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b=bQ6m7d/IypMudNG0ClR4/F6d2wvPfADidg9ROFa4/xfs8MsRnHrTX6sEenAXhAVJm Mr8GHAUMspE2LoggB0WZ+oAkU1a5FLdD8tZF/C1W79KzChQnfnj9u9NUajgwYQP4NO ZwDHC4FN+Ix8NNhmIOZ31ux9IAUc1D18FOTwJOiTMBkcnsnWhIoXzwSGWoTDPcPzGh 5lGL8/Cl5jfp840rUbVGapPokme8JYFOglKC09gKFMHfZbaOKh8OulA1PkyayfAP+s xaZTZvX4KlEVuciw+z3ywgF4ld1H4C1xU2VAqrAR5QkQEvL2lVogkmcBScg0ZWUNdJ CGyOY0Vgw3e6Q== From: SJ Park To: Igor Putko Cc: SJ Park , akpm@linux-foundation.org, damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm/damon/vaddr: check address space stability before VMA traversal Date: Tue, 30 Jun 2026 18:08:13 -0700 Message-ID: <20260701010814.96836-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260630152558.24063-1-igorpetindev@gmail.com> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: B5C1280009 X-Rspam-User: X-Stat-Signature: adfia4xwsafg4ih5q16a9wkkpp3bopo1 X-HE-Tag: 1782868102-155969 X-HE-Meta: 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 oAek9I1g EUZd2Tgi61kzRJSzX6sGHfr/9J53GDX66JcjyZ8MaLnNmxYVrkChxa5DpfeQM4OUHBFPDxnPq30Nwa86XKjE0+MChnt9yhxl7CO0YM0w1v1WoUSkai4xILCzUbbt6efGkA5jJrUZNMXhmM3ElnEyRzUkc+jXwpPyKWqSbirDuFS+x520whDNwcofXyoTe2vs5oSWnp9X0e2Ndp0DgBRmua9h82228vcabAScq8s+NilSSKqXhfoOQj+wiBUfQqeZamUNs Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 30 Jun 2026 18:25:58 +0300 Igor Putko wrote: > In __damon_va_three_regions(), the VMA tree is traversed without > checking if the address space is stable. If the OOM reaper runs > concurrently, it may mark the mm as MMF_UNSTABLE and leave empty > markers in the maple tree. I initially thought this is correct, but... Hasn't the series starting from commit bed76bec3111 ("mm: relocate the page table ceiling and floor definitions") fixed the issue? Thanks, SJ [...]