------------[ cut here ]------------
WARNING: CPU: 1 PID: 12512 at net/ipv6/route.c:4793 rt6_multipath_first_sibling net/ipv6/route.c:4715 [inline]
WARNING: CPU: 1 PID: 12512 at net/ipv6/route.c:4793 rt6_multipath_rebalance+0x44d/0x8a0 net/ipv6/route.c:4792
Modules linked in:
CPU: 1 PID: 12512 Comm: syz.6.1345 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:rt6_multipath_rebalance+0x44d/0x8a0 net/ipv6/route.c:4793
Code: e8 28 81 b1 f8 e9 1c fe ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 85 fe ff ff 4c 89 e7 e8 cd 80 b1 f8 e9 78 fe ff ff e8 23 3b 5a f8 <0f> 0b eb 07 e8 1a 3b 5a f8 0f 0b 48 83 c4 10 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90004a26660 EFLAGS: 00010287
RAX: ffffffff892b5a6d RBX: ffff88805ab08400 RCX: 0000000000080000
RDX: ffffc9001bc2b000 RSI: 00000000000038f2 RDI: 00000000000038f3
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000944cc4 R12: ffff88805d0e04be
R13: ffff88805ab08480 R14: 0000000000000000 R15: 1ffff1100b561090
FS:  00007fa0061de6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000007d6000 CR3: 0000000058e5a000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 fib6_ifup+0x14a/0x180 net/ipv6/route.c:4809
 fib6_clean_node+0x248/0x580 net/ipv6/ip6_fib.c:2190
 fib6_walk_continue+0x672/0x900 net/ipv6/ip6_fib.c:2115
 fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2163
 fib6_clean_tree net/ipv6/ip6_fib.c:2243 [inline]
 __fib6_clean_all+0x235/0x380 net/ipv6/ip6_fib.c:2259
 rt6_sync_up+0x126/0x160 net/ipv6/route.c:4827
 addrconf_notify+0xd68/0x1010 net/ipv6/addrconf.c:3701
 notifier_call_chain+0x197/0x390 kernel/notifier.c:93
 netdev_state_change+0xd6/0x150 net/core/dev.c:1408
 do_setlink+0x3cb/0x3fb0 net/core/rtnetlink.c:3147
 rtnl_group_changelink net/core/rtnetlink.c:3454 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3713 [inline]
 rtnl_newlink+0x10af/0x2020 net/core/rtnetlink.c:3750
 rtnetlink_rcv_msg+0x7c7/0xf10 net/core/rtnetlink.c:6475
 netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2555
 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
 netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1356
 netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1904
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
 ___sys_sendmsg+0x220/0x290 net/socket.c:2649
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2687 [inline]
 __se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa00638eb69
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:00007fa0061de038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fa0065b6320 RCX: 00007fa00638eb69
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000008
RBP: 00007fa006411df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa0065b6320 R15: 00007ffdb4541068
 </TASK>