------------[ cut here ]------------
WARNING: CPU: 0 PID: 19810 at net/ipv6/route.c:4857 rt6_multipath_rebalance+0x455/0x8b0
Modules linked in:
CPU: 0 UID: 0 PID: 19810 Comm: syz.0.3729 Not tainted 6.16.0-syzkaller-12063-g37816488247d-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:rt6_multipath_rebalance+0x455/0x8b0
Code: ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 85 fe ff ff 4c 89 e7 e8 0d 33 f3 f7 e9 78 fe ff ff e8 f3 c8 8f f7 eb 05 e8 ec c8 8f f7 90 <0f> 0b 90 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 05 b9 4b 01
RSP: 0018:ffffc90003e8e3c0 EFLAGS: 00010293
RAX: ffffffff8a2fe2bd RBX: ffff888023153c00 RCX: ffff88801ff65640
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520007d1c70 R12: ffff888023153cde
R13: ffff888023153c90 R14: 0000000000000000 R15: 1ffff1100462a792
FS:  00007f390ecb36c0(0000) GS:ffff8880b8621000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa254db7dac CR3: 000000002895a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 fib6_ifdown+0x401/0x4c0
 fib6_clean_node+0x24d/0x590
 fib6_walk_continue+0x67b/0x910
 fib6_walk+0x149/0x290
 __fib6_clean_all+0x234/0x380
 rt6_disable_ip+0x120/0x720
 addrconf_ifdown+0x15d/0x1880
 addrconf_notify+0x1bc/0x1010
 notifier_call_chain+0x1b6/0x3e0
 __dev_notify_flags+0x18d/0x2e0
 netif_change_flags+0xe8/0x1a0
 do_setlink+0xc55/0x41c0
 rtnl_newlink+0x149f/0x1c70
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x82f/0x9e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f390dd8ebe9
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:00007f390ecb3038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f390dfb5fa0 RCX: 00007f390dd8ebe9
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000000000000005
RBP: 00007f390de11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f390dfb6038 R14: 00007f390dfb5fa0 R15: 00007ffdcd3ae1e8
 </TASK>
