From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f77.google.com (mail-io1-f77.google.com [209.85.166.77]) (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 235A422D7AC for ; Tue, 8 Apr 2025 14:28:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744122514; cv=none; b=CNzuqXqHZ5RI1DG0l9+wWlUJSp0zfO7ccZpZhQ/n4g0yWaagQycq6cBr2NyRqU2GkTyruRzwiJyWr31LU4khOz7rfKGmHwWheZetdneULLMfzf50ipfflclQRMlKfGE+OY+f/WWQ8i5hpIIZ/n7WFG9ziNiEeJIevnaBJrc/Epo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744122514; c=relaxed/simple; bh=398S5M/+3ThGLSGVOv9sf6n6Yy7e5m97YGbR95ICRxk=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=QciJy1uIgLtpiVpQs3DwYJvigQKyb2yMDGkRL054SHkI1irZgvFBgg2y/VgUdSVCfjttto13PGLPi8CtueGtIM9kMm2epFXk2nkkpwVWaPNORo1BckhlynmEm+5WKpCjhOdNhm/SMhXJ4/PfOzK7OhhhGq6it2HgWTUJCVi4DvE= 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=209.85.166.77 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-f77.google.com with SMTP id ca18e2360f4ac-85b5875e250so633936039f.0 for ; Tue, 08 Apr 2025 07:28:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744122512; x=1744727312; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=JtXuRvcX8C77E5Akswrn1Sl1bpeVKHQo/mJn8kenfR4=; b=KeJyS2pygFb7kaoch32WNJFvq/t1wf9NY2i0d6qyX+OhugTAkMt+Vr3Uz07dDibGcS xjVaYIJaKaXW4tjZMHC6U/NN9fndn833NPSxTKxjgWD5e7D2iGBe/S0ZuV/CusfX4V7r A5xbbDpaNwIlsYqa6hxVjD+ayxcJqjP3w9oXky4vOlaFjhFrkDPfCYrR+q3tuwumOjmq E08bVunNZhhuH3a8L3dCJzBcjj/2sDOWrh+B6MJnyMJg8PkzPQH+qQy+GO9bsqOQYt6y vpwKVl/Q94gHBN7YhUEnuzTY6ysDWQYGGuMrh0yIUcg8QW6euLWibXu4SA4hcNXt1LZ7 hUnw== X-Forwarded-Encrypted: i=1; AJvYcCXTolhITbicJG1N1KazPv5AZCTnHbJcjmm0xUhPK2onDjEu7BdQdznYSmXfyzUqtPJQqW0hdSxo5nFI24I=@vger.kernel.org X-Gm-Message-State: AOJu0Yz8bUGzvzQ+T44EH5pqzBKp7jMv460SQxvtwyJPqF6KhvnheZKz OtkSEDScERDWkna3ntAhfwZagKiKupC2Vv6SJLL3yHyNv0UkaLbAwIpcaHb2Ye2N0Ks8+WOjgyW LI7Ov5914vtFhS785UjWNTcTbHvpM+SxvFIQ+BWPvbrrcJ+yzn7DFbec= X-Google-Smtp-Source: AGHT+IFoNpkB/lUnW65pvReYWeDk3+ygf0bApzJMpVPK3YVFmTw/cJxZBHNxhyG9I4g7Z/wiJrhExlo/bMXbwABgnE355CrZyIPx 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:b4e:b0:3d5:bdac:c927 with SMTP id e9e14a558f8ab-3d6ec57ba36mr134066825ab.18.1744122512215; Tue, 08 Apr 2025 07:28:32 -0700 (PDT) Date: Tue, 08 Apr 2025 07:28:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67f53290.050a0220.12542b.0000.GAE@google.com> Subject: [syzbot] [net?] KMSAN: uninit-value in __vxlan_find_mac (2) 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: 92b71befc349 Merge tag 'objtool-urgent-2025-04-01' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11cdcfb0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a4ff50689306e9bc dashboard link: https://syzkaller.appspot.com/bug?extid=30db32094d453eb54941 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3f382dc1af56/disk-92b71bef.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f4e92ae0388c/vmlinux-92b71bef.xz kernel image: https://storage.googleapis.com/syzbot-assets/bf44161687ac/bzImage-92b71bef.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+30db32094d453eb54941@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in __vxlan_find_mac+0x49a/0x4f0 drivers/net/vxlan/vxlan_core.c:-1 __vxlan_find_mac+0x49a/0x4f0 drivers/net/vxlan/vxlan_core.c:-1 vxlan_find_mac drivers/net/vxlan/vxlan_core.c:437 [inline] vxlan_xmit+0x174c/0x3e40 drivers/net/vxlan/vxlan_core.c:2785 __netdev_start_xmit include/linux/netdevice.h:5201 [inline] netdev_start_xmit include/linux/netdevice.h:5210 [inline] xmit_one net/core/dev.c:3780 [inline] dev_hard_start_xmit+0x296/0xa40 net/core/dev.c:3796 __dev_queue_xmit+0x3679/0x57e0 net/core/dev.c:4633 dev_queue_xmit include/linux/netdevice.h:3350 [inline] __bpf_tx_skb net/core/filter.c:2135 [inline] __bpf_redirect_common net/core/filter.c:2179 [inline] __bpf_redirect+0x1514/0x1690 net/core/filter.c:2186 ____bpf_clone_redirect net/core/filter.c:2460 [inline] bpf_clone_redirect+0x37f/0x500 net/core/filter.c:2430 ___bpf_prog_run+0x12fd/0xf0b0 kernel/bpf/core.c:2018 __bpf_prog_run512+0xc5/0xf0 kernel/bpf/core.c:2313 bpf_dispatcher_nop_func include/linux/bpf.h:1316 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] bpf_test_run+0x546/0xd20 net/bpf/test_run.c:434 bpf_prog_test_run_skb+0x1906/0x25b0 net/bpf/test_run.c:1093 bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4427 __sys_bpf+0x6ce/0xdf0 kernel/bpf/syscall.c:5852 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline] __se_sys_bpf kernel/bpf/syscall.c:5939 [inline] __ia32_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5939 ia32_sys_call+0x2126/0x41f0 arch/x86/include/generated/asm/syscalls_32.h:358 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:4157 [inline] slab_alloc_node mm/slub.c:4200 [inline] kmem_cache_alloc_node_noprof+0x921/0xe10 mm/slub.c:4252 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577 pskb_expand_head+0x21f/0x1c10 net/core/skbuff.c:2247 skb_ensure_writable+0x496/0x520 net/core/skbuff.c:6241 __bpf_try_make_writable net/core/filter.c:1665 [inline] bpf_try_make_writable net/core/filter.c:1671 [inline] bpf_try_make_head_writable net/core/filter.c:1679 [inline] ____bpf_clone_redirect net/core/filter.c:2454 [inline] bpf_clone_redirect+0x1c5/0x500 net/core/filter.c:2430 ___bpf_prog_run+0x12fd/0xf0b0 kernel/bpf/core.c:2018 __bpf_prog_run512+0xc5/0xf0 kernel/bpf/core.c:2313 bpf_dispatcher_nop_func include/linux/bpf.h:1316 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] bpf_test_run+0x546/0xd20 net/bpf/test_run.c:434 bpf_prog_test_run_skb+0x1906/0x25b0 net/bpf/test_run.c:1093 bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4427 __sys_bpf+0x6ce/0xdf0 kernel/bpf/syscall.c:5852 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline] __se_sys_bpf kernel/bpf/syscall.c:5939 [inline] __ia32_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5939 ia32_sys_call+0x2126/0x41f0 arch/x86/include/generated/asm/syscalls_32.h:358 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: 9482 Comm: syz.5.941 Not tainted 6.14.0-syzkaller-12508-g92b71befc349 #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