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: 8673 Comm: syz.0.692 Not tainted 6.16.0-syzkaller-06574-gd9104cec3e8f #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:hlist_add_before_rcu include/linux/rculist.h:705 [inline] RIP: 0010:__xfrm_state_insert+0x1011/0x1450 net/xfrm/xfrm_state.c:1743 Code: 18 00 74 08 4c 89 ef e8 3d 62 0b f8 4d 89 65 00 41 80 3c 1e 00 74 08 48 89 ef e8 3a 61 0b f8 4c 8b 75 00 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 11 62 0b f8 4d 89 2e 41 80 3c 1f 00 RSP: 0018:ffffc9001d25f130 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000080000 RDX: ffffc9000be1a000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffff888058306230 R08: ffff88802d855a00 R09: 0000000000000002 R10: 000000000000000a R11: 0000000000000002 R12: ffff8880330e8028 R13: ffff888058306228 R14: 0000000000000000 R15: 1ffff1100661d006 FS: 00007f870adfd6c0(0000) GS:ffff888125c80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c35d9db CR3: 0000000055674000 CR4: 00000000003526f0 Call Trace: xfrm_state_add+0x564/0xc40 net/xfrm/xfrm_state.c:1924 xfrm_add_sa+0x35a1/0x4070 net/xfrm/xfrm_user.c:1025 xfrm_user_rcv_msg+0x7a3/0xab0 net/xfrm/xfrm_user.c:3501 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552 xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3523 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 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: 0033:0x7f8709f8ebe9 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:00007f870adfd038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f870a1b5fa0 RCX: 00007f8709f8ebe9 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000004 RBP: 00007f870a011e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f870a1b6038 R14: 00007f870a1b5fa0 R15: 00007ffca542b5b8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hlist_add_before_rcu include/linux/rculist.h:705 [inline] RIP: 0010:__xfrm_state_insert+0x1011/0x1450 net/xfrm/xfrm_state.c:1743 Code: 18 00 74 08 4c 89 ef e8 3d 62 0b f8 4d 89 65 00 41 80 3c 1e 00 74 08 48 89 ef e8 3a 61 0b f8 4c 8b 75 00 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 11 62 0b f8 4d 89 2e 41 80 3c 1f 00 RSP: 0018:ffffc9001d25f130 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000080000 RDX: ffffc9000be1a000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffff888058306230 R08: ffff88802d855a00 R09: 0000000000000002 R10: 000000000000000a R11: 0000000000000002 R12: ffff8880330e8028 R13: ffff888058306228 R14: 0000000000000000 R15: 1ffff1100661d006 FS: 00007f870adfd6c0(0000) GS:ffff888125c80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c35d9db CR3: 0000000055674000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 18 00 sbb %al,(%rax) 2: 74 08 je 0xc 4: 4c 89 ef mov %r13,%rdi 7: e8 3d 62 0b f8 call 0xf80b6249 c: 4d 89 65 00 mov %r12,0x0(%r13) 10: 41 80 3c 1e 00 cmpb $0x0,(%r14,%rbx,1) 15: 74 08 je 0x1f 17: 48 89 ef mov %rbp,%rdi 1a: e8 3a 61 0b f8 call 0xf80b6159 1f: 4c 8b 75 00 mov 0x0(%rbp),%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 f7 mov %r14,%rdi 33: e8 11 62 0b f8 call 0xf80b6249 38: 4d 89 2e mov %r13,(%r14) 3b: 41 80 3c 1f 00 cmpb $0x0,(%r15,%rbx,1)