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AJvYcCXDnG+XR7ZQBxngF7V2Gg8eIdq3Q/L/t+mgjbLWt3hfMcsHqVTCMP2i7j/WrZMVCem2IB1B7dfVyP/toqs=@vger.kernel.org X-Gm-Message-State: AOJu0Yyy6Slm3qWwPm1UmoWDpaT++stTLNC9hBmwUwHeia7oDGjfStKl B3bCDsFKketNr6RpdQ1So2Dyh5aEpA9Yrrn8rFeVDBWzv+MALSLHYeWvr9J1qMA8rpdl7jnTvN8 6BYxCygpMLunjTdZ5Ie4NUe7tOyA+DZoHaCT9+CTRTVQHgfoKit6vRXApcTE= X-Google-Smtp-Source: AGHT+IEizQRhbwzsT0ggg2NbSvLb9A6mZiSSmAn0Yfk/ZQAxOcHAEaCQbj3upjiHzCayK+nIiXCaAoQeo8YggenpKLKisWYRQsuC Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2197:b0:42f:87c1:cc3f with SMTP id e9e14a558f8ab-430c526b099mr477214245ab.18.1761410421784; Sat, 25 Oct 2025 09:40:21 -0700 (PDT) Date: Sat, 25 Oct 2025 09:40:21 -0700 In-Reply-To: <68dc3dac.a00a0220.102ee.004f.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68fcfd75.050a0220.346f24.02ff.GAE@google.com> Subject: Re: [syzbot] [rdma?] KMSAN: uninit-value in ib_nl_handle_ip_res_resp From: syzbot To: enjuk@amazon.com, jgg@ziepe.ca, leon@kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, syzkaller-bugs@googlegroups.com, yanjun.zhu@linux.dev Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 566771afc7a8 Merge tag 'v6.18-rc2-smb-server-fixes' of git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12f017e2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=dce7eac4016da338 dashboard link: https://syzkaller.appspot.com/bug?extid=938fcd548c303fe33c1a compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13714be2580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=100b5d2f980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bc5e0bc7a5d9/disk-566771af.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6b2be7ad3b45/vmlinux-566771af.xz kernel image: https://storage.googleapis.com/syzbot-assets/09a4929333f1/bzImage-566771af.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+938fcd548c303fe33c1a@syzkaller.appspotmail.com netlink: 8 bytes leftover after parsing attributes in process `syz.0.18'. ===================================================== BUG: KMSAN: uninit-value in hex_byte_pack include/linux/hex.h:13 [inline] BUG: KMSAN: uninit-value in ip6_string+0xef4/0x13a0 lib/vsprintf.c:1490 hex_byte_pack include/linux/hex.h:13 [inline] ip6_string+0xef4/0x13a0 lib/vsprintf.c:1490 ip6_addr_string+0x18a/0x3e0 lib/vsprintf.c:1509 ip_addr_string+0x245/0xee0 lib/vsprintf.c:1633 pointer+0xc09/0x1bd0 lib/vsprintf.c:2542 vsnprintf+0xf8a/0x1bd0 lib/vsprintf.c:2930 vprintk_store+0x3ae/0x1530 kernel/printk/printk.c:2252 vprintk_emit+0x21a/0xb60 kernel/printk/printk.c:2399 vprintk_default+0x3f/0x50 kernel/printk/printk.c:2438 vprintk+0x36/0x50 kernel/printk/printk_safe.c:82 _printk+0x17e/0x1b0 kernel/printk/printk.c:2448 ib_nl_process_good_ip_rsep drivers/infiniband/core/addr.c:128 [inline] ib_nl_handle_ip_res_resp+0x963/0x9d0 drivers/infiniband/core/addr.c:141 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:-1 [inline] rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0xefa/0x11c0 drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0xf04/0x12b0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x10b3/0x1250 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x333/0x3d0 net/socket.c:742 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2630 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2684 __sys_sendmsg net/socket.c:2716 [inline] __do_sys_sendmsg net/socket.c:2721 [inline] __se_sys_sendmsg net/socket.c:2719 [inline] __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2719 x64_sys_call+0x1dfd/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable gid.i created at: ib_nl_process_good_ip_rsep drivers/infiniband/core/addr.c:102 [inline] ib_nl_handle_ip_res_resp+0x254/0x9d0 drivers/infiniband/core/addr.c:141 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:-1 [inline] rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0xefa/0x11c0 drivers/infiniband/core/netlink.c:259 CPU: 0 UID: 0 PID: 6093 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 ===================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.