------------[ cut here ]------------
WARNING: CPU: 1 PID: 15840 at net/ipv6/route.c:4857 rt6_multipath_rebalance+0x455/0x8b0 net/ipv6/route.c:4857
Modules linked in:
CPU: 1 UID: 0 PID: 15840 Comm: syz-executor Not tainted 6.17.0-rc1-syzkaller-00127-g715c7a36d59f #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 6d 9d f2 f7 e9 78 fe ff ff e8 a3 34 8f f7 eb 05 e8 9c 34 8f f7 90 <0f> 0b 90 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 d5 c4 4b 01
RSP: 0018:ffffc9000aba7120 EFLAGS: 00010293
RAX: ffffffff8a3076ed RBX: ffff88806ae9b800 RCX: ffff88806d6d0000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001574e1c R12: ffff88806ae9b8de
R13: ffff88806ae9b890 R14: 0000000000000000 R15: 1ffff1100d5d3712
FS:  0000000000000000(0000) GS:ffff888125d1c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4b812e7d60 CR3: 000000000df36000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 fib6_ifdown+0x401/0x4c0 net/ipv6/route.c:4977
 fib6_clean_node+0x24d/0x590 net/ipv6/ip6_fib.c:2246
 fib6_walk_continue+0x67b/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_down_dev net/ipv6/route.c:5005 [inline]
 rt6_disable_ip+0x120/0x720 net/ipv6/route.c:5010
 addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3853
 addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
 call_netdevice_notifiers net/core/dev.c:2281 [inline]
 netif_close_many+0x29c/0x410 net/core/dev.c:1784
 unregister_netdevice_many_notify+0x7b9/0x1ff0 net/core/dev.c:12124
 unregister_netdevice_many net/core/dev.c:12217 [inline]
 unregister_netdevice_queue+0x33c/0x380 net/core/dev.c:12061
 unregister_netdevice include/linux/netdevice.h:3385 [inline]
 __tun_detach+0xda4/0x1560 drivers/net/tun.c:621
 tun_detach drivers/net/tun.c:637 [inline]
 tun_chr_close+0x10a/0x1c0 drivers/net/tun.c:3433
 __fput+0x449/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6b5/0x2300 kernel/exit.c:961
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
 __do_sys_exit_group kernel/exit.c:1113 [inline]
 __se_sys_exit_group kernel/exit.c:1111 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
 x64_sys_call+0x21f7/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7f5d6b78ebe9
Code: Unable to access opcode bytes at 0x7f5d6b78ebbf.
RSP: 002b:00007ffcf0e21688 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f5d6b813653 RCX: 00007f5d6b78ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043
RBP: 00007f5d6b813665 R08: 00007ffcf0e1f427 R09: 00000000000927c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006
R13: 00000000000927c0 R14: 000000000006d093 R15: 00007ffcf0e21830
 </TASK>