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Sun, 01 Mar 2026 19:41:11 -0800 (PST) From: Qing Wang To: syzbot+cae7809e9dc1459e4e63@syzkaller.appspotmail.com Cc: Liam.Howlett@oracle.com, akpm@linux-foundation.org, chao@kernel.org, jaegeuk@kernel.org, jannh@google.com, linkinjeon@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, pfalcato@suse.de, sj1557.seo@samsung.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Subject: Re: [syzbot] [mm?] [f2fs?] [exfat?] memory leak in __kfree_rcu_sheaf Date: Mon, 2 Mar 2026 11:41:02 +0800 Message-Id: <20260302034102.3145719-1-wangqing7171@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <698a26d3.050a0220.3b3015.007e.GAE@google.com> References: <698a26d3.050a0220.3b3015.007e.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit #syz test diff --git a/mm/slub.c b/mm/slub.c index cdc1e652ec52..387979b89120 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -6307,15 +6307,21 @@ bool __kfree_rcu_sheaf(struct kmem_cache *s, void *obj) goto fail; if (!local_trylock(&s->cpu_sheaves->lock)) { - barn_put_empty_sheaf(barn, empty); + if (barn && data_race(barn->nr_empty) < MAX_EMPTY_SHEAVES) + barn_put_empty_sheaf(barn, empty); + else + free_empty_sheaf(s, empty); goto fail; } pcs = this_cpu_ptr(s->cpu_sheaves); - if (unlikely(pcs->rcu_free)) - barn_put_empty_sheaf(barn, empty); - else + if (unlikely(pcs->rcu_free)) { + if (barn && data_race(barn->nr_empty) < MAX_EMPTY_SHEAVES) + barn_put_empty_sheaf(barn, empty); + else + free_empty_sheaf(s, empty); + } else pcs->rcu_free = empty; }