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Tue, 17 Oct 2023 04:05:50 -0700 (PDT) Date: Tue, 17 Oct 2023 12:05:49 +0100 From: Lorenzo Stoakes To: Sachin Sant Cc: linuxppc-dev , linux-mm@kvack.org, open list Subject: Re: [powerpc] Kernel crash while running LTP (bisected) Message-ID: <84a6c480-f29b-4a73-bbb0-4908145dc4db@lucifer.local> References: <81C9E2C1-DCC3-4DDD-8466-069893398B5B@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <81C9E2C1-DCC3-4DDD-8466-069893398B5B@linux.ibm.com> X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 412832001D X-Stat-Signature: unwkznnsck4ioeneybanf6pnwifwtr3a X-HE-Tag: 1697540753-136530 X-HE-Meta: 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 bVSH7dSE 9ekdqISs1ZllH+fRa0mlJqB7I3bbyBScBXc8SvSp+UbuVnWFPafnLE5HXN4R/Fsvyzy0NzxdGt+n6Ylo1E6JYoo/WtifDmb550zy7j92waowqHBaCXQaKJydvdJyE2pML9I9DJSWbX2GUBeeCPueTSWPi96bBVx36XbT3vXTm4E9mA/kF+hgpvahiuPNkP6wlNX/JCxgqXeJooRkoEwYqqJtw5SNAVJ/RtRstZ5k+hGBzSKDu4+SwV3SpiBLu+eLPd5IeR3L9JfwIl+Pe4YxR/H3M/24H5wZNzZ5K4sHOjJzxWCLYHahcQ4wsyb2rGsxcC5ZHnEOaIwkRqhhPUJy3j3tGw1RsJt61gENeA27pSNmQxlXhF5CWbdCFc81X21MrTwoCGD2sN09+WoEZO/bxu53jQn8dC65RZglNyV3OoE9+WOgfUCV1CuDkefi7ftoUmfv1ZwAiVYo0H6A= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000463, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Oct 17, 2023 at 02:46:07PM +0530, Sachin Sant wrote: > While running LTP tests (getpid02) on a Power10 server booted with > 6.6.0-rc6-next-20231016 following crash was seen: > > [ 76.386628] Kernel attempted to read user page (d8) - exploit attempt? (uid: 0) > [ 76.386649] BUG: Kernel NULL pointer dereference on read at 0x000000d8 > [ 76.386653] Faulting instruction address: 0xc0000000004cda90 > [ 76.386658] Oops: Kernel access of bad area, sig: 11 [#1] [snip] > > Git bisect points to following patch > > commit 1db41d29b79ad271674081c752961edd064bbbac > mm: perform the mapping_map_writable() check after call_mmap() > > Reverting the patch allows the test to complete. > > - Sachin Hi Sachin, Thanks for the report but this was triggered in another test previously and has been fixed already (apologies for the inconvenience!) see [0]. Andrew took the -fix patch and applied to mm-unstable, this should wend its way to -next in the meantime. [0]:https://lore.kernel.org/all/c9eb4cc6-7db4-4c2b-838d-43a0b319a4f0@lucifer.local/