From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 09A541DC18F for ; Thu, 14 Nov 2024 10:40:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731580829; cv=none; b=g8dv6Dz1ZyhywzubcfKHfTupp9UgD/wGKXKe+f7SUTrbMXqY3VBzMVLk05fctK+q5GvEz4NUTa0rDHIujkXNK9gMrVZJE/u0KLuM6Jcx0LAaVNyU66SnoNBbPFOmzAZHstMVEi2veg3sv0eplrWMvKcS1/h67qUKKCo/SkY88eg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731580829; c=relaxed/simple; bh=hebrmXkhCY09OG8h8nGV0uOtICvEfbpG8iGrrMU9xw8=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=RDQ3nHwhyUV1wraEHntDmVJi8zeVqcliIEDHwH53xm6ZQ2hGunYO9gRnZdOPkotVCunB7f/ZQuVGJB7fWeUK8xNEajjabu9wb0spaK9PZ8+IJM2J/bHWeXrEzjxP3+AZnnTEFDnQoxPF+mdHFQ9ujMyOMW1jwgkn0fmmxvkYIZc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.69 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-io1-f69.google.com with SMTP id ca18e2360f4ac-83ab1b39ab1so47242639f.1 for ; Thu, 14 Nov 2024 02:40:27 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731580827; x=1732185627; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=EpQKVoCHR7S/IBsmhXUKOE1cWASKXA9mRVe4LwtSsA8=; b=JWeM0hCS8krTRocV5jfiysvI9nT2DVnFUUyelBBP0VH3nUF36BZmdAt3NPOIeyB+Ua NpDSCm2E6t4/fdOAE/3hl+Ff6H7ko1PBBYB57Cdvt2uEPC6VvS1OygFLEtwX7v9CwjbP 8gtekOPRcTIVVQUsG0OzOdPf0/kfFP3Tyy7DxOD+SHsp1h7U1GulL9h1zQN+YPQHVVam 6vy0hHIwuk8QGhH1xx0IJ/WMKPRoJ9+NSV3mhnDY7mKF3MsytmaU9dSsnQGCtMk9Jzwe TJzO5deASBtcCKyPiFaXc7KUlAt2JedPMNmuNNkL9f0cAV5Tz9gWJ9IStPg7t8YICoGJ zl6w== X-Forwarded-Encrypted: i=1; AJvYcCUJll5yoi4G1Ed1okXFPfBz/M2Kl9hP7AtVsHCBX6C7G8+0gQ2LsPtwnAHOhn0NO1+vmRUrHpA=@vger.kernel.org X-Gm-Message-State: AOJu0YxNK/HtVAtXhxUsmGEBcEKrMj52uWyHbufnOrIc8gccXYLWt4y+ vHtylZ1IfiuDQFywx1INiz8tvlzXPKprrKrYTfJ7RVn6NcL1pPZFoFPuZuCTwWBpFHuB+arDDUh tHCsNO+0+M1GPLKyu8AyN5KxdWaUlmmjpk5+ZnQKDzmD2yZ4C2YbL01A= X-Google-Smtp-Source: AGHT+IH38snHZpugJh/yH983zqKsVOwZbdixl4mY7r5cQJ5XXnavU66eqXKouJUw8ctrq6tpF+9BCwWKFI2IbH6enGPxVAT2H6GQ Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:184d:b0:3a7:2b12:78dd with SMTP id e9e14a558f8ab-3a72b1279b5mr6172675ab.11.1731580826776; Thu, 14 Nov 2024 02:40:26 -0800 (PST) Date: Thu, 14 Nov 2024 02:40:26 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6735d39a.050a0220.1324f8.0096.GAE@google.com> Subject: [syzbot] [net?] KMSAN: uninit-value in __vxlan_find_mac From: syzbot To: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, 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: de2f378f2b77 Merge tag 'nfsd-6.12-4' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15b170c0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e4580d62ee1893a5 dashboard link: https://syzkaller.appspot.com/bug?extid=35e7e2811bbe5777b20e compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f0ff1d637186/disk-de2f378f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1515128a919f/vmlinux-de2f378f.xz kernel image: https://storage.googleapis.com/syzbot-assets/6624bf235bc6/bzImage-de2f378f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+35e7e2811bbe5777b20e@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in __vxlan_find_mac+0x497/0x4e0 __vxlan_find_mac+0x497/0x4e0 vxlan_find_mac drivers/net/vxlan/vxlan_core.c:436 [inline] vxlan_xmit+0x1669/0x39f0 drivers/net/vxlan/vxlan_core.c:2753 __netdev_start_xmit include/linux/netdevice.h:4928 [inline] netdev_start_xmit include/linux/netdevice.h:4937 [inline] xmit_one net/core/dev.c:3588 [inline] dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3604 __dev_queue_xmit+0x3562/0x56d0 net/core/dev.c:4432 dev_queue_xmit include/linux/netdevice.h:3094 [inline] __bpf_tx_skb net/core/filter.c:2152 [inline] __bpf_redirect_common net/core/filter.c:2196 [inline] __bpf_redirect+0x148c/0x1610 net/core/filter.c:2203 ____bpf_clone_redirect net/core/filter.c:2477 [inline] bpf_clone_redirect+0x37e/0x500 net/core/filter.c:2447 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:2010 __bpf_prog_run512+0xc5/0xf0 kernel/bpf/core.c:2253 bpf_dispatcher_nop_func include/linux/bpf.h:1265 [inline] __bpf_prog_run include/linux/filter.h:701 [inline] bpf_prog_run include/linux/filter.h:708 [inline] bpf_test_run+0x546/0xd20 net/bpf/test_run.c:434 bpf_prog_test_run_skb+0x182f/0x24d0 net/bpf/test_run.c:1095 bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4266 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5671 __do_sys_bpf kernel/bpf/syscall.c:5760 [inline] __se_sys_bpf kernel/bpf/syscall.c:5758 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5758 x64_sys_call+0x2cce/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: slab_post_alloc_hook mm/slub.c:4091 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4186 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587 pskb_expand_head+0x226/0x1a60 net/core/skbuff.c:2275 skb_ensure_writable+0x496/0x520 net/core/skbuff.c:6214 __bpf_try_make_writable net/core/filter.c:1677 [inline] bpf_try_make_writable net/core/filter.c:1683 [inline] bpf_try_make_head_writable net/core/filter.c:1691 [inline] ____bpf_clone_redirect net/core/filter.c:2471 [inline] bpf_clone_redirect+0x1c5/0x500 net/core/filter.c:2447 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:2010 __bpf_prog_run512+0xc5/0xf0 kernel/bpf/core.c:2253 bpf_dispatcher_nop_func include/linux/bpf.h:1265 [inline] __bpf_prog_run include/linux/filter.h:701 [inline] bpf_prog_run include/linux/filter.h:708 [inline] bpf_test_run+0x546/0xd20 net/bpf/test_run.c:434 bpf_prog_test_run_skb+0x182f/0x24d0 net/bpf/test_run.c:1095 bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4266 __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5671 __do_sys_bpf kernel/bpf/syscall.c:5760 [inline] __se_sys_bpf kernel/bpf/syscall.c:5758 [inline] __x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5758 x64_sys_call+0x2cce/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 8041 Comm: syz.2.760 Not tainted 6.12.0-rc6-syzkaller-00279-gde2f378f2b77 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 ===================================================== --- 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