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Message-ID: <00000000000090196d0602a6167d@google.com> Date: Fri, 11 Aug 2023 06:57:06 -0700 From: syzbot <syzbot+662f783a5cdf3add2719@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [net?] WARNING in unregister_vlan_dev Hello, syzbot found the following issue on: HEAD commit: 048c796beb6e ipv6: adjust ndisc_is_useropt() to also retur.. git tree: net console+strace: https://syzkaller.appspot.com/x/log.txt?x=122a53aba80000 kernel config: https://syzkaller.appspot.com/x/.config?x=fa5bd4cd5ab6259d dashboard link: https://syzkaller.appspot.com/bug?extid=662f783a5cdf3add2719 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1604a23da80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15261ffda80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bf6b84b5998f/disk-048c796b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4000dee89ebe/vmlinux-048c796b.xz kernel image: https://storage.googleapis.com/syzbot-assets/b700ee9bd306/bzImage-048c796b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+662f783a5cdf3add2719@...kaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5027 at net/core/dev.c:10876 unregister_netdevice_many_notify+0x14d8/0x19a0 net/core/dev.c:10876 Modules linked in: CPU: 0 PID: 5027 Comm: syz-executor906 Not tainted 6.5.0-rc4-syzkaller-00248-g048c796beb6e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:unregister_netdevice_many_notify+0x14d8/0x19a0 net/core/dev.c:10876 Code: b4 1a 00 00 48 c7 c6 e0 18 81 8b 48 c7 c7 20 19 81 8b c6 05 ab 19 6c 06 01 e8 b4 22 23 f9 0f 0b e9 64 f7 ff ff e8 68 60 5c f9 <0f> 0b e9 3b f7 ff ff e8 fc 68 b0 f9 e9 fc ec ff ff 4c 89 e7 e8 4f RSP: 0018:ffffc900039bfae0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000027f95e01 RCX: 0000000000000000 RDX: ffff88802d241dc0 RSI: ffffffff8829a7b8 RDI: 0000000000000001 RBP: ffff88807c680000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff8a40008b R12: ffff888029882e80 R13: 0000000000000000 R14: 0000000000000002 R15: ffff888029882e80 FS: 0000555555f8f380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020002800 CR3: 000000007f16b000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> unregister_netdevice_many net/core/dev.c:10906 [inline] unregister_netdevice_queue+0x2e5/0x3c0 net/core/dev.c:10786 unregister_vlan_dev+0x2a9/0x580 net/8021q/vlan.c:118 vlan_ioctl_handler+0x387/0xa80 net/8021q/vlan.c:627 sock_ioctl+0x4b0/0x6e0 net/socket.c:1271 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f29480b4419 Code: 48 83 c4 28 c3 e8 d7 19 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdb9d37898 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f2948101390 RCX: 00007f29480b4419 RDX: 0000000020002800 RSI: 0000000000008982 RDI: 0000000000000004 RBP: 0000000000000003 R08: 0000555500000000 R09: 0000555500000000 R10: 0000555500000000 R11: 0000000000000246 R12: 00007ffdb9d378e0 R13: 00007ffdb9d378b0 R14: 0000000000000001 R15: 00007ffdb9d378e0 </TASK> --- 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@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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