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[24.31.253.228]) by smtp.gmail.com with ESMTPSA id g6-v6sm877497otj.57.2018.06.27.22.05.08 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 27 Jun 2018 22:05:08 -0700 (PDT) To: Matthew Wilcox , "Kirill A. Shutemov" , Vlastimil Babka , Christoph Lameter , Dave Hansen , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Lai Jiangshan , Martin Schwidefsky , Pekka Enberg , Randy Dunlap , Andrey Ryabinin , Andrew Morton , Linus Torvalds , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman From: Larry Finger Cc: linuxppc-dev@lists.ozlabs.org, LKML Subject: Regression in 4.18 - 32-bit PowerPC crashes on boot - bisected to commit 1d40a5ea01d5 Message-ID: <5a98ad6b-e209-a9dc-98db-1745ef5b7f87@lwfinger.net> Date: Thu, 28 Jun 2018 00:05:07 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 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 My PowerBook G4 Aluminum crashes on boot with 4.18-rcX kernels with a kernel BUG at include/linux/page-flags.h:700! The problem was bisected to commit 1d40a5ea01d5 ("mm: mark pages in use for page tables"). It is not possible to capture the bug with anything other than a camera. The first few lines of the traceback are as follows: free_pgd_range+0x19c/0x30c (unreliable) free_pgtables_0xa0/0xb0 exit_pmap+0xf4/0x16c mmput+0x64/0xf0 do_exit+0x33c/0x89c oops_end+0x13c/0x144 _exception_pkey+0x58/0x128 ret_from_except_full+0x0/0x4 --- interrupt: 700 at free_pgd_range+0x19c/0x30c LR = free_pgd_range+0x19c/0x30c free_pgtables+0xa/0xb exit_mnap+0xf4/0x16c mmput+0x64/0xf0 flush_old_exec+0x490/0x550 I have a PDF of the complete dump, but I hesitate to send this to the entire group. Thanks, Larry