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Mon, 12 Feb 2024 08:37:51 -0800 (PST) X-Forwarded-Encrypted: i=1; AJvYcCUvhfQXfdjCcDXB8aaOKwxxGevTR0Rtgn4O+/rzl3T20iPgRrITZnKG2CuwePyU03X7s7EyTuIsSGfGB+Ibo0PqesMGFgZTHDU+yrHfUNXXjHArOJzLCZkJX+eaAfTOgILwHGgoRW3887SUurmmIbG6wXqfRLgZTNilUpAiUY1YLJglKf8nsDq5+ew6J5/MzPNfoCJ20LWMielpmEOB Received: from smtpclient.apple ([2601:6c1:500:2c60:2ca9:3984:5abb:843a]) by smtp.gmail.com with ESMTPSA id r24-20020a0568080ab800b003c032640de1sm110834oij.47.2024.02.12.08.37.50 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 12 Feb 2024 08:37:51 -0800 (PST) Content-Type: text/plain; charset=utf-8 Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3774.300.61.1.2\)) Subject: Re: Segfault in mlx5 driver on infiniband after application fork From: Kevan Rehm In-Reply-To: <20240212161238.GF765010@ziepe.ca> Date: Mon, 12 Feb 2024 11:37:39 -0500 Cc: Mark Zhang , Leon Romanovsky , "linux-rdma@vger.kernel.org" , Yishai Hadas , kevan.rehm@hpe.com, chien.tin.tung@intel.com Content-Transfer-Encoding: quoted-printable Message-Id: <0BC5DF9E-53A2-4224-8EDE-87B4F2407D56@gmail.com> References: <3CAF66C4-32E1-4258-9656-D886843D7771@gmail.com> <20240212133303.GA765010@ziepe.ca> <8BB93F6F-14EC-4B43-B1F0-5FE185A64073@gmail.com> <20240212144013.GD765010@ziepe.ca> <53992378-7BB2-4E8C-BD3F-8A2B1FC837BD@gmail.com> <20240212161238.GF765010@ziepe.ca> To: Jason Gunthorpe X-Mailer: Apple Mail (2.3774.300.61.1.2) > On Feb 12, 2024, at 11:12=E2=80=AFAM, Jason Gunthorpe = wrote: >=20 > On Mon, Feb 12, 2024 at 11:04:36AM -0500, Kevan Rehm wrote: >=20 >> Those routines call ibv_dontfork_range on the page after it=E2=80=99s = been >> allocated via posix_memalign(). _add_page() then adds the new page >> to the mlx5_context field dbr_available_pages. >=20 > Oh, if this is your trouble then upgrade your kernel. This part is > fixed on kernels that have working fork support. That=E2=80=99s the bit that confuses me; all this is happening in user = space, what is different in the kernel that would prevent this problem = from occurring in user space? Any guess as to how much newer a kernel = must be? >=20 > Jason