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Thu, 02 Apr 2026 20:14:16 -0700 (PDT) From: Qing Wang To: urezki@gmail.com Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzbot+37b7f6cd519f7fb8d32a@syzkaller.appspotmail.com, wangqing7171@gmail.com Subject: Re: [PATCH] mm/vmalloc: fix KMSAN uninit-value warning in decay_va_pool_node() Date: Fri, 3 Apr 2026 11:14:09 +0800 Message-Id: <20260403031409.2038306-1-wangqing7171@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Thu, 02 Apr 2026 at 23:45, Uladzislau Rezki wrote: > > KMSAN reported an uninit-value warning when accessing vmap_area->list > > in decay_va_pool_node(): > > > > BUG: KMSAN: uninit-value in __list_del_entry_valid include/linux/list.h:-1 [inline] > > BUG: KMSAN: uninit-value in __list_del_entry include/linux/list.h:223 [inline] > > BUG: KMSAN: uninit-value in list_del_init include/linux/list.h:295 [inline] > > BUG: KMSAN: uninit-value in decay_va_pool_node+0xf78/0x1dd0 mm/vmalloc.c:2255 > > > > Uninit was created at: > > kmem_cache_alloc_node_noprof+0x3cd/0x12d0 mm/slub.c:4918 > > alloc_vmap_area+0x327/0x2e30 mm/vmalloc.c:2065 > > > > The root cause is that if node_alloc() fail and the va is allocated via > > kmem_cache_alloc_node() by alloc_vmap_area(), va->list will be uninitialized. > > > > Fix this by explicitly initializing va->list after allocation. > > > > Reported-by: syzbot+37b7f6cd519f7fb8d32a@syzkaller.appspotmail.com > > Closes: https://syzkaller.appspot.com/bug?extid=37b7f6cd519f7fb8d32a > > > I can not access two above links. Are they valid? I would like to have > a look at report. Try to it? https://lore.kernel.org/all/69cdff26.050a0220.2dbe29.0001.GAE@google.com/T/