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Howlett" To: Bert Karwatzki Cc: Andrew Morton , Jiri Olsa , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-next@vger.kernel.org Subject: Re: commit 1c29a32ce65f4cd0f1c causes Bad rss-counter state and firefox-esr crash in linux-next-20240613 Message-ID: Mail-Followup-To: "Liam R. 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 MbUTm8PM WYLfqlKscXvXUcwDV2uZWUqvRoWFG36OmPZT74PW+KY1lBRkpfowz+xhrsL4vOH2Y4GBaIO89a/tug7touS1CygtokP1h3B6dqUmcIKigGFmlrAEhfn4GhXSfGXKSvhr0e5Elap/dzx05I+ZeXEpfCPviCgxlrZ6c4kqaJ17bnul4gTd5KPRH89psL94fSIBr3LBuD9OpVdubf0dKfcAK1j6TzSdYrnwLvdP2C4dFxg8yA5mK/jGaGE5iT7xLuLnHjOahdnzgNsH5FwsVR3B/jrd8UiVAeB9HEzljCWhwKDQTWaNH2TnbVz8u3YBHfB99aZ6XoFlNknoQnJUTpqMxnkzI9qoVzbq9FZurpW/MwX/sqRJRWJYf1c9CjaDMh31Z27RlHtCAbZQRG9Hw2/tDhEpoki8u5c6Qm7gv5+wvzrXpqLbYs615IqvT9YQ4GQfVEvX0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: * Bert Karwatzki [240712 08:18]: > I did some experiments on the rss counter bug. The next patch is made for linux-next-20240613 > with commit 1c29a32ce65f4cd0f1c0f9 reverted. Then I simply inlined the code of do_vmi_unmap() > and do_vmi_align_munmap() into mmap_region(). This version of the code works fine and does not > show the rss counter bug. Are you still working with v1 of this patch set? I root-caused the rss counter issue and seg fault to the fact that next or prev may be expanded and I was using the new start/end on munmap() in the completion. This was fixed in subsequent patches. I've sent v4 recently, but will have to a v5 to back off the removal of arch_unmap() for PPC. ... Thanks, Liam