TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 0 PID: 7762 Comm: kworker/u4:5 Not tainted 4.17.0+ #86
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
binder: 29049:29050 ERROR: BC_REGISTER_LOOPER called without request
Workqueue: writeback wb_workfn
RIP: 0010:dev_name include/linux/device.h:1015 [inline]
RIP: 0010:wb_workfn+0x195/0x1740 fs/fs-writeback.c:1937
Code: 48 c1 ea 03 80 3c 02 
binder: 29050 RLIMIT_NICE not set
00 0f 85 ee 13 00 00 48 8b 9b 08 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 3f 14 00 00 4c 8b 63 50 4d 85 e4 0f 84 a9 0e 00 
RSP: 0018:ffff88018030f270 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff814e1b3d
RDX: 000000000000000a RSI: ffffffff81cd546d RDI: 0000000000000050
RBP: ffff88018030f750 R08: ffff8801b3694380 R09: ffffed003b5c46d6
R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000001
R13: 1ffff10030061f37 R14: ffff88018030f728 R15: ffff8801c9b076d8
FS:  0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 0000000008c6a000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 process_one_work+0xc64/0x1b70 kernel/workqueue.c:2153
 process_scheduled_works kernel/workqueue.c:2212 [inline]
 worker_thread+0x9e5/0x13a0 kernel/workqueue.c:2301
 kthread+0x345/0x410 kernel/kthread.c:240
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 6165e38e64dc0911 ]---
RIP: 0010:dev_name include/linux/device.h:1015 [inline]
RIP: 0010:wb_workfn+0x195/0x1740 fs/fs-writeback.c:1937
Code: 48 c1 ea 03 80 3c 02 00 0f 85 ee 13 00 00 48 8b 9b 08 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 3f 14 00 00 4c 8b 63 50 4d 85 e4 0f 84 a9 0e 00 
RSP: 0018:ffff88018030f270 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff814e1b3d
RDX: 000000000000000a RSI: ffffffff81cd546d RDI: 0000000000000050
RBP: ffff88018030f750 R08: ffff8801b3694380 R09: ffffed003b5c46d6
R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000001
R13: 1ffff10030061f37 R14: ffff88018030f728 R15: ffff8801c9b076d8
FS:  0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000625208 CR3: 0000000008c6a000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400