kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] [ 877.702533] audit: type=1400 audit(1574552908.605:544): avc: denied { create } for pid=5880 comm="syz-executor.3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=0 Dead loop on virtual device ip6tnl0, fix it urgently! PREEMPT SMP KASAN Modules linked in: CPU: 1 PID: 5893 Comm: syz-executor.4 Not tainted 4.4.174+ #17 task: ffff8801d2572f80 task.stack: ffff8800742d0000 RIP: 0010:[] [] __xfrm_policy_check2 include/net/xfrm.h:1070 [inline] RIP: 0010:[] [] xfrm_policy_check include/net/xfrm.h:1076 [inline] RIP: 0010:[] [] xfrm6_policy_check include/net/xfrm.h:1086 [inline] RIP: 0010:[] [] udpv6_queue_rcv_skb+0x18d/0x14d0 net/ipv6/udp.c:634 RSP: 0018:ffff8800742d7738 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc90003d8b000 RDX: 000000000000000c RSI: ffffffff82615684 RDI: 0000000000000060 RBP: ffff8800742d7780 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800b284be80 R13: ffff8800b4055dc0 R14: 0000000000000000 R15: ffff8800b4055e18 FS: 0000000000000000(0000) GS:ffff8801db700000(0063) knlGS:00000000f55f3b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000200301ff CR3: 00000000b5b20000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801d2572f80 ffff880000000001 ffff8800b284bf08 ffff8800b284bf08 ffff8800b284be80 ffff8800b4055dc0 dffffc0000000000 ffff8800b284bf08 0000000000000000 ffff8800742d77f0 ffffffff821e5e40 ffff8800b284c2b0 Call Trace: [] sk_backlog_rcv include/net/sock.h:875 [inline] [] __release_sock net/core/sock.c:2024 [inline] [] release_sock+0x170/0x500 net/core/sock.c:2477 [] udp_sendmsg+0x1176/0x1c60 net/ipv4/udp.c:1107 [] udpv6_sendmsg+0x1e5d/0x24f0 net/ipv6/udp.c:1178 [] inet_sendmsg+0x202/0x4d0 net/ipv4/af_inet.c:755 [] sock_sendmsg_nosec net/socket.c:638 [inline] [] sock_sendmsg+0xbe/0x110 net/socket.c:648 [] SYSC_sendto net/socket.c:1678 [inline] [] SyS_sendto+0x201/0x340 net/socket.c:1646 [] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] [] do_fast_syscall_32+0x32d/0xa90 arch/x86/entry/common.c:397 [] sysenter_flags_fixed+0xd/0x1a Code: 8b 75 58 41 f6 c6 01 0f 85 d9 07 00 00 e8 6c 3f cf fe 49 83 e6 fe 48 b8 00 00 00 00 00 fc ff df 49 8d 7e 60 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 01 0f 8e 8b 0e 00 00 41 f6 46 60 04 RIP [] __xfrm_policy_check2 include/net/xfrm.h:1070 [inline] RIP [] xfrm_policy_check include/net/xfrm.h:1076 [inline] RIP [] xfrm6_policy_check include/net/xfrm.h:1086 [inline] RIP [] udpv6_queue_rcv_skb+0x18d/0x14d0 net/ipv6/udp.c:634 RSP ---[ end trace fd5191bbe1301c5e ]---