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 92734067 P4D 92734067 PUD a06fc067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.14.183-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt padata_serial_worker
task: ffff8880a9d4e4c0 task.stack: ffff8880a9d60000
RIP: 0010:          (null)
RSP: 0018:ffff8880a9d67cc8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880a0fb55d0 RCX: 1ffff110153acfa1
RDX: 1ffff110141f6ab2 RSI: 0000000000000000 RDI: ffff8880a0fb5580
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000002
R10: 000000000011ce49 R11: ffff8880a9d4e4c0 R12: 0000000000000001
R13: ffff8880a9d67d08 R14: ffff8880a0fb55d8 R15: ffff8882191b8800
FS:  0000000000000000(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000a8ed2000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 padata_serial_worker+0x24e/0x3b0 kernel/padata.c:307
 process_one_work+0x7c0/0x14c0 kernel/workqueue.c:2116
 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code:  Bad RIP value.
RIP:           (null) RSP: ffff8880a9d67cc8
CR2: 0000000000000000
---[ end trace 4132155a23cd2ba5 ]---