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From: Kuniyuki Iwashima To: Andrey Ryabinin , Andrew Morton , Vlastimil Babka , Harry Yoo Cc: Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Hao Li , Christoph Lameter , David Rientjes , Roman Gushchin , kasan-dev@googlegroups.com, linux-mm@kvack.org Content-Type: text/plain; charset="us-ascii" X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 296D1140002 X-Stat-Signature: zgwu33sg5qkyqcgsazr6p755fr73cn7i X-Rspam-User: X-Spam-Status: No, score=-13.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=no autolearn_force=no version=4.0.1 X-HE-Tag: 1793081717-980318 X-HE-Meta: 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 VDLN83Vf 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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 Fri, 09 Oct 2026 21:46:24 +0000, Kuniyuki Iwashima wrote: > Recently, syzbot has reported several weird use-after-free splats. > > What they have in common is that "Freed by" points to rcu_free_sheaf(), > whereas the object shown in "Call Trace:" and "Allocated by" is never > supposed to be freed via kfree_rcu(). > > This means the object was a victim of a double-free somewhere else and > was silently poisoned by rcu_free_sheaf() after being reallocated. > > This happens because kfree_rcu_sheaf() queues an object into the RCU > sheaf without invoking any KASAN hooks. > > This series enables KASAN to detect double-free involving > kfree_rcu_sheaf() immediately and adds KUnit tests for it. Hi KASAN maintainers, It would be appreciated if you review the series, or if respin/repost would be preferred, please let me know. Thank you !