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[2603:8090:2005:39b3::100a]) by smtp.gmail.com with ESMTPSA id e3sm403155oow.34.2021.07.30.12.59.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 30 Jul 2021 12:59:45 -0700 (PDT) Sender: Larry Finger To: Greg Kroah-Hartman Cc: LKML , linux-staging@lists.linux.dev From: Larry Finger Subject: kernel BUG in new r8188eu Message-ID: <80042e9f-6811-38f3-010b-1c0951ba88db@lwfinger.net> Date: Fri, 30 Jul 2021 14:59:44 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Greg, When I unplug the USB device with the driver loaded, I get the following BUG and my laptop freezes: kernel: BUG: unable to handle page fault for address: ffffeb0200043248 kernel: #PF: supervisor read access in kernel mode kernel: #PF: error_code(0x0000) - not-present page The traceback points to a kfree() call. I do not understand this BUG. Can you explain what happens? I think I know how to avoid the BUG, but that might be at the expense of a memory leak. Thanks, Larry