general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 12455 Comm: syz.1.2002 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:hlist_add_before_rcu include/linux/rculist.h:656 [inline] RIP: 0010:__xfrm_state_insert+0x1250/0x1700 net/xfrm/xfrm_state.c:1512 Code: 00 00 00 00 00 fc ff df 80 3c 03 00 74 08 4c 89 ff e8 d4 2d bf 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 52 2e bf f8 4c 89 2b 48 b8 00 00 00 RSP: 0018:ffffc900052174e0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffffc90010833000 RSI: 00000000000249b0 RDI: 00000000000249b1 RBP: 1ffff1100bac0906 R08: dffffc0000000000 R09: 0000000000000002 R10: 000000000000000a R11: 0000000000000002 R12: ffff88805d604828 R13: ffff88805d605428 R14: ffff88805d605400 R15: ffff88805d605430 FS: 00007fb3a7ca06c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb34b3912f8 CR3: 0000000060c36000 CR4: 00000000003506e0 Call Trace: xfrm_state_insert+0x54/0x60 net/xfrm/xfrm_state.c:1561 ipcomp6_tunnel_attach net/ipv6/ipcomp6.c:129 [inline] ipcomp6_init_state+0x5ab/0x7f0 net/ipv6/ipcomp6.c:161 __xfrm_init_state+0xd8b/0x11c0 net/xfrm/xfrm_state.c:2904 xfrm_init_state+0x1f/0x80 net/xfrm/xfrm_state.c:2932 pfkey_msg2xfrm_state net/key/af_key.c:1286 [inline] pfkey_add+0x1cee/0x2da0 net/key/af_key.c:1503 pfkey_process net/key/af_key.c:2847 [inline] pfkey_sendmsg+0xbed/0x1050 net/key/af_key.c:3698 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x5bf/0x950 net/socket.c:2595 ___sys_sendmsg+0x220/0x290 net/socket.c:2649 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2687 [inline] __se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fb3a6d8ebe9 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:00007fb3a7ca0038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb3a6fc6180 RCX: 00007fb3a6d8ebe9 RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 000000000000000c RBP: 00007fb3a6e11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb3a6fc6218 R14: 00007fb3a6fc6180 R15: 00007ffc4b844088 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hlist_add_before_rcu include/linux/rculist.h:656 [inline] RIP: 0010:__xfrm_state_insert+0x1250/0x1700 net/xfrm/xfrm_state.c:1512 Code: 00 00 00 00 00 fc ff df 80 3c 03 00 74 08 4c 89 ff e8 d4 2d bf 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 52 2e bf f8 4c 89 2b 48 b8 00 00 00 RSP: 0018:ffffc900052174e0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffffc90010833000 RSI: 00000000000249b0 RDI: 00000000000249b1 RBP: 1ffff1100bac0906 R08: dffffc0000000000 R09: 0000000000000002 R10: 000000000000000a R11: 0000000000000002 R12: ffff88805d604828 R13: ffff88805d605428 R14: ffff88805d605400 R15: ffff88805d605430 FS: 00007fb3a7ca06c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb34b3912f8 CR3: 0000000060c36000 CR4: 00000000003506e0 ---------------- 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 d4 2d bf f8 call 0xf8bf2de3 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 52 2e bf f8 call 0xf8bf2e83 31: 4c 89 2b mov %r13,(%rbx) 34: 48 rex.W 35: b8 .byte 0xb8 36: 00 00 add %al,(%rax)