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AJvYcCXoHAO0R4nh1kdidt6jGLfwFLLiz7BaPNxs52vej5YtF6UIgXMN5tiiDzhzuydoLanwJ6nlb5QLNrru/Q797kb5oPJS48rEVjGSkH27 X-Gm-Message-State: AOJu0Yx/9eMHgclG39ZJ3AizH2l8KaadRv1+oWAZLgR1WxlX0ZwkkAHm kYnKuP2jFqYcZJzuX4hKgr9AoWMBOxhq8Ay7e96iWMrot73TPRBNHFI1bFevSnSxs0/puKgGbFD JJ79ilE9o2F850jSX9UNQt9Ntui+K+4k953Nk X-Received: by 2002:a17:902:ea04:b0:1e0:a0d1:ade8 with SMTP id s4-20020a170902ea0400b001e0a0d1ade8mr141144plg.7.1712134037992; Wed, 03 Apr 2024 01:47:17 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <000000000000f9ce6d061494e694@google.com> <2ee098ec-a46f-44fa-8719-049331c4c206@linux.dev> <02d29315-13ee-45c1-984e-13c98e88247b@linux.dev> In-Reply-To: <02d29315-13ee-45c1-984e-13c98e88247b@linux.dev> From: Aleksandr Nogikh Date: Wed, 3 Apr 2024 10:47:03 +0200 Message-ID: Subject: Re: [syzbot] [bpf?] KMSAN: uninit-value in trie_delete_elem To: Yonghong Song Cc: Alexander Potapenko , syzbot , andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, eddyz87@gmail.com, haoluo@google.com, john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org, linux-kernel@vger.kernel.org, martin.lau@linux.dev, sdf@google.com, song@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, Apr 3, 2024 at 5:59=E2=80=AFAM Yonghong Song wrote: > > > On 4/1/24 11:36 PM, Aleksandr Nogikh wrote: > > Hi, > > > > On Mon, Apr 1, 2024 at 8:55=E2=80=AFPM Yonghong Song wrote: > >> > >> On 3/26/24 12:00 PM, syzbot wrote: > >>> Hello, > >>> > >>> syzbot found the following issue on: > >>> > >>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D > >>> BUG: KMSAN: uninit-value in trie_delete_elem+0xc0/0xbe0 kernel/bpf/lp= m_trie.c:448 > >> Unrelated to the bug itself, with KMSAN is enabled, qemu cannot boot m= y vm > >> any more. Anything special I need to do in order to boot a KMSAN kerne= l? > >> > > Does the kernel print any specific errors to the serial console while > > booting? Or nothing at all? > > In my case, nothing at all. > If you're using qemu, please try adding "-machine pc-q35-7.1" to its arguments. Otherwise it's known to have problems with very large kernel images. --=20 Aleksandr