Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 8323 Comm: syz.0.840 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:hlist_add_before_rcu include/linux/rculist.h:705 [inline]
RIP: 0010:xfrm_state_find+0x4c9b/0x5400 net/xfrm/xfrm_state.c:1574
Code: 00 00 00 00 00 fc ff df 80 3c 03 00 74 08 4c 89 ff e8 19 ae 01 f8 49 8b 1f 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 e7 ae 01 f8 4c 89 23 48 b8 00 00 00
RSP: 0018:ffffc9001d58eea0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: ffffc9000d7c0000 RSI: 000000000000031e RDI: 000000000000031f
RBP: ffffc9001d58f0c0 R08: ffff88802b923c00 R09: 0000000000000002
R10: 000000000000000a R11: 0000000000000002 R12: ffff8880557f1128
R13: ffff8880557f1100 R14: ffff8880557f08a8 R15: ffff8880557f1130
FS:  00007f3eb96ed6c0(0000) GS:ffff888125c12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000007fc0 CR3: 0000000077bca000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2522 [inline]
 xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2573 [inline]
 xfrm_resolve_and_create_bundle+0x768/0x2f80 net/xfrm/xfrm_policy.c:2871
 xfrm_lookup_with_ifid+0x2a7/0x1a70 net/xfrm/xfrm_policy.c:3205
 xfrm_lookup net/xfrm/xfrm_policy.c:3336 [inline]
 xfrm_lookup_route+0x3c/0x1c0 net/xfrm/xfrm_policy.c:3347
 udp_sendmsg+0x142e/0x2170 net/ipv4/udp.c:1450
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x19c/0x270 net/socket.c:729
 ____sys_sendmsg+0x52d/0x830 net/socket.c:2614
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
 __sys_sendmmsg+0x227/0x430 net/socket.c:2757
 __do_sys_sendmmsg net/socket.c:2784 [inline]
 __se_sys_sendmmsg net/socket.c:2781 [inline]
 __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2781
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3eb878eec9
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:00007f3eb96ed038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f3eb89e6090 RCX: 00007f3eb878eec9
RDX: 000000000800001d RSI: 0000200000007fc0 RDI: 0000000000000003
RBP: 00007f3eb8811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3eb89e6128 R14: 00007f3eb89e6090 R15: 00007f3eb8b0fa28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hlist_add_before_rcu include/linux/rculist.h:705 [inline]
RIP: 0010:xfrm_state_find+0x4c9b/0x5400 net/xfrm/xfrm_state.c:1574
Code: 00 00 00 00 00 fc ff df 80 3c 03 00 74 08 4c 89 ff e8 19 ae 01 f8 49 8b 1f 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 e7 ae 01 f8 4c 89 23 48 b8 00 00 00
RSP: 0018:ffffc9001d58eea0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: ffffc9000d7c0000 RSI: 000000000000031e RDI: 000000000000031f
RBP: ffffc9001d58f0c0 R08: ffff88802b923c00 R09: 0000000000000002
R10: 000000000000000a R11: 0000000000000002 R12: ffff8880557f1128
R13: ffff8880557f1100 R14: ffff8880557f08a8 R15: ffff8880557f1130
FS:  00007f3eb96ed6c0(0000) GS:ffff888125c12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000007fc0 CR3: 0000000077bca000 CR4: 00000000003526f0
----------------
Code disassembly (best guess), 7 bytes skipped:
   0:	df 80 3c 03 00 74    	filds  0x7400033c(%rax)
   6:	08 4c 89 ff          	or     %cl,-0x1(%rcx,%rcx,4)
   a:	e8 19 ae 01 f8       	call   0xf801ae28
   f:	49 8b 1f             	mov    (%r15),%rbx
  12:	48 89 d8             	mov    %rbx,%rax
  15:	48 c1 e8 03          	shr    $0x3,%rax
  19:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  20:	fc ff df
* 23:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  27:	74 08                	je     0x31
  29:	48 89 df             	mov    %rbx,%rdi
  2c:	e8 e7 ae 01 f8       	call   0xf801af18
  31:	4c 89 23             	mov    %r12,(%rbx)
  34:	48                   	rex.W
  35:	b8                   	.byte 0xb8
  36:	00 00                	add    %al,(%rax)