------------[ 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#0: syz.2.262/6890
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib6_prepare_event drivers/net/netdevsim/fib.c:947 [inline], CPU#0: syz.2.262/6890
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:1003 [inline], CPU#0: syz.2.262/6890
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib_event_nb+0xbc1/0xe40 drivers/net/netdevsim/fib.c:1043, CPU#0: syz.2.262/6890
Modules linked in:
CPU: 0 UID: 0 PID: 6890 Comm: syz.2.262 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
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+0xbc1/0xe40 drivers/net/netdevsim/fib.c:1043
Code: 20 48 8b 6c 24 28 e8 ce 61 dd fa e8 c9 61 dd fa 44 89 fe 44 89 ef e8 ae 5b dd fa 45 39 fd 0f 84 6a fd ff ff e8 b0 61 dd fa 90 <0f> 0b 90 e9 5c fd ff ff e8 a2 61 dd fa 48 c7 c7 00 b1 5b 8c e8 96
RSP: 0018:ffffc9001b80f020 EFLAGS: 00010283
RAX: 0000000000000989 RBX: ffffc9001b80f160 RCX: ffffc90004e62000
RDX: 0000000000080000 RSI: ffffffff87299e50 RDI: ffff888059230018
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff8b762149 R12: ffff888058e80000
R13: 0000000000000001 R14: ffff88805ace1600 R15: ffff888059230000
FS:  00007fc85af3f6c0(0000) GS:ffff8881245dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c334687 CR3: 0000000075d6f000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 notifier_call_chain+0x99/0x3b0 kernel/notifier.c:85
 atomic_notifier_call_chain+0x71/0x1c0 kernel/notifier.c:223
 call_fib_notifiers+0x33/0x70 net/core/fib_notifier.c:35
 call_fib6_multipath_entry_notifiers+0x112/0x170 net/ipv6/ip6_fib.c:425
 ip6_route_multipath_add+0x128f/0x1ba0 net/ipv6/route.c:5536
 inet6_rtm_newroute+0xf5/0x160 net/ipv6/route.c:5658
 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6958
 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xa54/0xc30 net/socket.c:2592
 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2646
 __sys_sendmmsg+0x205/0x430 net/socket.c:2735
 __do_sys_sendmmsg net/socket.c:2762 [inline]
 __se_sys_sendmmsg net/socket.c:2759 [inline]
 __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2759
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc859f9acb9
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:00007fc85af3f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fc85a215fa0 RCX: 00007fc859f9acb9
RDX: 04000000000001f2 RSI: 0000200000000000 RDI: 0000000000000009
RBP: 00007fc85a008bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000000fc R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc85a216038 R14: 00007fc85a215fa0 R15: 00007ffd6ee65978
 </TASK>