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[24.31.245.230]) by smtp.gmail.com with ESMTPSA id t24sm958048otp.69.2020.05.18.12.21.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 18 May 2020 12:21:04 -0700 (PDT) To: LKML From: Larry Finger Subject: Indicated kmemleak in msr_build_context() for Kernel 5.7.0-rc5 Message-ID: <9f1bb619-c4ee-21c4-a251-870bd4db04fa@lwfinger.net> Date: Mon, 18 May 2020 14:21:02 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On a system with an AMD FX-8320E Eight-Core Processor running kernel 5.7.0-rc5, I am seeing the following memory leak: localhost:~ # cat /sys/kernel/debug/kmemleak unreferenced object 0xffff88840ca02540 (size 64): comm "swapper/0", pid 1, jiffies 4294892775 (age 138786.084s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 04 10 01 c0 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<0000000005004530>] msr_build_context.constprop.0+0x32/0xbe [<00000000bb4e1265>] msr_save_cpuid_features+0x28/0x2c [<0000000011ec0f08>] pm_check_save_msr+0x2e/0x40 [<000000000cd50945>] do_one_initcall+0x46/0x220 [<00000000fd0d2fc9>] kernel_init_freeable+0x1c6/0x23f [<000000009f9b95ca>] kernel_init+0xa/0xfc [<000000000a571fca>] ret_from_fork+0x22/0x40 This is a "family 0x15" AMD CPU, thus MSR saving is needed during suspending. I believe this to be a false positive. The indicated memory allocation has been in the kernel since v4.5.0. Should a patch be sent to clear this false memory leak indication for systems with AMD processors? Larry