BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD 97a8d067 P4D 97a8d067 PUD a2380067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 2678 Comm: kworker/1:2 Not tainted 4.14.217-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt padata_serial_worker
task: ffff8880af0be4c0 task.stack: ffff8880af0d0000
RIP: 0010:          (null)
RSP: 0018:ffff8880af0d7cd0 EFLAGS: 00010296
RAX: 0000000000000000 RBX: ffff8880b528f550 RCX: 1ffff11015e1afa2
RDX: 1ffff11016a51ea2 RSI: 0000000000000000 RDI: ffff8880b528f500
RBP: dffffc0000000000 R08: ffffe8ffffd24360 R09: 0000000000000002
R10: 0000000000000000 R11: ffff8880af0be4c0 R12: 0000000000000001
R13: ffff8880af0d7d10 R14: ffff8880b0f62200 R15: ffff8880b528f558
FS:  0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000aa9a8000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
audit: type=1800 audit(1611950348.494:67): pid=13586 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="sda1" ino=16219 res=0
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 padata_serial_worker+0x232/0x3e0 kernel/padata.c:307
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
 worker_thread+0x5cc/0xff0 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: ffff8880af0d7cd0
CR2: 0000000000000000
---[ end trace a734c1c12b36bed8 ]---