BUG: unable to handle page fault for address: fffff52000a8b000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 17ffed067 P4D 17ffed067 PUD 1c695067 PMD 265a0067 PTE 0
Oops: Oops: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 842 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events_power_efficient fb_flashcursor
RIP: 0010:fb_write_offset drivers/video/fbdev/core/sysmem.h:30 [inline]
RIP: 0010:fb_bitmap_2ppw drivers/video/fbdev/core/fb_imageblit.h:374 [inline]
RIP: 0010:fb_bitmap_imageblit drivers/video/fbdev/core/fb_imageblit.h:462 [inline]
RIP: 0010:fb_imageblit drivers/video/fbdev/core/fb_imageblit.h:492 [inline]
RIP: 0010:sys_imageblit+0x1985/0x1e60 drivers/video/fbdev/core/sysimgblt.c:24
Code: e8 06 83 e0 03 49 8d 7c c5 00 48 89 fa 48 c1 ea 03 80 3c 1a 00 0f 85 27 03 00 00 4c 89 f2 48 8b 84 c4 28 01 00 00 48 c1 ea 03 <80> 3c 1a 00 0f 85 aa 00 00 00 49 89 06 8b 3c 24 83 c5 01 41 c1 e4
RSP: 0018:ffffc90004ea7828 EFLAGS: 00010a06
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff84f28699
RDX: 1ffff92000a8b000 RSI: ffffffff84f28627 RDI: ffffc90004ea7950
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000000
R13: ffffc90004ea7950 R14: ffffc90005458000 R15: ffffc90005458000
FS:  0000000000000000(0000) GS:ffff8880d6b08000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff52000a8b000 CR3: 000000002e166000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 drm_fbdev_shmem_defio_imageblit+0x20/0x130 drivers/gpu/drm/drm_fbdev_shmem.c:38
 soft_cursor+0x524/0xa10 drivers/video/fbdev/core/softcursor.c:74
 bit_cursor+0xe8c/0x17e0 drivers/video/fbdev/core/bitblit.c:395
 fb_flashcursor drivers/video/fbdev/core/fbcon.c:401 [inline]
 fb_flashcursor+0x310/0x400 drivers/video/fbdev/core/fbcon.c:370
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263
 process_scheduled_works kernel/workqueue.c:3346 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
CR2: fffff52000a8b000
---[ end trace 0000000000000000 ]---
RIP: 0010:fb_write_offset drivers/video/fbdev/core/sysmem.h:30 [inline]
RIP: 0010:fb_bitmap_2ppw drivers/video/fbdev/core/fb_imageblit.h:374 [inline]
RIP: 0010:fb_bitmap_imageblit drivers/video/fbdev/core/fb_imageblit.h:462 [inline]
RIP: 0010:fb_imageblit drivers/video/fbdev/core/fb_imageblit.h:492 [inline]
RIP: 0010:sys_imageblit+0x1985/0x1e60 drivers/video/fbdev/core/sysimgblt.c:24
Code: e8 06 83 e0 03 49 8d 7c c5 00 48 89 fa 48 c1 ea 03 80 3c 1a 00 0f 85 27 03 00 00 4c 89 f2 48 8b 84 c4 28 01 00 00 48 c1 ea 03 <80> 3c 1a 00 0f 85 aa 00 00 00 49 89 06 8b 3c 24 83 c5 01 41 c1 e4
RSP: 0018:ffffc90004ea7828 EFLAGS: 00010a06
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff84f28699
RDX: 1ffff92000a8b000 RSI: ffffffff84f28627 RDI: ffffc90004ea7950
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000000
R13: ffffc90004ea7950 R14: ffffc90005458000 R15: ffffc90005458000
FS:  0000000000000000(0000) GS:ffff8880d6b08000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff52000a8b000 CR3: 000000002e166000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	e8 06 83 e0 03       	call   0x3e0830b
   5:	49 8d 7c c5 00       	lea    0x0(%r13,%rax,8),%rdi
   a:	48 89 fa             	mov    %rdi,%rdx
   d:	48 c1 ea 03          	shr    $0x3,%rdx
  11:	80 3c 1a 00          	cmpb   $0x0,(%rdx,%rbx,1)
  15:	0f 85 27 03 00 00    	jne    0x342
  1b:	4c 89 f2             	mov    %r14,%rdx
  1e:	48 8b 84 c4 28 01 00 	mov    0x128(%rsp,%rax,8),%rax
  25:	00
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 1a 00          	cmpb   $0x0,(%rdx,%rbx,1) <-- trapping instruction
  2e:	0f 85 aa 00 00 00    	jne    0xde
  34:	49 89 06             	mov    %rax,(%r14)
  37:	8b 3c 24             	mov    (%rsp),%edi
  3a:	83 c5 01             	add    $0x1,%ebp
  3d:	41                   	rex.B
  3e:	c1                   	.byte 0xc1
  3f:	e4                   	.byte 0xe4