------------[ cut here ]------------
i != fen6_info->nsiblings
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib6_event_init drivers/net/netdevsim/fib.c:831 [inline], CPU#1: syz.1.673/8306
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib6_prepare_event drivers/net/netdevsim/fib.c:947 [inline], CPU#1: syz.1.673/8306
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:1003 [inline], CPU#1: syz.1.673/8306
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib_event_nb+0x1029/0x11d0 drivers/net/netdevsim/fib.c:1043, CPU#1: syz.1.673/8306
Modules linked in:
CPU: 1 UID: 0 PID: 8306 Comm: syz.1.673 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:nsim_fib6_event_init drivers/net/netdevsim/fib.c:831 [inline]
RIP: 0010:nsim_fib6_prepare_event drivers/net/netdevsim/fib.c:947 [inline]
RIP: 0010:nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:1003 [inline]
RIP: 0010:nsim_fib_event_nb+0x1029/0x11d0 drivers/net/netdevsim/fib.c:1043
Code: eb 0d 4d 89 fd e8 77 41 6d fa be 01 00 00 00 48 89 df e8 7a b4 85 fd 4d 89 ef 4c 8b 6c 24 20 e9 4a f3 ff ff e8 58 41 6d fa 90 <0f> 0b 90 e9 db fa ff ff 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c df f0
RSP: 0018:ffffc90007c06f10 EFLAGS: 00010293
RAX: ffffffff875acde8 RBX: 0000000000000002 RCX: ffff888037b55dc0
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffffc90007c070a0 R08: ffff88804a1cec2f R09: 1ffff11009439d85
R10: dffffc0000000000 R11: ffffed1009439d86 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000001 R15: ffff888055151000
FS:  00007f5fb94f46c0(0000) GS:ffff888123bbf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa88cfeb8c0 CR3: 000000007439a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:85
 atomic_notifier_call_chain+0xda/0x180 kernel/notifier.c:223
 call_fib_notifiers+0x31/0x60 net/core/fib_notifier.c:36
 call_fib6_multipath_entry_notifiers+0xf5/0x160 net/ipv6/ip6_fib.c:428
 ip6_route_multipath_add net/ipv6/route.c:5574 [inline]
 inet6_rtm_newroute+0x14f5/0x1a30 net/ipv6/route.c:5696
 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7137
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2575
 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline]
 netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1364
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800
 __sock_sendmsg net/socket.c:815 [inline]
 ____sys_sendmsg+0x54e/0x850 net/socket.c:2713
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2767
 __sys_sendmmsg+0x273/0x4d0 net/socket.c:2856
 __do_sys_sendmmsg net/socket.c:2883 [inline]
 __se_sys_sendmmsg net/socket.c:2880 [inline]
 __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2880
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5fb859e1d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5fb94f4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f5fb8825fa0 RCX: 00007f5fb859e1d9
RDX: 04000000000001f2 RSI: 0000200000000000 RDI: 0000000000000003
RBP: 00007f5fb8635888 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000000fc R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5fb8826038 R14: 00007f5fb8825fa0 R15: 00007ffed2485808
 </TASK>