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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org * Mark Brown [220824 20:34]: > On Mon, Aug 22, 2022 at 03:06:30PM +0000, Liam Howlett wrote: > > From: "Matthew Wilcox (Oracle)" > > > > Handle overflow checking in count_mm_mlocked_page_nr() differently. > > Our QA team found that since next-20220823 we're seeing a couple of test > failures in the check_mmap_options kselftest on arm64 platforms with MTE > that aren't present in mainline: > > # # FAIL: mprotect not ignoring clear PROT_MTE property > # not ok 21 Check clear PROT_MTE flags with private mapping, sync error mode and mmap memory > # # FAIL: mprotect not ignoring clear PROT_MTE property > # not ok 22 Check clear PROT_MTE flags with private mapping and sync error mode and mmap/mprotect memory Thanks. > > I bisected this using qemu[1] which landed on 4ceb4bca479d41a > ("mm/mprotect: use maple tree navigation instead of vma linked list"), > though I'm not 100% sure I trust the specific identification of the > commit I'm pretty confident it's at the very least in this series. I've > not done any analysis of the failure beyond getting this bisect result. > > [1] qemu -smp cpus=4 -cpu max -machine virt,gic-version=3,mte=on This helps a lot. I think your bisect is accurate: ... struct mmu_gather tlb; + MA_STATE(mas, ¤t->mm->mm_mt, start, start); start = untagged_addr(start); ... It looks like I search against the tagged address. I should initialize the state to 0 and mas_set(&mas, start) after untagging the address. I'll send out a patch once I have recreated and verified this is the issue. Cheers, Liam _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel