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To: "Nicholas Piggin" Cc: Subject: Re: BUG: Bad page map in process init pte:c0ab684c pmd:01182000 (on a PowerMac G4 DP) Message-ID: <20221212231714.266db119@yea> In-Reply-To: References: <20221130224402.15c0cf8b@yea> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-MBO-RS-ID: fcc2d3e4d5feb6b9343 X-MBO-RS-META: atq588pcju5ukzjcw9rehs9r3tjftaor X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 20A45180011 X-Stat-Signature: u9k891jt45quzpmsg1s159kxqm37b7pj X-HE-Tag: 1670883447-779656 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.004493, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, 12 Dec 2022 14:31:35 +1000 "Nicholas Piggin" wrote: > Have you run memtest on the system? Are the messages related to a > kernel upgrade? This and your KASAN bugs look possibly like random > corruption. About the time 5.4 was around I did not have such issues on the G4. Building stuff for hours natively or via distcc just went fine. So I suspect there is a flaw introduced in newer kernel versions. This memory corruption or part of it may be even here since kernel 5.10 if it's the same issue as https://bugzilla.kernel.org/show_bug.cgi?id=215389 But actually running memtest is a very good idea. Just to be sure I am not hunting ghosts. > Although with that KASAN one it's strange that kernfs_node_cache > was involved both times, it's strange that page tables are pointing > to that same slab memory. It could be a page table page use-after > -free maybe? Maybe with the page table fragment code. I'm sure other > people would have hit that before though, so I don't know what to > suggest. Does not necessarily need to be the case other people have experienced this issue. This G4 DP setup is a bit unusually as it runs 2 x G4 CPUs and I doubt there is much multicore testing done on ppc32. ;) A few issues I reported (and Christophe thankfully ironed out) originated from here. Next I'll check out a known good 5.4 LTS kernel and see what memtester (https://pyropus.ca./software/memtester/) tells me. Regards, Erhard