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Wed, 11 Mar 2026 02:57:48 -0700 (PDT) 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: Wed, 11 Mar 2026 17:57:38 +0800 Message-Id: <20260311095738.4177239-1-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..f029003e7368 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2629,6 +2629,7 @@ static struct slab_sheaf *alloc_empty_sheaf(struct kmem_cache *s, gfp_t gfp) static void free_empty_sheaf(struct kmem_cache *s, struct slab_sheaf *sheaf) { + WARN_ON(sheaf->size > 0); kfree(sheaf); stat(s, SHEAF_FREE); @@ -2660,6 +2661,7 @@ static int refill_sheaf(struct kmem_cache *s, struct slab_sheaf *sheaf, return 0; } +static void sheaf_flush_unused(struct kmem_cache *s, struct slab_sheaf *sheaf); static struct slab_sheaf *alloc_full_sheaf(struct kmem_cache *s, gfp_t gfp) { @@ -2669,6 +2671,7 @@ static struct slab_sheaf *alloc_full_sheaf(struct kmem_cache *s, gfp_t gfp) return NULL; if (refill_sheaf(s, sheaf, gfp | __GFP_NOMEMALLOC)) { + sheaf_flush_unused(s, sheaf); free_empty_sheaf(s, sheaf); return NULL; } @@ -5027,6 +5030,7 @@ __pcs_replace_empty_main(struct kmem_cache *s, struct slub_percpu_sheaves *pcs, * we must be very low on memory so don't bother * with the barn */ + sheaf_flush_unused(s, empty); free_empty_sheaf(s, empty); } } else {