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 87c26067 P4D 87c26067 PUD 87c27067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7387 Comm: kworker/1:4 Not tainted 4.14.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt padata_serial_worker
task: ffff888051218600 task.stack: ffff888051220000
RIP: 0010:          (null)
RSP: 0018:ffff888051227cc8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88803f288cd0 RCX: 1ffff1100a244fa1
RDX: 1ffff11007e51192 RSI: 0000000000000000 RDI: ffff88803f288c80
RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000002
R10: ffff888051218ed8 R11: ffff888051218600 R12: 0000000000000001
R13: ffff888051227d08 R14: ffff88803f288cd8 R15: ffff8882191d51c0
FS:  0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000087c25000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 padata_serial_worker+0x269/0x400 kernel/padata.c:317
 process_one_work+0x813/0x1540 kernel/workqueue.c:2116
 worker_thread+0x5d1/0x1070 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: ffff888051227cc8
CR2: 0000000000000000
---[ end trace 8e8d64d7f19dad87 ]---