BUG: unable to handle page fault for address: ffffc9000683904c
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 10c00067 P4D 10c00067 PUD 10dbe067 PMD 1a6d7067 PTE 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4470 Comm: kworker/0:15 Not tainted 5.16.0-rc4-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: events drm_fb_helper_damage_work
RIP: 0010:rep_movs arch/x86/lib/iomem.c:12 [inline]
RIP: 0010:memcpy_toio+0x83/0xe0 arch/x86/lib/iomem.c:57
Code: 79 fd 49 89 dd 31 ff 41 83 e5 02 4c 89 ee e8 f4 f5 79 fd 4d 85 ed 75 2e e8 5a f3 79 fd 48 89 e9 48 89 df 4c 89 e6 48 c1 e9 02 <f3> a5 40 f6 c5 02 74 02 66 a5 40 f6 c5 01 74 01 a4 5b 5d 41 5c 41
RSP: 0018:ffffc90004547bc8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffffc9000683904c RCX: 00000000000008c2
RDX: ffff888019ae0000 RSI: ffffc900049ea04c RDI: ffffc9000683904c
RBP: 0000000000002308 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff83fdb78c R11: 0000000000000000 R12: ffffc900049ea04c
R13: 0000000000000000 R14: ffffc900049ea04c R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9000683904c CR3: 000000005b413000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dma_buf_map_memcpy_to include/linux/dma-buf-map.h:245 [inline]
 drm_fb_helper_damage_blit_real drivers/gpu/drm/drm_fb_helper.c:388 [inline]
 drm_fb_helper_damage_blit drivers/gpu/drm/drm_fb_helper.c:419 [inline]
 drm_fb_helper_damage_work+0x733/0xac0 drivers/gpu/drm/drm_fb_helper.c:450
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
CR2: ffffc9000683904c
---[ end trace caa0780c9ce7b167 ]---
RIP: 0010:rep_movs arch/x86/lib/iomem.c:12 [inline]
RIP: 0010:memcpy_toio+0x83/0xe0 arch/x86/lib/iomem.c:57
Code: 79 fd 49 89 dd 31 ff 41 83 e5 02 4c 89 ee e8 f4 f5 79 fd 4d 85 ed 75 2e e8 5a f3 79 fd 48 89 e9 48 89 df 4c 89 e6 48 c1 e9 02 <f3> a5 40 f6 c5 02 74 02 66 a5 40 f6 c5 01 74 01 a4 5b 5d 41 5c 41
RSP: 0018:ffffc90004547bc8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffffc9000683904c RCX: 00000000000008c2
RDX: ffff888019ae0000 RSI: ffffc900049ea04c RDI: ffffc9000683904c
RBP: 0000000000002308 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff83fdb78c R11: 0000000000000000 R12: ffffc900049ea04c
R13: 0000000000000000 R14: ffffc900049ea04c R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9000683904c CR3: 000000005b413000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	79 fd                	jns    0xffffffff
   2:	49 89 dd             	mov    %rbx,%r13
   5:	31 ff                	xor    %edi,%edi
   7:	41 83 e5 02          	and    $0x2,%r13d
   b:	4c 89 ee             	mov    %r13,%rsi
   e:	e8 f4 f5 79 fd       	callq  0xfd79f607
  13:	4d 85 ed             	test   %r13,%r13
  16:	75 2e                	jne    0x46
  18:	e8 5a f3 79 fd       	callq  0xfd79f377
  1d:	48 89 e9             	mov    %rbp,%rcx
  20:	48 89 df             	mov    %rbx,%rdi
  23:	4c 89 e6             	mov    %r12,%rsi
  26:	48 c1 e9 02          	shr    $0x2,%rcx
* 2a:	f3 a5                	rep movsl %ds:(%rsi),%es:(%rdi) <-- trapping instruction
  2c:	40 f6 c5 02          	test   $0x2,%bpl
  30:	74 02                	je     0x34
  32:	66 a5                	movsw  %ds:(%rsi),%es:(%rdi)
  34:	40 f6 c5 01          	test   $0x1,%bpl
  38:	74 01                	je     0x3b
  3a:	a4                   	movsb  %ds:(%rsi),%es:(%rdi)
  3b:	5b                   	pop    %rbx
  3c:	5d                   	pop    %rbp
  3d:	41 5c                	pop    %r12
  3f:	41                   	rex.B