------------[ cut here ]------------
i != fen6_info->nsiblings
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib_event_nb+0x1060/0x1210, CPU#1: syz.2.8804/6971
Modules linked in:
CPU: 1 UID: 0 PID: 6971 Comm: syz.2.8804 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:nsim_fib_event_nb+0x1060/0x1210
Code: 00 00 00 48 89 df e8 2f 1f 8e fd 49 bf 00 00 00 00 00 fc ff df 4c 8b 74 24 38 4c 8b 64 24 20 e9 1d f3 ff ff e8 81 82 a5 fa 90 <0f> 0b 90 e9 d3 f9 ff ff 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c b7 f0
RSP: 0018:ffffc9000f9aefc8 EFLAGS: 00010283
RAX: ffffffff8720092f RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90008425000 RSI: 00000000000009d5 RDI: 00000000000009d6
RBP: ffffc9000f9af160 R08: ffff88817642a82f R09: 1ffff1102ec85505
R10: dffffc0000000000 R11: ffffed102ec85506 R12: ffff88817642a818
R13: 0000000000000000 R14: ffffc9000f9af178 R15: dffffc0000000000
FS:  00007fa3309ae6c0(0000) GS:ffff8882a9464000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003ff6 CR3: 000000004fd20000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 notifier_call_chain+0x1be/0x400
 atomic_notifier_call_chain+0xda/0x180
 call_fib_notifiers+0x31/0x60
 call_fib6_multipath_entry_notifiers+0xf5/0x160
 inet6_rtm_newroute+0x14a2/0x19e0
 rtnetlink_rcv_msg+0x7d5/0xbe0
 netlink_rcv_skb+0x232/0x4b0
 netlink_unicast+0x80f/0x9b0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa32fb9c799
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:00007fa3309ae028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fa32fe15fa0 RCX: 00007fa32fb9c799
RDX: 0000000000040000 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007fa32fc32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa32fe16038 R14: 00007fa32fe15fa0 R15: 00007ffd5b130238
 </TASK>
