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AJvYcCVwVxVqDt16XHx1xGJQvAhb8j5/yKAna0FCmZ/2tzTWBUspdivn0V40taHSX5OQwmz79LVCz4NwYYpyRNg=@vger.kernel.org X-Gm-Message-State: AOJu0YwmwKYNU4yTkfuI9babCiCQen8298eOVpjnkUUPrjOlLdHSiaE0 I0dT/CYAYTUdKgIPxgawWsaNkSOJjeB7kaqY+DPiL4mU+dZz626Z71wS8Xs8M3EBa0empbuqzHr U5q87O5EIlPwSCODD+UmB+1hRFKgBaONZOI9pG4nr2s1a+Ct5VUdsSXM= X-Google-Smtp-Source: AGHT+IG9K8WOrkufEOH9DrP8lMVAsJtn15VEV17W8fw+GqqGRMkAx/TAFYzoI9XWkt66axHeeciyGXYjbrh8oKDpRa1GaMLE4IpO Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2206:b0:3d2:aa73:7b7a with SMTP id e9e14a558f8ab-3d9701e4da5mr24991275ab.12.1746098197408; Thu, 01 May 2025 04:16:37 -0700 (PDT) Date: Thu, 01 May 2025 04:16:37 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68135815.050a0220.3a872c.000e.GAE@google.com> Subject: [syzbot] [net?] upstream test error: KMSAN: uninit-value in mctp_dump_addrinfo From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, jk@codeconstruct.com.au, kuba@kernel.org, linux-kernel@vger.kernel.org, matt@codeconstruct.com.au, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: b4432656b36e Linux 6.15-rc4 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=173ea374580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f944a52db88df992 dashboard link: https://syzkaller.appspot.com/bug?extid=e76d52dadc089b9d197f compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/26fcd648d1b5/disk-b4432656.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/25ce9039317e/vmlinux-b4432656.xz kernel image: https://storage.googleapis.com/syzbot-assets/387f0baa5e6e/bzImage-b4432656.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e76d52dadc089b9d197f@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 rtnl_dump_all+0x3ec/0x5b0 net/core/rtnetlink.c:4380 rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6824 netlink_dump+0x97b/0x1690 net/netlink/af_netlink.c:2309 __netlink_dump_start+0x716/0xd60 net/netlink/af_netlink.c:2424 netlink_dump_start include/linux/netlink.h:340 [inline] rtnetlink_dump_start net/core/rtnetlink.c:6853 [inline] rtnetlink_rcv_msg+0x1262/0x14b0 net/core/rtnetlink.c:6920 netlink_rcv_skb+0x54a/0x680 net/netlink/af_netlink.c:2534 rtnetlink_rcv+0x35/0x40 net/core/rtnetlink.c:6982 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0xed5/0x1290 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x10b3/0x1250 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 __sys_sendto+0x590/0x710 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __x64_sys_sendto+0x130/0x200 net/socket.c:2183 x64_sys_call+0x3c0b/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:45 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4167 [inline] slab_alloc_node mm/slub.c:4210 [inline] kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4262 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:577 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1340 [inline] netlink_alloc_large_skb+0xa5/0x280 net/netlink/af_netlink.c:1187 netlink_sendmsg+0xaea/0x1250 net/netlink/af_netlink.c:1858 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 __sys_sendto+0x590/0x710 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __x64_sys_sendto+0x130/0x200 net/socket.c:2183 x64_sys_call+0x3c0b/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:45 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 5447 Comm: dhcpcd Not tainted 6.15.0-rc4-syzkaller #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup