From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f79.google.com (mail-io1-f79.google.com [209.85.166.79]) (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 22F8B201270 for ; Thu, 1 May 2025 15:06:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746111997; cv=none; b=jiHcVYOOJJIJno3MzAn907xzJsCOaRqsZEFf2tdwkjGBICLDJQuy0f8HI7hoyyed0zokguhReX1qRngvt8vL6oeRttTSI6qKv3BcrtNoeSeioc8YgGIqKFSOoooVvshGjvQy+h+CpUorycZVtfFZ/yf/9s/jlsO++J8IsphZd5s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746111997; c=relaxed/simple; bh=92JOii3jWAj4DKJszDeSKnQVESqen0D5y2yAev8Bcr8=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=oRp9HIvcFk+YJUpOTxlU8j+thReDvQ5mmn3dIQdB7/aoW8JboUBrXg1mGS1Lj/8Wm7/Cu4eyqw5svRE8kuDxAPVy+/mInodhTdzz9PjHDUYaG0GN4copOmgALz4RySDtikBjQ74zO4NxVUzfi8FK137qoTKDek6V6r/r1K6NMp0= 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=209.85.166.79 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-f79.google.com with SMTP id ca18e2360f4ac-85b5a7981ccso91260139f.2 for ; Thu, 01 May 2025 08:06:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1746111994; x=1746716794; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=5eH4/IxyGIQ/j17sepFRV59/LJDy4eEAai5InyyCjic=; b=soeOEGaQw+wGOu9aA21W5I0v/R5/P2whswLepQO3zrD2WkP5+WWoUPR7Fpp40wRpuY 4tE+CE5NWFJs/AsN5e6zuSwu2OgO7+6UzpgCAKd/1K1EpjiiZpJqfV5HRMk39RvGk4Lg j1jzub3M2TwrlZK2fHQTFe61AOcm6t3H9yfWxAtNbLr/CiJfK0LuwJNO5gtyOzw13YYp EaJQ4g2JigZT4CNfoBend2tkr5uD27Ab/O9DWIobEMLjF9tZD741ND13tI29eO3IL0BK QqxYCpbUKwu5JF+V2JK9Rf3fJRLILI5fSNpoj3e+0SskEfbNPAhKC/h1adz3niqXdRDM 98xA== X-Forwarded-Encrypted: i=1; AJvYcCVMHbznQyDKyfNrp6obgV1rAYfcCimHGcFG7BOoGkCLX0xOb8GT1/5Q6w3RJ3BBwqidLhh3osarlh3qpKA=@vger.kernel.org X-Gm-Message-State: AOJu0YxZTr98QlXHToy+awOhEhlEmBXpisp53FmWWehGFPA10zV6B5t5 OH78ol4R0dfygZDW6kPfnmuQoHNz+0wTLvNPKfMeNWmpyfA5Pd9aJx2XBoyHHsy+NoghXnyZv4I NjgxeQLleIgq2o/cPv9Q1vRaiwTC5H2Hm78AQzEwr/F7X04ynPKsDYfw= X-Google-Smtp-Source: AGHT+IGYkc2mm1+x+Xnn83DF+/+Q+9KJ5OV64G6RWcU+6RzrPGXItspl2t697nEcTp5NrWyml02qnCseN8+nWVoYWR1ZWHN9NpPf Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:188e:b0:3d5:891c:13fb with SMTP id e9e14a558f8ab-3d9701c93cfmr29836155ab.4.1746111994269; Thu, 01 May 2025 08:06:34 -0700 (PDT) Date: Thu, 01 May 2025 08:06:34 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68138dfa.050a0220.14dd7d.0017.GAE@google.com> Subject: [syzbot] [lvs?] KMSAN: uninit-value in do_output_route4 From: syzbot To: coreteam@netfilter.org, davem@davemloft.net, edumazet@google.com, horms@verge.net.au, ja@ssi.bg, kadlec@netfilter.org, kuba@kernel.org, linux-kernel@vger.kernel.org, lvs-devel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pabeni@redhat.com, pablo@netfilter.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: bc3372351d0c Merge tag 'for-6.15-rc3-tag' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12d64574580000 kernel config: https://syzkaller.appspot.com/x/.config?x=fca45111586bf9a6 dashboard link: https://syzkaller.appspot.com/bug?extid=04b9a82855c8aed20860 compiler: Debian clang version 15.0.6, Debian LLD 15.0.6 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/01b8968610a1/disk-bc337235.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/528a97652269/vmlinux-bc337235.xz kernel image: https://storage.googleapis.com/syzbot-assets/768ed51bbb66/bzImage-bc337235.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+04b9a82855c8aed20860@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in do_output_route4+0x42c/0x4d0 net/netfilter/ipvs/ip_vs_xmit.c:147 do_output_route4+0x42c/0x4d0 net/netfilter/ipvs/ip_vs_xmit.c:147 __ip_vs_get_out_rt+0x403/0x21d0 net/netfilter/ipvs/ip_vs_xmit.c:330 ip_vs_tunnel_xmit+0x205/0x2380 net/netfilter/ipvs/ip_vs_xmit.c:1136 ip_vs_in_hook+0x1aa5/0x35b0 net/netfilter/ipvs/ip_vs_core.c:2063 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xf7/0x400 net/netfilter/core.c:626 nf_hook include/linux/netfilter.h:269 [inline] __ip_local_out+0x758/0x7e0 net/ipv4/ip_output.c:118 ip_local_out net/ipv4/ip_output.c:127 [inline] ip_send_skb+0x6a/0x3c0 net/ipv4/ip_output.c:1501 udp_send_skb+0xfda/0x1b70 net/ipv4/udp.c:1195 udp_sendmsg+0x2fe3/0x33c0 net/ipv4/udp.c:1483 inet_sendmsg+0x1fc/0x280 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x267/0x380 net/socket.c:727 ____sys_sendmsg+0x91b/0xda0 net/socket.c:2566 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2620 __sys_sendmmsg+0x41d/0x880 net/socket.c:2702 __compat_sys_sendmmsg net/compat.c:360 [inline] __do_compat_sys_sendmmsg net/compat.c:367 [inline] __se_compat_sys_sendmmsg net/compat.c:364 [inline] __ia32_compat_sys_sendmmsg+0xc8/0x140 net/compat.c:364 ia32_sys_call+0x3ffa/0x41f0 arch/x86/include/generated/asm/syscalls_32.h:346 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Uninit was created at: slab_post_alloc_hook mm/slub.c:4167 [inline] slab_alloc_node mm/slub.c:4210 [inline] __kmalloc_cache_noprof+0x8fa/0xe00 mm/slub.c:4367 kmalloc_noprof include/linux/slab.h:905 [inline] ip_vs_dest_dst_alloc net/netfilter/ipvs/ip_vs_xmit.c:61 [inline] __ip_vs_get_out_rt+0x35d/0x21d0 net/netfilter/ipvs/ip_vs_xmit.c:323 ip_vs_tunnel_xmit+0x205/0x2380 net/netfilter/ipvs/ip_vs_xmit.c:1136 ip_vs_in_hook+0x1aa5/0x35b0 net/netfilter/ipvs/ip_vs_core.c:2063 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xf7/0x400 net/netfilter/core.c:626 nf_hook include/linux/netfilter.h:269 [inline] __ip_local_out+0x758/0x7e0 net/ipv4/ip_output.c:118 ip_local_out net/ipv4/ip_output.c:127 [inline] ip_send_skb+0x6a/0x3c0 net/ipv4/ip_output.c:1501 udp_send_skb+0xfda/0x1b70 net/ipv4/udp.c:1195 udp_sendmsg+0x2fe3/0x33c0 net/ipv4/udp.c:1483 inet_sendmsg+0x1fc/0x280 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x267/0x380 net/socket.c:727 ____sys_sendmsg+0x91b/0xda0 net/socket.c:2566 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2620 __sys_sendmmsg+0x41d/0x880 net/socket.c:2702 __compat_sys_sendmmsg net/compat.c:360 [inline] __do_compat_sys_sendmmsg net/compat.c:367 [inline] __se_compat_sys_sendmmsg net/compat.c:364 [inline] __ia32_compat_sys_sendmmsg+0xc8/0x140 net/compat.c:364 ia32_sys_call+0x3ffa/0x41f0 arch/x86/include/generated/asm/syscalls_32.h:346 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369 entry_SYSENTER_compat_after_hwframe+0x84/0x8e CPU: 0 UID: 0 PID: 22408 Comm: syz.4.5165 Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ===================================================== --- 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