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=103213a5a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=fa5bd4cd5ab6259d dashboard link: https://syzkaller.appspot.com/bug?extid=d810d3cd45ed1848c3f7 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=1475a873a80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=153cc91ba80000 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 The issue was bisected to: commit 718cb09aaa6fa78cc8124e9517efbc6c92665384 Author: Vlad Buslov <vladbu@xxxxxxxxxx> Date: Tue Aug 8 09:35:21 2023 +0000 vlan: Fix VLAN 0 memory leak bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12cbf169a80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=11cbf169a80000 console output: https://syzkaller.appspot.com/x/log.txt?x=16cbf169a80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d810d3cd45ed1848c3f7@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 718cb09aaa6f ("vlan: Fix VLAN 0 memory leak") ------------[ cut here ]------------ WARNING: CPU: 0 PID: 12 at net/core/dev.c:10876 unregister_netdevice_many_notify+0x14d8/0x19a0 net/core/dev.c:10876 Modules linked in: CPU: 0 PID: 12 Comm: kworker/u4:1 Not tainted 6.5.0-rc4-syzkaller-00248-g048c796beb6e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Workqueue: netns cleanup_net 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:ffffc90000117a30 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000070de5201 RCX: 0000000000000000 RDX: ffff88801526d940 RSI: ffffffff8829a7b8 RDI: 0000000000000001 RBP: ffff88807d7ee000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff81004e11 R12: ffff888018fb2a00 R13: 0000000000000000 R14: 0000000000000002 R15: ffff888018fb2a00 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005581d741a950 CR3: 000000007deef000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ip6_tnl_exit_batch_net+0x57d/0x6f0 net/ipv6/ip6_tunnel.c:2278 ops_exit_list+0x125/0x170 net/core/net_namespace.c:175 cleanup_net+0x505/0xb20 net/core/net_namespace.c:614 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597 worker_thread+0x687/0x1110 kernel/workqueue.c:2748 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 </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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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
