------------[ 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#2: syz.9.2977/16425
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib6_prepare_event drivers/net/netdevsim/fib.c:947 [inline], CPU#2: syz.9.2977/16425
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:1003 [inline], CPU#2: syz.9.2977/16425
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib_event_nb+0xbc1/0xe40 drivers/net/netdevsim/fib.c:1043, CPU#2: syz.9.2977/16425
Modules linked in:
CPU: 2 UID: 0 PID: 16425 Comm: syz.9.2977 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
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 ee 60 dd fa e8 e9 60 dd fa 44 89 fe 44 89 ef e8 ce 5a dd fa 45 39 fd 0f 84 6a fd ff ff e8 d0 60 dd fa 90 <0f> 0b 90 e9 5c fd ff ff e8 c2 60 dd fa 48 c7 c7 00 b1 5b 8c e8 96
RSP: 0018:ffffc90006f6f130 EFLAGS: 00010283
RAX: 0000000000005258 RBX: ffffc90006f6f270 RCX: ffffc90029150000
RDX: 0000000000080000 RSI: ffffffff87299a90 RDI: ffff88805c534818
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888012670000
R13: 0000000000000001 R14: ffff888050e9c200 R15: ffff88805c534800
FS:  00007f7c797f56c0(0000) GS:ffff8880d67dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2ca095 CR3: 000000004ef6c000 CR4: 0000000000352ef0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
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_sendmsg+0x170/0x220 net/socket.c:2678
 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: 0033:0x7f7c7899acb9
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:00007f7c797f5028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f7c78c15fa0 RCX: 00007f7c7899acb9
RDX: 0000000000040000 RSI: 0000200000000000 RDI: 0000000000000006
RBP: 00007f7c78a08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7c78c16038 R14: 00007f7c78c15fa0 R15: 00007ffc4882a168
 </TASK>