Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 15854 Comm: syz.3.2422 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_insert+0x1710/0x2510 net/xfrm/xfrm_state.c:1743 Code: 00 fc ff df 4c 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 96 0d 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 7b 30 4c 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 6a 0d 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 RSP: 0018:ffffc9001be4f288 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff888057994880 RCX: 1ffff1100af32915 RDX: 0000000000000000 RSI: 1ffff1100af32916 RDI: 0000000000000001 RBP: ffff888077d6c880 R08: 0000000000000001 R09: 0000000000000008 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888057994440 R13: ffff8880579948a8 R14: ffff888057994470 R15: 0000000000000000 FS: 00007f01ac21a6c0(0000) GS:ffff8881247b2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000009b48 CR3: 000000007c37a000 CR4: 00000000003526f0 Call Trace: xfrm_state_insert+0x4c/0x60 net/xfrm/xfrm_state.c:1795 ipcomp6_tunnel_attach net/ipv6/ipcomp6.c:131 [inline] ipcomp6_init_state net/ipv6/ipcomp6.c:163 [inline] ipcomp6_init_state+0x608/0x8d0 net/ipv6/ipcomp6.c:141 __xfrm_init_state+0x6fe/0x1c10 net/xfrm/xfrm_state.c:3188 xfrm_state_construct net/xfrm/xfrm_user.c:954 [inline] xfrm_add_sa+0x2ec8/0x5c50 net/xfrm/xfrm_user.c:1019 xfrm_user_rcv_msg+0x58b/0xc00 net/xfrm/xfrm_user.c:3501 netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2552 xfrm_netlink_rcv+0x71/0x90 net/xfrm/xfrm_user.c:3523 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg net/socket.c:729 [inline] ____sys_sendmsg+0xa98/0xc70 net/socket.c:2614 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2668 __sys_sendmsg+0x16d/0x220 net/socket.c:2700 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f01ab38eec9 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:00007f01ac21a038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f01ab5e6090 RCX: 00007f01ab38eec9 RDX: 0000000020000000 RSI: 00002000000035c0 RDI: 0000000000000005 RBP: 00007f01ab411f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f01ab5e6128 R14: 00007f01ab5e6090 R15: 00007fffff50cb68 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:hlist_add_before_rcu include/linux/rculist.h:705 [inline] RIP: 0010:__xfrm_state_insert+0x1710/0x2510 net/xfrm/xfrm_state.c:1743 Code: 00 fc ff df 4c 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 96 0d 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 7b 30 4c 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 6a 0d 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 RSP: 0018:ffffc9001be4f288 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff888057994880 RCX: 1ffff1100af32915 RDX: 0000000000000000 RSI: 1ffff1100af32916 RDI: 0000000000000001 RBP: ffff888077d6c880 R08: 0000000000000001 R09: 0000000000000008 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888057994440 R13: ffff8880579948a8 R14: ffff888057994470 R15: 0000000000000000 FS: 00007f01ac21a6c0(0000) GS:ffff8881247b2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000009b48 CR3: 000000007c37a000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: df 4c 89 fa fisttps -0x6(%rcx,%rcx,4) 4: 48 c1 ea 03 shr $0x3,%rdx 8: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) c: 0f 85 96 0d 00 00 jne 0xda8 12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 19: fc ff df 1c: 4c 8b 7b 30 mov 0x30(%rbx),%r15 20: 4c 89 fa mov %r15,%rdx 23: 48 c1 ea 03 shr $0x3,%rdx * 27: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2b: 0f 85 6a 0d 00 00 jne 0xd9b 31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 38: fc ff df 3b: 4c rex.WR 3c: 89 .byte 0x89