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 +LmQp3Ca 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Sat Oct 31, 2026 at 10:13 PM EDT, Gregory Price (Meta) wrote: > Commit 2c4c3e29897d ("mm/page_alloc: simplify __alloc_pages_slowpath() > flow") retries an allocation once with reserve_flags when the caller > becomes eligible for reserves, guarded by can_retry_reserves. > > A restart after a cpuset update or a zonelist rebuild retries with > can_retry_reserves already set to false, so a caller that cannot > reclaim (GFP_NOWAIT | __GFP_MEMALLOC), fails without trying reserves. > > Reset can_retry_reserves on restart. Only a cpuset or zonelist change > restarts the slowpath, so the retry still runs at most once per change. > > With a kprobe helping to make the race deterministic, an allocation > can be made to return NULL. With this patch the allocation will succeed. > > Fixes: 2c4c3e29897d ("mm/page_alloc: simplify __alloc_pages_slowpath() fl= ow") > Cc: stable@vger.kernel.org > Signed-off-by: Gregory Price (Meta) > --- > mm/page_alloc.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > LGTM. Acked-by: Zi Yan --=20 Best Regards, Yan, Zi