IPv6: RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE
IPv6: NLM_F_CREATE should be set when creating new route
IPv6: NLM_F_CREATE should be set when creating new route
------------[ 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.3.3858/21146
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib6_prepare_event drivers/net/netdevsim/fib.c:947 [inline], CPU#0: syz.3.3858/21146
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:1003 [inline], CPU#0: syz.3.3858/21146
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib_event_nb+0x1060/0x1210 drivers/net/netdevsim/fib.c:1043, CPU#0: syz.3.3858/21146
Modules linked in:
CPU: 0 UID: 0 PID: 21146 Comm: syz.3.3858 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+0x1060/0x1210 drivers/net/netdevsim/fib.c:1043
Code: 00 00 00 48 89 df e8 df 78 90 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 a1 49 b4 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:ffffc90004d26ed0 EFLAGS: 00010293
RAX: ffffffff87102d5f RBX: 0000000000000002 RCX: ffff888055651e80
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffffc90004d27060 R08: ffff88807542cc2f R09: 1ffff1100ea85985
R10: dffffc0000000000 R11: ffffed100ea85986 R12: ffff88807deadc18
R13: 0000000000000001 R14: ffffc90004d27078 R15: dffffc0000000000
FS:  00007fe0f2b726c0(0000) GS:ffff8881256f3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f16eb7e2e9c CR3: 00000000503ce000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85
 atomic_notifier_call_chain+0xda/0x180 kernel/notifier.c:223
 call_fib_notifiers+0x31/0x60 net/core/fib_notifier.c:35
 call_fib6_multipath_entry_notifiers+0xf5/0x160 net/ipv6/ip6_fib.c:425
 ip6_route_multipath_add net/ipv6/route.c:5533 [inline]
 inet6_rtm_newroute+0x14a2/0x19e0 net/ipv6/route.c:5655
 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958
 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
 __sys_sendmmsg+0x27c/0x4e0 net/socket.c:2735
 __do_sys_sendmmsg net/socket.c:2762 [inline]
 __se_sys_sendmmsg net/socket.c:2759 [inline]
 __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2759
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe0f1d9aeb9
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:00007fe0f2b72028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fe0f2016090 RCX: 00007fe0f1d9aeb9
RDX: 040000000000009f RSI: 00002000000002c0 RDI: 0000000000000009
RBP: 00007fe0f1e08c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe0f2016128 R14: 00007fe0f2016090 R15: 00007fff754bcf68
 </TASK>