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X-Rspamd-Queue-Id: 268A118000D X-Rspamd-Server: rspam02 X-HE-Tag: 1754397539-368012 X-HE-Meta: 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 Ckd6lq0F 16fec2LAVtvSfu9YZoP+NGemzIXHpxCtaw+8LO/rEXsk6IEx8WI5Tufn/wf0WcogkHKwVL7eaKKEQpgw+iZvURs/uTeG4J+FyfHCXpESK6zRwTm61wfMH81ayjhkhSLI0K4Ko 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: On Mon, Aug 04, 2025 at 05:19:59PM +0200, Vlastimil Babka wrote: > On 8/4/25 04:57, Li Qiong wrote: > > object_err() reports details of an object for further debugging, such as > > the freelist pointer, redzone, etc. However, if the pointer is invalid, > > attempting to access object metadata can lead to a crash since it does > > not point to a valid object. > > > > In case the pointer is NULL or check_valid_pointer() returns false for > > the pointer, only print the pointer value and skip accessing metadata. > > We should explain that this is not theoretical so justify the stable cc, so > I would add: > > One known path to the crash is when alloc_consistency_checks() determines > the pointer to the allocated object is invalid beause of a freelist nit: beause -> because > corruption, and calls object_err() to report it. The debug code should > report and handle the corruption gracefully and not crash in the process. > > If you agree, I can do this when picking up the patch after merge window, no > need to resend. > > > Fixes: 81819f0fc828 ("SLUB core") > > Cc: > > Signed-off-by: Li Qiong > > --- Reviewed-by: Harry Yoo -- Cheers, Harry / Hyeonggon