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 18107067 P4D 18107067 PUD 6fb29067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 11806 Comm: kworker/0:0 Not tainted 4.14.124 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt padata_serial_worker
task: ffff8880a63280c0 task.stack: ffff8880a8f18000
RIP: 0010:          (null)
RSP: 0018:ffff8880a8f1fc80 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88809b568b80 RCX: ffff8880a8f1fcf0
RDX: 1ffff110136ad172 RSI: 0000000000000000 RDI: ffff88809b568b80
RBP: ffff8880a8f1fc98 R08: ffff8880a63280c0 R09: 0000000000000002
R10: 0000000000000000 R11: ffff8880a63280c0 R12: ffff8880a8f1fd10
R13: ffff8880a69a4e5c R14: ffff88809b568bd8 R15: ffff88809b568bd0
FS:  0000000000000000(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000016bc0000 CR4: 00000000001426f0
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:307
 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: ffff8880a8f1fc80
CR2: 0000000000000000
---[ end trace 52942258ecd4371a ]---