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: drivers/net/netdevsim/fib.c:831 at nsim_fib6_event_init drivers/net/netdevsim/fib.c:831 [inline], CPU#1: syz.6.3531/17878
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib6_prepare_event drivers/net/netdevsim/fib.c:947 [inline], CPU#1: syz.6.3531/17878
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:1003 [inline], CPU#1: syz.6.3531/17878
WARNING: drivers/net/netdevsim/fib.c:831 at nsim_fib_event_nb+0xf02/0x10b0 drivers/net/netdevsim/fib.c:1043, CPU#1: syz.6.3531/17878
Modules linked in:
CPU: 1 UID: 0 PID: 17878 Comm: syz.6.3531 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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: 64 4c 5a fb be 01 00 00 00 4c 89 f7 e8 17 25 18 fe 4c 8b 3c 24 49 bc 00 00 00 00 00 fc ff df e9 6c f4 ff ff e8 3f 4c 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:ffffc90004eceee8 EFLAGS: 00010287
RAX: ffffffff86655ff1 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc9000dce1000 RSI: 0000000000000bf2 RDI: 0000000000000bf3
RBP: ffff88803ccf7018 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100799ee06 R12: dffffc0000000000
R13: ffffc90004ecf060 R14: 0000000000000000 R15: ffff888061bd4000
FS:  00007fd6e162e6c0(0000) GS:ffff888126def000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3764d2 CR3: 00000000a5b7e000 CR4: 00000000003526f0
DR0: 0000000000000001 DR1: fffffffffffffff7 DR2: 0000000000000000
DR3: 000000000000000a DR6: 00000000ffff0ff0 DR7: 0000000000000400
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+0xe6/0x150 net/ipv6/ip6_fib.c:425
 ip6_route_multipath_add net/ipv6/route.c:5536 [inline]
 inet6_rtm_newroute+0x125c/0x1830 net/ipv6/route.c:5658
 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x846/0xa10 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 ____sys_sendmsg+0x534/0x810 net/socket.c:2592
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646
 __sys_sendmmsg+0x22d/0x430 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+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd6e33cf749
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:00007fd6e162e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fd6e3625fa0 RCX: 00007fd6e33cf749
RDX: 040000000000009f RSI: 00002000000002c0 RDI: 0000000000000004
RBP: 00007fd6e3453f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd6e3626038 R14: 00007fd6e3625fa0 R15: 00007ffde7c7ad38
 </TASK>