TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD a08e4067 P4D a08e4067 PUD 8ae45067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7033 Comm: kworker/0:2 Not tainted 4.14.136 #32
kobject: 'loop0' (ffff888057e3b560): kobject_uevent_env
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt padata_serial_worker
task: ffff88805e3a8440 task.stack: ffff88805e3c0000
RIP: 0010:          (null)
RSP: 0018:ffff88805e3c7c80 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8880a7029800 RCX: ffff88805e3c7cf0
RDX: 1ffff11014e05302 RSI: 0000000000000000 RDI: ffff8880a7029800
RBP: ffff88805e3c7c98 R08: ffff88805e3a8440 R09: 0000000000000002
R10: 0000000000000000 R11: ffff88805e3a8440 R12: ffff88805e3c7d10
R13: ffff8880a69f5a1c R14: ffff8880a7029858 R15: ffff8880a7029850
FS:  0000000000000000(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000a807e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 aead_request_complete include/crypto/internal/aead.h:75 [inline]
 pcrypt_aead_serial+0x7e/0xb0 crypto/pcrypt.c:123
 padata_serial_worker+0x261/0x400 kernel/padata.c:312
 process_one_work+0x863/0x1600 kernel/workqueue.c:2114
 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248
 kthread+0x319/0x430 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code:  Bad RIP value.
RIP:           (null) RSP: ffff88805e3c7c80
CR2: 0000000000000000
---[ end trace bd0c194cf973b46b ]---