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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: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: DB9ED160003 X-Stat-Signature: ror7nh6q5qzcioxa58ogccpbfdepphck X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1775186057-892271 X-HE-Meta: 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 DHAwIKG7 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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/