8021q: adding VLAN 0 to HW filter on device Ã
------------[ cut here ]------------
WARNING: CPU: 1 PID: 13395 at net/ipv6/route.c:4857 rt6_multipath_rebalance+0x455/0x8b0 net/ipv6/route.c:4857
Modules linked in:
CPU: 1 UID: 0 PID: 13395 Comm: syz.1.2039 Not tainted 6.16.0-rc7-syzkaller-02024-gfa582ca7e187 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:rt6_multipath_rebalance+0x455/0x8b0 net/ipv6/route.c:4857
Code: ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 85 fe ff ff 4c 89 e7 e8 4d d0 fd f7 e9 78 fe ff ff e8 33 c1 9b f7 eb 05 e8 2c c1 9b f7 90 <0f> 0b 90 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 45 9c 4b 01
RSP: 0018:ffffc900043ee580 EFLAGS: 00010283
RAX: ffffffff8a2466fd RBX: ffff888055830800 RCX: 0000000000080000
RDX: ffffc9001af18000 RSI: 000000000005ac36 RDI: 000000000005ac37
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200087dca8 R12: ffff88803252acde
R13: ffff888055830890 R14: 0000000000000000 R15: 1ffff1100ab06112
FS:  00007f3d0b1b26c0(0000) GS:ffff888125d23000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c284d71 CR3: 0000000052486000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 fib6_ifup+0x14a/0x180 net/ipv6/route.c:4873
 fib6_clean_node+0x24d/0x590 net/ipv6/ip6_fib.c:2246
 fib6_walk_continue+0x678/0x910 net/ipv6/ip6_fib.c:2171
 fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2219
 fib6_clean_tree net/ipv6/ip6_fib.c:2299 [inline]
 __fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2315
 rt6_sync_up+0x128/0x160 net/ipv6/route.c:4891
 addrconf_notify+0xd55/0x1010 net/ipv6/addrconf.c:3728
 notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
 __dev_notify_flags+0x21b/0x2e0 net/core/dev.c:9593
 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9608
 do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3143
 rtnl_group_changelink net/core/rtnetlink.c:3775 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3929 [inline]
 rtnl_newlink+0x149f/0x1c70 net/core/rtnetlink.c:4057
 rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6946
 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x219/0x270 net/socket.c:729
 ____sys_sendmsg+0x505/0x830 net/socket.c:2614
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3d0d78e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3d0b1b2038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3d0d9b6240 RCX: 00007f3d0d78e9a9
RDX: 0000000000000000 RSI: 0000200000000140 RDI: 0000000000000004
RBP: 00007f3d0d810d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3d0d9b6240 R15: 00007ffe505fca98
 </TASK>