RSP: 002b:00007fdba0da6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fdba2964fa0 RCX: 00007fdba273d969 RDX: 0000000000004000 RSI: 00002000000001c0 RDI: 0000000000000003 RBP: 00007fdba0da6090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007fdba2964fa0 R15: 00007ffe27976338 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 4155 Comm: syz.3.996 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:nexthop_create_group net/ipv4/nexthop.c:1135 [inline] RIP: 0010:nexthop_add net/ipv4/nexthop.c:1320 [inline] RIP: 0010:rtm_new_nexthop+0x129d/0x4b90 net/ipv4/nexthop.c:1519 Code: 00 80 3c 01 00 74 0a 48 8b 7c 24 18 e8 0c f4 ef fd 48 8b 44 24 18 48 89 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 e5 f3 ef fd 48 8b 44 24 18 48 89 03 RSP: 0018:ffff8881eee07100 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881f5c02a00 RBP: ffff8881eee074f0 R08: dffffc0000000000 R09: fffffbfff0baeb67 R10: fffffbfff0baeb67 R11: 1ffffffff0baeb66 R12: ffff8881eee07880 R13: 0000000000010001 R14: ffff8881f1dc2800 R15: dffffc0000000000 FS: 00007fdba0da66c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fad0ede003e CR3: 00000001ea884000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rtnetlink_rcv_msg+0xa23/0xbe0 net/core/rtnetlink.c:5290 netlink_rcv_skb+0x1e6/0x430 net/netlink/af_netlink.c:2467 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5308 netlink_unicast_kernel net/netlink/af_netlink.c:1306 [inline] netlink_unicast+0x88b/0xa40 net/netlink/af_netlink.c:1332 netlink_sendmsg+0x88d/0xb30 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec net/socket.c:638 [inline] __sock_sendmsg net/socket.c:650 [inline] ____sys_sendmsg+0x57b/0x8d0 net/socket.c:2306 ___sys_sendmsg net/socket.c:2360 [inline] __sys_sendmsg+0x28e/0x360 net/socket.c:2406 __do_sys_sendmsg net/socket.c:2415 [inline] __se_sys_sendmsg net/socket.c:2413 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2413 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7fdba273d969 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:00007fdba0da6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fdba2964fa0 RCX: 00007fdba273d969 RDX: 0000000000004000 RSI: 00002000000001c0 RDI: 0000000000000003 RBP: 00007fdba0da6090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007fdba2964fa0 R15: 00007ffe27976338 Modules linked in: ---[ end trace 669e6f185541d677 ]--- RIP: 0010:nexthop_create_group net/ipv4/nexthop.c:1135 [inline] RIP: 0010:nexthop_add net/ipv4/nexthop.c:1320 [inline] RIP: 0010:rtm_new_nexthop+0x129d/0x4b90 net/ipv4/nexthop.c:1519 Code: 00 80 3c 01 00 74 0a 48 8b 7c 24 18 e8 0c f4 ef fd 48 8b 44 24 18 48 89 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 e5 f3 ef fd 48 8b 44 24 18 48 89 03 RSP: 0018:ffff8881eee07100 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881f5c02a00 RBP: ffff8881eee074f0 R08: dffffc0000000000 R09: fffffbfff0baeb67 R10: fffffbfff0baeb67 R11: 1ffffffff0baeb66 R12: ffff8881eee07880 R13: 0000000000010001 R14: ffff8881f1dc2800 R15: dffffc0000000000 FS: 00007fdba0da66c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31b1fffc CR3: 00000001ea884000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 80 3c 01 00 74 add %al,0x7400013c(%rax) 6: 0a 48 8b or -0x75(%rax),%cl 9: 7c 24 jl 0x2f b: 18 e8 sbb %ch,%al d: 0c f4 or $0xf4,%al f: ef out %eax,(%dx) 10: fd std 11: 48 8b 44 24 18 mov 0x18(%rsp),%rax 16: 48 89 18 mov %rbx,(%rax) 19: 48 89 d8 mov %rbx,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 df mov %rbx,%rdi 33: e8 e5 f3 ef fd call 0xfdeff41d 38: 48 8b 44 24 18 mov 0x18(%rsp),%rax 3d: 48 89 03 mov %rax,(%rbx)