------------[ cut here ]------------
WARNING: CPU: 0 PID: 13350 at net/ipv6/route.c:4856 rt6_multipath_rebalance+0x455/0x8b0 net/ipv6/route.c:4856
Modules linked in:
CPU: 0 UID: 0 PID: 13350 Comm: syz.4.2249 Not tainted 6.16.0-rc1-syzkaller-00005-g488ef3560196 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:rt6_multipath_rebalance+0x455/0x8b0 net/ipv6/route.c:4856
Code: ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 85 fe ff ff 4c 89 e7 e8 4d 83 0b f8 e9 78 fe ff ff e8 23 37 aa f7 eb 05 e8 1c 37 aa f7 90 <0f> 0b 90 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc
RSP: 0018:ffffc900047be660 EFLAGS: 00010287
RAX: ffffffff8a1616cd RBX: ffff888058480400 RCX: 0000000000080000
RDX: ffffc9000d33c000 RSI: 0000000000036b77 RDI: 0000000000036b78
RBP: dffffc0000000000 R08: ffff8880248e0000 R09: 0000000000000003
R10: 0000000000000006 R11: 0000000000000002 R12: ffff8880584804de
R13: ffff888058480490 R14: 0000000000000000 R15: 1ffff1100b090092
FS:  00007f3be92a26c0(0000) GS:ffff888125c86000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2dd575 CR3: 0000000077cb6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 fib6_ifdown+0x2fe/0x4c0 net/ipv6/route.c:4984
 fib6_clean_node+0x24d/0x590 net/ipv6/ip6_fib.c:2252
 fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2177
 fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2225
 fib6_clean_tree net/ipv6/ip6_fib.c:2305 [inline]
 __fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2321
 rt6_sync_down_dev+0xf9/0x150 net/ipv6/route.c:5004
 addrconf_notify+0x929/0x1010 net/ipv6/addrconf.c:3717
 notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
 netif_state_change+0x284/0x3a0 net/core/dev.c:1584
 do_setlink+0x35de/0x41c0 net/core/rtnetlink.c:3388
 rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3927 [inline]
 rtnl_newlink+0x149f/0x1c70 net/core/rtnetlink.c:4055
 rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6944
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2534
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x75b/0x8d0 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x219/0x270 net/socket.c:727
 ____sys_sendmsg+0x505/0x830 net/socket.c:2566
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620
 __sys_sendmsg net/socket.c:2652 [inline]
 __do_sys_sendmsg net/socket.c:2657 [inline]
 __se_sys_sendmsg net/socket.c:2655 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655
 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: 0033:0x7f3be838e929
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:00007f3be92a2038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3be85b5fa0 RCX: 00007f3be838e929
RDX: 0000000000000080 RSI: 0000200000000240 RDI: 0000000000000007
RBP: 00007f3be8410b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3be85b5fa0 R15: 00007ffd9f882728
 </TASK>