------------[ cut here ]------------
WARNING: CPU: 1 PID: 3496 at net/ipv6/route.c:4793 rt6_multipath_first_sibling net/ipv6/route.c:4715 [inline]
WARNING: CPU: 1 PID: 3496 at net/ipv6/route.c:4793 rt6_multipath_rebalance+0x44d/0x8a0 net/ipv6/route.c:4792
Modules linked in:
CPU: 1 PID: 3496 Comm: kworker/u4:10 Not tainted 6.6.100-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
RIP: 0010:rt6_multipath_rebalance+0x44d/0x8a0 net/ipv6/route.c:4793
Code: e8 d8 88 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 7d 88 b1 f8 e9 78 fe ff ff e8 d3 42 5a f8 <0f> 0b eb 07 e8 ca 42 5a f8 0f 0b 48 83 c4 10 5b 41 5c 41 5d 41 5e
RSP: 0000:ffffc9000d187020 EFLAGS: 00010293
RAX: ffffffff892b52ad RBX: ffff88802dcc1c00 RCX: ffff88802e8c0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001a30dfc R12: ffff88802dcc1cbe
R13: ffff88802dcc1c80 R14: 0000000000000000 R15: 1ffff11005b98390
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d713ff8 CR3: 00000000657fb000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 fib6_ifdown+0x3f3/0x4b0 net/ipv6/route.c:4913
 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_down_dev net/ipv6/route.c:4941 [inline]
 rt6_disable_ip+0x125/0x7a0 net/ipv6/route.c:4946
 addrconf_ifdown+0x15e/0x1880 net/ipv6/addrconf.c:3826
 addrconf_notify+0x6c6/0x1010 net/ipv6/addrconf.c:-1
 notifier_call_chain+0x197/0x390 kernel/notifier.c:93
 call_netdevice_notifiers_extack net/core/dev.c:2064 [inline]
 call_netdevice_notifiers net/core/dev.c:2078 [inline]
 dev_close_many+0x297/0x400 net/core/dev.c:1619
 unregister_netdevice_many_notify+0x4c1/0x1810 net/core/dev.c:11047
 unregister_netdevice_many net/core/dev.c:11130 [inline]
 default_device_exit_batch+0x9cb/0xa60 net/core/dev.c:11608
 ops_exit_list net/core/net_namespace.c:178 [inline]
 cleanup_net+0x77f/0xb90 net/core/net_namespace.c:652
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>