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Mon, 16 Oct 2023 09:32:02 -0700 (PDT) Received: from localhost ([2a00:23c5:dc8c:8701:1663:9a35:5a7b:1d76]) by smtp.gmail.com with ESMTPSA id n9-20020adff089000000b0031ad2f9269dsm27451978wro.40.2023.10.16.09.32.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Oct 2023 09:32:01 -0700 (PDT) Date: Mon, 16 Oct 2023 17:32:00 +0100 From: Lorenzo Stoakes To: Naresh Kamboju Cc: open list , linux-mm , lkft-triage@lists.linaro.org, "Reviewed-by: Jan Kara" , Alexander Viro , Andy Lutomirski , Christian Brauner , Hugh Dickins , willy@infradead.org, Mike Kravetz , Muchun Song , Andrew Morton , Dan Carpenter , Arnd Bergmann Subject: Re: mm: Unable to handle kernel NULL pointer dereference at virtual address - mmap_region (include/linux/fs.h:580 mm/mmap.c:2946) Message-ID: <49bf8caa-e72e-406f-88d6-6d28aded078a@lucifer.local> References: <48534660-d5f7-45b2-8f99-19c8fb3e51c8@lucifer.local> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <48534660-d5f7-45b2-8f99-19c8fb3e51c8@lucifer.local> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 16, 2023 at 12:05:37PM +0100, Lorenzo Stoakes wrote: > On Mon, Oct 16, 2023 at 03:52:07PM +0530, Naresh Kamboju wrote: > > Following kernel crash noticed while running LTP hugetlb and selftests on > > qemu-x86_64 and qemu-arm64 running with Linux next 6.6.0-rc6-next-20231016. > > > > Reported-by: Linux Kernel Functional Testing > > Reported-by: Naresh Kamboju > > > > Test Logs: > > ----- > > [snip] > > > <4>[ 97.499871] Call trace: > > <4>[ 97.500288] mmap_region (include/linux/fs.h:580 mm/mmap.c:2946) > > OK this is from a patch of mine, and an easy fix (incorrect assumption about > vm->vm_file == file). > > I will put a fix forward tonight. > > > <4>[ 97.500814] do_mmap (mm/mmap.c:1379) > > <4>[ 97.501243] vm_mmap_pgoff (mm/util.c:546) > > <4>[ 97.501711] ksys_mmap_pgoff (mm/mmap.c:1425) > > <4>[ 97.502166] __arm64_sys_mmap (arch/arm64/kernel/sys.c:21) > > <4>[ 97.502634] invoke_syscall (arch/arm64/include/asm/current.h:19 > > arch/arm64/kernel/syscall.c:56) > > <4>[ 97.503175] el0_svc_common.constprop.0 > > (include/linux/thread_info.h:127 (discriminator 2) > > arch/arm64/kernel/syscall.c:144 (discriminator 2)) > > <4>[ 97.503763] do_el0_svc (arch/arm64/kernel/syscall.c:156) > > <4>[ 97.504191] el0_svc (arch/arm64/include/asm/daifflags.h:28 > > arch/arm64/kernel/entry-common.c:133 > > arch/arm64/kernel/entry-common.c:144 > > arch/arm64/kernel/entry-common.c:679) > > [snip] Have cc-d people in this thread on it, but for the record, -fix patch is at https://lore.kernel.org/all/c9eb4cc6-7db4-4c2b-838d-43a0b319a4f0@lucifer.local/