kasan: GPF could be caused by NULL-ptr deref or user memory access
audit: type=1400 audit(1564444481.393:44): avc:  denied  { create } for  pid=8603 comm="syz-executor.2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 8630 Comm: syz-executor.3 Not tainted 4.14.134 #30
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888097312640 task.stack: ffff888057938000
RIP: 0010:rxrpc_connect_call+0xc9/0x41a0 net/rxrpc/conn_client.c:684
RSP: 0018:ffff88805793f738 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900140ed000
RDX: 0000000000000003 RSI: ffffffff8593c089 RDI: 0000000000000018
audit: type=1400 audit(1564444481.443:45): avc:  denied  { write } for  pid=8603 comm="syz-executor.2" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1
RBP: ffff88805793f880 R08: 0000000000000001 R09: ffff888097312ee0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807aecac00
R13: ffff8880a8b08c20 R14: ffff8880a8b08c10 R15: ffff88805793f998
FS:  00007f08a5a8f700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcddc05998 CR3: 00000000a8ae7000 CR4: 00000000001406e0
Call Trace:
kobject: 'loop0' (ffff8880a4914f20): kobject_uevent_env
kobject: 'loop0' (ffff8880a4914f20): fill_kobj_path: path = '/devices/virtual/block/loop0'
kobject: 'loop4' (ffff8880a4a56a60): kobject_uevent_env
 rxrpc_new_client_call+0x8f7/0x1420 net/rxrpc/call_object.c:276
 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:525 [inline]
 rxrpc_do_sendmsg+0x91a/0x1103 net/rxrpc/sendmsg.c:577
 rxrpc_sendmsg+0x48a/0x650 net/rxrpc/af_rxrpc.c:543
kobject: 'loop4' (ffff8880a4a56a60): fill_kobj_path: path = '/devices/virtual/block/loop4'
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xce/0x110 net/socket.c:656
 ___sys_sendmsg+0x349/0x840 net/socket.c:2062
 __sys_sendmmsg+0x152/0x3a0 net/socket.c:2152
 SYSC_sendmmsg net/socket.c:2183 [inline]
 SyS_sendmmsg+0x35/0x60 net/socket.c:2178
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459829
RSP: 002b:00007f08a5a8ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
kobject: 'loop1' (ffff8880a494b1a0): kobject_uevent_env
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459829
RDX: 0000000000000001 RSI: 0000000020005c00 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f08a5a8f6d4
R13: 00000000004c6fe8 R14: 00000000004dc518 R15: 00000000ffffffff
Code: e8 
kobject: 'loop1' (ffff8880a494b1a0): fill_kobj_path: path = '/devices/virtual/block/loop1'
03 80 3c 18 00 0f 85 6f 39 00 00 48 8b 85 28 ff ff ff 48 8b 18 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 18 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 8a 39 00 00 48 8b 5b 18 48 8d bb 00 02 00 00 
RIP: rxrpc_connect_call+0xc9/0x41a0 net/rxrpc/conn_client.c:684 RSP: ffff88805793f738
---[ end trace e57c90fb6ad0c914 ]---