BUG: unable to handle kernel NULL pointer dereference at           (null)
IP: do_syscall_64+0x1e3/0x640 arch/x86/entry/common.c:292
PGD 214e90067 P4D 214e90067 PUD 214e91067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 28778 Comm: syz-executor.4 Not tainted 4.14.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88803c278140 task.stack: ffff8881eedd0000
RIP: 0010:do_syscall_64+0x1e3/0x640 arch/x86/entry/common.c:292
RSP: 0018:ffff8881eedd7f00 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffffff814e0870 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8881eedd7fa8
RBP: ffff8881eedd7f58 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff87d16698
R13: ffff8881eedd7fd0 R14: ffff88803c278140 R15: 0000000000000000
FS:  00000000010ff940(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001ee62d000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45af51
RSP: 002b:00007ffd895471d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 000000000018686a RCX: 000000000045af51
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffd895471e0
RBP: 0000000000000001 R08: 00000000aab9f6af R09: 00000000aab9f6b3
R10: 00007ffd895472e0 R11: 0000000000000293 R12: 000000000078bf00
R13: 000000000078c900 R14: ffffffffffffffff R15: 000000000078c0ec
Code: 00 00 fc ff df 49 89 fa 49 c1 ea 03 41 80 3c 02 00 0f 85 16 03 00 00 48 8b 7d 70 ff d3 48 8d 7d 50 48 ba 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 77 00 00 00 00 00 
RIP: do_syscall_64+0x1e3/0x640 arch/x86/entry/common.c:292 RSP: ffff8881eedd7f00
CR2: 0000000000000000
---[ end trace 7986804a778c6244 ]---
BUG: unable to handle kernel