BUG: unable to handle page fault for address: ffffc90007196000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 1bc00067 P4D 1bc00067 PUD 1d293067 PMD 22034067 PTE 0
Oops: Oops: 0002 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 6226 Comm: syz.2.83 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:rep_movs arch/x86/lib/iomem.c:13 [inline]
RIP: 0010:string_memcpy_toio arch/x86/lib/iomem.c:64 [inline]
RIP: 0010:memcpy_toio+0x87/0xe0 arch/x86/lib/iomem.c:110
Code: b8 fc 49 89 dd 31 ff 41 83 e5 02 4c 89 ee e8 f0 28 b8 fc 4d 85 ed 75 33 e8 46 2e b8 fc 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 e8 23 2e b8 fc
RSP: 0018:ffffc9000782f5c0 EFLAGS: 00010206
RAX: 0000000000000000 RBX: ffffc90007195d20 RCX: 00000000000000d8
RDX: ffff88802232ca80 RSI: ffffc90004051f60 RDI: ffffc90007196000
RBP: 0000000000000640 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 000000000000001e R12: ffffc90004051c80
R13: 0000000000000000 R14: ffffc90007195d20 R15: 0000000000000640
FS:  0000000000000000(0000) GS:ffff888096bdf000(0063) knlGS:0000000056b41480
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffc90007196000 CR3: 0000000070295000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 iosys_map_memcpy_to include/linux/iosys-map.h:285 [inline]
 drm_fb_memcpy+0x459/0x620 drivers/gpu/drm/drm_format_helper.c:442
 cirrus_primary_plane_helper_atomic_update+0xb1d/0xfe0 drivers/gpu/drm/tiny/cirrus-qemu.c:358
 drm_atomic_helper_commit_planes+0x497/0xf10 drivers/gpu/drm/drm_atomic_helper.c:3038
 drm_atomic_helper_commit_tail+0x7f/0x130 drivers/gpu/drm/drm_atomic_helper.c:1989
 commit_tail+0x338/0x430 drivers/gpu/drm/drm_atomic_helper.c:2074
 drm_atomic_helper_commit+0x303/0x380 drivers/gpu/drm/drm_atomic_helper.c:2312
 drm_atomic_commit+0x230/0x300 drivers/gpu/drm/drm_atomic.c:1789
 drm_client_modeset_commit_atomic+0x6a6/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1104
 drm_client_modeset_commit_locked+0x14d/0x580 drivers/gpu/drm/drm_client_modeset.c:1207
 drm_client_modeset_commit+0x4f/0x80 drivers/gpu/drm/drm_client_modeset.c:1233
 __drm_fb_helper_restore_fbdev_mode_unlocked.part.0+0x137/0x160 drivers/gpu/drm/drm_fb_helper.c:138
 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:126 [inline]
 drm_fb_helper_restore_fbdev_mode_unlocked+0x93/0xc0 drivers/gpu/drm/drm_fb_helper.c:169
 drm_fbdev_client_restore+0x1b/0x30 drivers/gpu/drm/clients/drm_fbdev_client.c:45
 drm_client_dev_restore+0x205/0x2a0 drivers/gpu/drm/drm_client_event.c:118
 drm_lastclose drivers/gpu/drm/drm_file.c:408 [inline]
 drm_release+0x2c6/0x360 drivers/gpu/drm/drm_file.c:441
 __fput+0x3ff/0xb50 fs/file_table.c:512
 task_work_run+0x150/0x240 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 __do_fast_syscall_32+0x701/0x970 arch/x86/entry/syscall_32.c:310
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f15fec
Code: Unable to access opcode bytes at 0xf7f15fc2.
RSP: 002b:00000000ffd3840c EFLAGS: 00000202
 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 000000000000001e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
CR2: ffffc90007196000
---[ end trace 0000000000000000 ]---
RIP: 0010:rep_movs arch/x86/lib/iomem.c:13 [inline]
RIP: 0010:string_memcpy_toio arch/x86/lib/iomem.c:64 [inline]
RIP: 0010:memcpy_toio+0x87/0xe0 arch/x86/lib/iomem.c:110
Code: b8 fc 49 89 dd 31 ff 41 83 e5 02 4c 89 ee e8 f0 28 b8 fc 4d 85 ed 75 33 e8 46 2e b8 fc 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 e8 23 2e b8 fc
RSP: 0018:ffffc9000782f5c0 EFLAGS: 00010206
RAX: 0000000000000000 RBX: ffffc90007195d20 RCX: 00000000000000d8
RDX: ffff88802232ca80 RSI: ffffc90004051f60 RDI: ffffc90007196000
RBP: 0000000000000640 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 000000000000001e R12: ffffc90004051c80
R13: 0000000000000000 R14: ffffc90007195d20 R15: 0000000000000640
FS:  0000000000000000(0000) GS:ffff888096bdf000(0063) knlGS:0000000056b41480
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7f16000 CR3: 0000000070295000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	b8 fc 49 89 dd       	mov    $0xdd8949fc,%eax
   5:	31 ff                	xor    %edi,%edi
   7:	41 83 e5 02          	and    $0x2,%r13d
   b:	4c 89 ee             	mov    %r13,%rsi
   e:	e8 f0 28 b8 fc       	call   0xfcb82903
  13:	4d 85 ed             	test   %r13,%r13
  16:	75 33                	jne    0x4b
  18:	e8 46 2e b8 fc       	call   0xfcb82e63
  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:	e8 23 2e b8 fc       	call   0xfcb82e63