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: 6333 at drivers/net/netdevsim/fib.c:831 nsim_fib6_event_init drivers/net/netdevsim/fib.c:831 [inline]
WARNING: CPU: 1 PID: 6333 at drivers/net/netdevsim/fib.c:831 nsim_fib6_prepare_event drivers/net/netdevsim/fib.c:947 [inline]
WARNING: CPU: 1 PID: 6333 at drivers/net/netdevsim/fib.c:831 nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:1003 [inline]
WARNING: CPU: 1 PID: 6333 at drivers/net/netdevsim/fib.c:831 nsim_fib_event_nb+0xb9d/0x10d0 drivers/net/netdevsim/fib.c:1043
Modules linked in:
CPU: 1 UID: 0 PID: 6333 Comm: syz.3.102 Not tainted syzkaller #0 PREEMPT(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+0xb9d/0x10d0 drivers/net/netdevsim/fib.c:1043
Code: 24 20 48 8b 6c 24 38 e8 f1 76 c3 fa e8 ec 76 c3 fa 89 de 44 89 ef e8 62 71 c3 fa 41 39 dd 0f 84 cb fd ff ff e8 d4 76 c3 fa 90 <0f> 0b 90 e9 bd fd ff ff e8 c6 76 c3 fa 48 8d 7d 38 be 01 00 00 00
RSP: 0018:ffffc9000418f128 EFLAGS: 00010287
RAX: 000000000000b3de RBX: ffff888056fa782c RCX: ffffc9000cb3a000
RDX: 0000000000080000 RSI: ffffffff86f9c1dc RDI: ffff888056fa7818
RBP: ffff8880289ba000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffc9000418f280
R13: 0000000000000001 R14: ffff88807cfb3300 R15: ffff888056fa7800
FS:  00007fa2644bb6c0(0000) GS:ffff888124ad6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f569ab156c0 CR3: 00000000793c4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 notifier_call_chain+0xbc/0x410 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+0xb4f/0x1bd0 net/ipv6/route.c:5525
 inet6_rtm_newroute+0xe4/0x1a0 net/ipv6/route.c:5647
 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6954
 netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xa98/0xc70 net/socket.c:2630
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2684
 __sys_sendmsg+0x16d/0x220 net/socket.c:2716
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa26358efc9
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:00007fa2644bb038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fa2637e5fa0 RCX: 00007fa26358efc9
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000000000000003
RBP: 00007fa263611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa2637e6038 R14: 00007fa2637e5fa0 R15: 00007ffc01b2ca48
 </TASK>