From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 9EB3846C45; Tue, 29 Jul 2025 23:46:18 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 5EA9740653; Tue, 29 Jul 2025 23:46:18 +0200 (CEST) Received: from mail-qk1-f171.google.com (mail-qk1-f171.google.com [209.85.222.171]) by mails.dpdk.org (Postfix) with ESMTP id 8ADCB4060F for ; Tue, 29 Jul 2025 23:46:16 +0200 (CEST) Received: by mail-qk1-f171.google.com with SMTP id af79cd13be357-7e2c1dc6567so385347585a.1 for ; Tue, 29 Jul 2025 14:46:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20230601.gappssmtp.com; s=20230601; t=1753825576; x=1754430376; darn=dpdk.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=6omSYdlIu4fkBCovVjTFG6zSJ8KMuawaiWODptZnUrg=; b=eoEs00dlVKLeUj6EaeBo11uD2xe8CFcKosBjyTYfjRtmBIHuoeFZizuEwjuMUDq4Tf R2276tbYDPvByGfa7ioazZ05I7bpS+0oHAHUAqx/MOSye8Unbmq/aeaXNnQPkxhCzACB T8X3rTN1d6AQfcl9STkhChilqFDGar0uq29pzznij1MHam2yw/XFcNXTu8P94z8cUuyT mJDn6gJj99hhgEfQ3y5bRJuJHeZQS9rGmxAuLX0fmxgEoamAnlyUgRbaYe8tg+0umjo/ LLNN+NH3ObC2aUk5hjnRmLERNErHN6Ii0NkezCucHR6kUBvDC5Kn7yAJtgIUzzKIdvcA Xyfg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1753825576; x=1754430376; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=6omSYdlIu4fkBCovVjTFG6zSJ8KMuawaiWODptZnUrg=; b=sloD2ZJqhoBYu/Rx0sLNMBrLt1on41qzyxa2WEKvl8vWN6jmhMQRqudN2TjjjSKoLV I+nk7ts+yk2mm4t1ev+9p7wBMQRFf3w/leMguIUixwENUAGWSuP4umM7b6+mExAGgcf8 iQs1IS0dM794v39juF9jvQ+peoKmrbdZ+x9SMNFRDJAt4Uauvo56uD1Wdhe8V1Uz0bVq WTuEbiHRiV+Wsv6s36Sy6QxP+tyd1OFxabxgz4EOZvIarCmgmHGJ1Z1aKPuzoN32VJTi oAEEMxLVMuHb4cW4Arvmq6J7OuuXZX2Dtxp4A4EJEsj/mqf8SkRjJ5FwODgipAV1mp7q V7NA== X-Gm-Message-State: AOJu0YyTSKbGdgf0lUBgcAkCtfFDR2JTqI2Q+j8HM7lpvvkpzngR9+qB x/5pYxvVPU/cDJMzhq8d0PZnp7wvoDZjWFk+4HsFcYasVc7/JbYGBn7wQ+/u8+UZGm4= X-Gm-Gg: ASbGnctiBHRrPPQAXQSI9+I/oMKC23F2/mY2XYyx8Vi4IMw1swWWXxa38xwE44IJRfF uwCbuPHcCG+TJE2ixPw3haTYlR+SFeRFPaFljZMtxvIXkYQIAX8/TlCz+H0Xd7llKOeyyTtrSxw Hgo6uMY9+MaLpdVu1NzrXVUoVCkT/Uw2qZXG7kLVLj5QupqKV4Nfnl7HSECh4SR65ULumgJhnJX giQMj/vLCwoLmmKWe7qDSJzNRwkrO4kXmRpVze7tQqrPSeGcosFOEyNs2D/fB7Q4uPg9CySxG9Y vqKD9mE+0CutTwUOvm2RllgnCv0F+LuzXcNL8ZgpfZNhdgSKsKXdeSzCdID0wKrfo9d3oKBzX4M hN+oonWze0Rc9WJZ4pq8CYaOxj+2fKbO0EZqMB5AZkewbd1Ilqs05htOtniZPcWJ+oVqDeSm2BL 4= X-Google-Smtp-Source: AGHT+IH6xJJMaVu88cNWNIqSqx3wRN1CF9WaA1hv5CHNwg/aWKgJEBOSnaFOOKcTKYBbeUPpU+/qXQ== X-Received: by 2002:a05:620a:1727:b0:7e6:3168:ce58 with SMTP id af79cd13be357-7e66f3a6ba7mr202845685a.48.1753825575814; Tue, 29 Jul 2025 14:46:15 -0700 (PDT) Received: from hermes.local (204-195-96-226.wavecable.com. [204.195.96.226]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7e64387a19csm483058685a.61.2025.07.29.14.46.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Jul 2025 14:46:15 -0700 (PDT) Date: Tue, 29 Jul 2025 14:46:11 -0700 From: Stephen Hemminger To: Khadem Ullah <14pwcse1224@uetpeshawar.edu.pk> Cc: dev@dpdk.org, rasland@nvidia.com, stable@dpdk.org Subject: Re: [PATCH] net/mlx5: fix crash when secondary queries dev info after primary exits Message-ID: <20250729144611.46078d65@hermes.local> In-Reply-To: <20250721073851.963141-1-14pwcse1224@uetpeshawar.edu.pk> References: <20250721073851.963141-1-14pwcse1224@uetpeshawar.edu.pk> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org On Mon, 21 Jul 2025 03:38:51 -0400 Khadem Ullah <14pwcse1224@uetpeshawar.edu.pk> wrote: > When the primary process exits, the shared mlx5 state becomes > unavailable to secondary processes. If a secondary process attempts > to query device information (e.g., via testpmd), a NULL dereference > may occur due to missing shared data. > > This patch adds a check for shared context availability and fails > gracefully while preventing a crash. > > Fixes: e60fbd5b24fc ("mlx5: add device configure/start/stop") > Cc: stable@dpdk.org > > Signed-off-by: Khadem Ullah <14pwcse1224@uetpeshawar.edu.pk> > --- NAK As per other thread. Drivers need not worry about this. If secondary gets to this point it is using freed bus and device information and nothing is valid.