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 ]------------
WARNING: CPU: 0 PID: 14543 at drivers/net/netdevsim/fib.c:831 nsim_fib6_event_init drivers/net/netdevsim/fib.c:831 [inline]
WARNING: CPU: 0 PID: 14543 at drivers/net/netdevsim/fib.c:831 nsim_fib6_prepare_event drivers/net/netdevsim/fib.c:947 [inline]
WARNING: CPU: 0 PID: 14543 at drivers/net/netdevsim/fib.c:831 nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:1003 [inline]
WARNING: CPU: 0 PID: 14543 at drivers/net/netdevsim/fib.c:831 nsim_fib_event_nb+0xf02/0x10b0 drivers/net/netdevsim/fib.c:1043
Modules linked in:
CPU: 0 UID: 0 PID: 14543 Comm: syz.0.2350 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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+0xf02/0x10b0 drivers/net/netdevsim/fib.c:1043
Code: 74 c8 5a fb be 01 00 00 00 4c 89 f7 e8 37 d2 1c fe 4c 8b 3c 24 49 bc 00 00 00 00 00 fc ff df e9 6c f4 ff ff e8 4f c8 5a fb 90 <0f> 0b 90 e9 40 fb ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 0d
RSP: 0018:ffffc90004b4efe8 EFLAGS: 00010287
RAX: ffffffff866434e1 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc9000cc81000 RSI: 00000000000009bd RDI: 00000000000009be
RBP: ffff88805aad5c18 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100b55ab86 R12: dffffc0000000000
R13: ffffc90004b4f160 R14: 0000000000000000 R15: ffff88805c153000
FS:  00007fd07cb966c0(0000) GS:ffff888126bc6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 0000000057de6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 notifier_call_chain+0x1b6/0x3e0 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+0xe6/0x150 net/ipv6/ip6_fib.c:425
 ip6_route_multipath_add net/ipv6/route.c:5525 [inline]
 inet6_rtm_newroute+0x125c/0x1830 net/ipv6/route.c:5647
 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6954
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x846/0xa10 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 ____sys_sendmsg+0x508/0x820 net/socket.c:2630
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684
 __sys_sendmsg net/socket.c:2716 [inline]
 __do_sys_sendmsg net/socket.c:2721 [inline]
 __se_sys_sendmsg net/socket.c:2719 [inline]
 __x64_sys_sendmsg+0x1a1/0x260 net/socket.c:2719
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd07e92efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd07cb96038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd07eb85fa0 RCX: 00007fd07e92efc9
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000000000000003
RBP: 00007fd07e9b1f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd07eb86038 R14: 00007fd07eb85fa0 R15: 00007ffc0a25d2a8
 </TASK>