xbzwrp+HTQ5D5RSvGUiahAe0MNj0+CEveTo5fsk6gLQ2+RRBvbplSDIQFgK 2dwSBuRurkY9zNB7LIIPSqfzIPndlcsktWFtYoudJxyWD2LSsXYfHw3Gk734Pz73Jurp obFoxpNWbWqpY/0ivjSFDW1H7aWdPZkyf6ohg6ahxmSUzpO1S+Gzx2aF1x5Jfzflprfz aSOhsxOJ6B4yh0Dp12NOdMueW0ujNLVYSf//tPB0ssYEOsPdC2jhHlfQ0H5qrsZ+udmF reqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787672583; x=1788277383; h=content-transfer-encoding:content-type:mime-version:references :in-reply-to:message-id:date:subject:cc:to:from:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=fhiQy2OV+cVozCzA7BSCdsrQ7zEt4QGoeZmCdVvGFro=; b=q2PnEe0IAv2mVdnNeWLnR/9ohjFLdVV5nKoguFhfm+gJcB2iDbAS+OAo/qEq8OmBvD IXZEgsZDWzTa6YCmepXXObR3qsWuQ4TFRJHVdM2W0DvHl2ZGybKQo8qeAEGwrU+n7qiL vSL9Cl+Pwj2pDUzb+uz03oWs5NhUhSKasGOCxujIRXN/FX4ZGFEdZQSIccy/nnGe3Lps ANMod0twXhXNaku8ejvKRNLheBdvh6R6BxDK43Z82av/fFKK1wwmxCMz1BCh2KbvyDgX NCfk2KeXffKaQr/DJLHxhRIDCX1aiLoWX/8V0fa7Wy78My8Fs+nbzBTOsEVooPRxpb3Z /5NQ== X-Forwarded-Encrypted: i=1; AHgh+RrRjQ2Tn4YEUSXkxjGST82Ktz2wpf+dbCYJ6//0GVu8ChYNbNHjWVtpYoEK89yK2urWF+5pclFD/heHTdE=@vger.kernel.org X-Gm-Message-State: AFuF++kyd61WYYEbG9KsUpaomyk0vTrDzZSd2FxCl76saBIyLK4fuLsJ R4Va6r8+eRlRGnzjE1xFbEeiUFAAvWeMCCsZ89cphkzf5YTlpU5NVng5 X-Gm-Gg: AR+sD13kzACc+OUEB045RlkWYRh5iw7Aex9NuJZnflUUiB0gBtPAZkp+Zu2h52IeyO3 lWTLttMSdD90txzDu2JTkdiG+40UswM7MT2C2jQZDoA7oHLt2ikOia9rrPHVwkoJRhYhnPyxKsI SNJHPzbSa5sWmbIGs6DWrZOKjLd4nodeNRAxAfuGgdoSb8IhBLKOwCey4cHb7BV5qaQXhSw28Zc Mp80nge9kFAw7cLKL9ay9meMf2wCScELQIXOh0Ed3dDRUCWUogpS4OGxFwE8FQCbmtYmwEc4rrp PMlM0IgWROIPefUUCmIiCftPjJ9tYKZGULvgPXApOfeu/+ravPQociZyhT14I3XGASqTh5eETXS Cg5YF2TkGM3YNnG6q84BaTUaOCXG6I8gY+U2/ozPXxoKDtdoZ8jIqet4/QwlvbQKt8JxCtgAA7n ztPj1XWxB8E0nkKaAuDGCQI/c8hnmSv0Nk9hGKxn7HhDQHpD6Erg/3M16ocJJ4wsMMKkXthyhpb D4ndgK1PvVWKCRxSw== X-Received: by 2002:a17:902:e803:b0:2c9:df1b:e948 with SMTP id d9443c01a7336-2d670bb0a3dmr468059675ad.4.1787672582533; Tue, 25 Aug 2026 08:43:02 -0700 (PDT) Received: from localhost.localdomain ([103.210.91.43]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-327f90c0a59sm46306748eec.9.2026.08.25.08.42.57 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 25 Aug 2026 08:43:01 -0700 (PDT) From: Khawar Ahemad To: daniel@iogearbox.net Cc: bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, magnus.karlsson@intel.com, maciej.fijalkowski@intel.com, sdf@fomichev.me, ast@kernel.org, kuba@kernel.org, pabeni@redhat.com, syzbot+aa48b5fe7bfda62d1682@syzkaller.appspotmail.com Subject: Re: [PATCH bpf-next] xsk: Fix circular locking dependency in xsk_bind Date: Tue, 25 Aug 2026 21:12:54 +0530 Message-ID: <20260825154254.86328-1-ahemadkhawar123@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260825152152.86092-1-ahemadkhawar123@gmail.com> References: <20260825152152.86092-1-ahemadkhawar123@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi Daniel, Thank you for the quick review and pointer. You are completely right — I missed that xsk_notifier() calls xp_clear_dev() while holding xs->mutex, which acquires netdev_lock_ops() internally. Please drop this patch. I will step back and do a more thorough analysis of the full locking design between xs->mutex, net->xdp.lock, and xp_clear_dev(). Thanks, Khawar Ahemad