BUG: unable to handle page fault for address: fffff5200477f20c
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23fff5067 P4D 23fff5067 PUD 1c6b6067 PMD 2ab30067 PTE 0
Oops: Oops: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 16131 Comm: kworker/1:0 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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:364 [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+0x16c1/0x1d60 drivers/video/fbdev/core/sysimgblt.c:24
Code: 7c cd 00 48 89 fe 48 c1 ee 03 80 3c 1e 00 0f 85 aa 05 00 00 4d 63 f6 48 8b 8c cc 88 00 00 00 4f 8d 34 f7 4c 89 f6 48 c1 ee 03 <80> 3c 1e 00 0f 85 1b 03 00 00 49 89 0e 41 89 c6 8d 4d fd 41 c1 ee
RSP: 0018:ffffc900035cf8b0 EFLAGS: 00010a06
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 1ffff9200477f20c RDI: ffffc900035cf938
RBP: 0000000000000004 R08: 0000000000000005 R09: 0000000000000003
R10: 0000000000000004 R11: 000000000000007f R12: ffff8880270b57f1
R13: ffffc900035cf938 R14: ffffc90023bf9060 R15: ffffc90023bf9060
FS:  0000000000000000(0000) GS:ffff88812445a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff5200477f20c CR3: 0000000040b0a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 drm_fbdev_shmem_defio_imageblit+0x20/0x130 drivers/gpu/drm/drm_fbdev_shmem.c:39
 soft_cursor+0x524/0xa10 drivers/video/fbdev/core/softcursor.c:74
 ud_cursor+0xeb6/0x16e0 drivers/video/fbdev/core/fbcon_ud.c:394
 fb_flashcursor drivers/video/fbdev/core/fbcon.c:424 [inline]
 fb_flashcursor+0x338/0x430 drivers/video/fbdev/core/fbcon.c:393
 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
 process_scheduled_works kernel/workqueue.c:3358 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
CR2: fffff5200477f20c
---[ 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:364 [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+0x16c1/0x1d60 drivers/video/fbdev/core/sysimgblt.c:24
Code: 7c cd 00 48 89 fe 48 c1 ee 03 80 3c 1e 00 0f 85 aa 05 00 00 4d 63 f6 48 8b 8c cc 88 00 00 00 4f 8d 34 f7 4c 89 f6 48 c1 ee 03 <80> 3c 1e 00 0f 85 1b 03 00 00 49 89 0e 41 89 c6 8d 4d fd 41 c1 ee
RSP: 0018:ffffc900035cf8b0 EFLAGS: 00010a06
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 1ffff9200477f20c RDI: ffffc900035cf938
RBP: 0000000000000004 R08: 0000000000000005 R09: 0000000000000003
R10: 0000000000000004 R11: 000000000000007f R12: ffff8880270b57f1
R13: ffffc900035cf938 R14: ffffc90023bf9060 R15: ffffc90023bf9060
FS:  0000000000000000(0000) GS:ffff88812445a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff5200477f20c CR3: 0000000040b0a000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	7c cd                	jl     0xffffffcf
   2:	00 48 89             	add    %cl,-0x77(%rax)
   5:	fe 48 c1             	decb   -0x3f(%rax)
   8:	ee                   	out    %al,(%dx)
   9:	03 80 3c 1e 00 0f    	add    0xf001e3c(%rax),%eax
   f:	85 aa 05 00 00 4d    	test   %ebp,0x4d000005(%rdx)
  15:	63 f6                	movsxd %esi,%esi
  17:	48 8b 8c cc 88 00 00 	mov    0x88(%rsp,%rcx,8),%rcx
  1e:	00
  1f:	4f 8d 34 f7          	lea    (%r15,%r14,8),%r14
  23:	4c 89 f6             	mov    %r14,%rsi
  26:	48 c1 ee 03          	shr    $0x3,%rsi
* 2a:	80 3c 1e 00          	cmpb   $0x0,(%rsi,%rbx,1) <-- trapping instruction
  2e:	0f 85 1b 03 00 00    	jne    0x34f
  34:	49 89 0e             	mov    %rcx,(%r14)
  37:	41 89 c6             	mov    %eax,%r14d
  3a:	8d 4d fd             	lea    -0x3(%rbp),%ecx
  3d:	41                   	rex.B
  3e:	c1                   	.byte 0xc1
  3f:	ee                   	out    %al,(%dx)