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: 1 PID: 5554 at drivers/net/netdevsim/fib.c:831 nsim_fib6_event_init drivers/net/netdevsim/fib.c:831 [inline]
WARNING: CPU: 1 PID: 5554 at drivers/net/netdevsim/fib.c:831 nsim_fib6_prepare_event drivers/net/netdevsim/fib.c:947 [inline]
WARNING: CPU: 1 PID: 5554 at drivers/net/netdevsim/fib.c:831 nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:1003 [inline]
WARNING: CPU: 1 PID: 5554 at drivers/net/netdevsim/fib.c:831 nsim_fib_event_nb+0xa9a/0xb10 drivers/net/netdevsim/fib.c:1043
Modules linked in:
CPU: 1 UID: 0 PID: 5554 Comm: syz.2.16 Not tainted 6.15.0-rc2-syzkaller #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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+0xa9a/0xb10 drivers/net/netdevsim/fib.c:1043
Code: e8 eb 64 98 fe be 02 00 00 00 eb 0a e8 df 64 98 fe be 01 00 00 00 49 8d 7e 2c e8 c1 55 46 ff e9 8e f7 ff ff e8 c7 64 98 fe 90 <0f> 0b 90 e9 e9 fc ff ff e8 b9 64 98 fe e9 5b fa ff ff e8 af 64 98
RSP: 0018:ffffc900019a36a8 EFLAGS: 00010293
RAX: ffffffff82c253f9 RBX: ffff8881087113c0 RCX: ffff88816a20b780
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000920 R09: 00000000ffffffff
R10: ffff88817b4ac7e0 R11: 0000000000000000 R12: ffffc900019a37b0
R13: 0000000000000002 R14: ffff888109fa2a18 R15: 0000000000000001
FS:  00007f08ce4306c0(0000) GS:ffff8882b121a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000380 CR3: 00000001668e8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 notifier_call_chain+0xfa/0x2a0 kernel/notifier.c:85
 atomic_notifier_call_chain+0x60/0x90 kernel/notifier.c:223
 call_fib_notifiers+0x82/0xc0 net/core/fib_notifier.c:35
 call_fib6_multipath_entry_notifiers+0x65/0x90 net/ipv6/ip6_fib.c:413
 ip6_route_multipath_add net/ipv6/route.c:5470 [inline]
 inet6_rtm_newroute+0x70a/0xbc0 net/ipv6/route.c:5592
 rtnetlink_rcv_msg+0x583/0x610 net/core/rtnetlink.c:6964
 netlink_rcv_skb+0xea/0x1c0 net/netlink/af_netlink.c:2534
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x3ca/0x4a0 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x489/0x590 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0xc6/0xf0 net/socket.c:727
 ____sys_sendmsg+0x262/0x3c0 net/socket.c:2566
 ___sys_sendmsg+0x2de/0x320 net/socket.c:2620
 __sys_sendmsg net/socket.c:2652 [inline]
 __do_sys_sendmsg net/socket.c:2657 [inline]
 __se_sys_sendmsg net/socket.c:2655 [inline]
 __x64_sys_sendmsg+0x110/0x1a0 net/socket.c:2655
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f08cd58e969
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:00007f08ce430038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f08cd7b5fa0 RCX: 00007f08cd58e969
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000000000000003
RBP: 00007f08cd610ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f08cd7b5fa0 R15: 00007ffccaa22ea8
 </TASK>