BUG: unable to handle page fault for address: ffff888001000050
#PF: supervisor write access in kernel mode
#PF: error_code(0x0003) - permissions violation
PGD 10601067 P4D 10601067 PUD 10602067 PMD 80000000010001e1 
Oops: 0003 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8439 Comm: syz-executor902 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:vga16fb_fillrect+0x993/0x18d0 drivers/video/fbdev/vga16fb.c:923
Code: 68 fd 48 63 44 24 10 45 31 f6 48 89 04 24 e8 44 73 68 fd 31 ff 89 de 31 ed e8 79 7a 68 fd 85 db 4d 89 ec 74 22 e8 2d 73 68 fd <45> 88 34 24 83 c5 01 89 df 49 83 c4 01 89 ee e8 49 7b 68 fd 39 eb
RSP: 0018:ffffc90009abf758 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 000000000000001b RCX: 0000000000000000
RDX: ffff888016263880 RSI: ffffffff840d3633 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff840d2fbd
R10: ffffffff840d3627 R11: 0000000000000000 R12: ffff888001000050
R13: ffff888001000050 R14: 0000000000000000 R15: 000000000ffeb7ff
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0063) knlGS:0000000008e962c0
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffff888001000050 CR3: 0000000033881000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bit_clear_margins+0x3f6/0x4b0 drivers/video/fbdev/core/bitblit.c:224
 fbcon_clear_margins+0x1f1/0x280 drivers/video/fbdev/core/fbcon.c:1315
 fbcon_switch+0xa8c/0x1620 drivers/video/fbdev/core/fbcon.c:2146
 redraw_screen+0x2b9/0x740 drivers/tty/vt/vt.c:1021
 fbcon_modechanged+0x593/0x6d0 drivers/video/fbdev/core/fbcon.c:2651
 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:2696
 do_fb_ioctl+0x62e/0x690 drivers/video/fbdev/core/fbmem.c:1108
 fb_compat_ioctl+0x17e/0x610 drivers/video/fbdev/core/fbmem.c:1307
 __do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:1167
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f04549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000ff83f28c EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004601
RDX: 0000000020000200 RSI: 00000000ff83f2e0 RDI: 00000000080e3000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
CR2: ffff888001000050
---[ end trace a7f60c001ee84f81 ]---
RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:vga16fb_fillrect+0x993/0x18d0 drivers/video/fbdev/vga16fb.c:923
Code: 68 fd 48 63 44 24 10 45 31 f6 48 89 04 24 e8 44 73 68 fd 31 ff 89 de 31 ed e8 79 7a 68 fd 85 db 4d 89 ec 74 22 e8 2d 73 68 fd <45> 88 34 24 83 c5 01 89 df 49 83 c4 01 89 ee e8 49 7b 68 fd 39 eb
RSP: 0018:ffffc90009abf758 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 000000000000001b RCX: 0000000000000000
RDX: ffff888016263880 RSI: ffffffff840d3633 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff840d2fbd
R10: ffffffff840d3627 R11: 0000000000000000 R12: ffff888001000050
R13: ffff888001000050 R14: 0000000000000000 R15: 000000000ffeb7ff
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0063) knlGS:0000000008e962c0
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffff888001000050 CR3: 0000000033881000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	68 fd 48 63 44       	pushq  $0x446348fd
   5:	24 10                	and    $0x10,%al
   7:	45 31 f6             	xor    %r14d,%r14d
   a:	48 89 04 24          	mov    %rax,(%rsp)
   e:	e8 44 73 68 fd       	callq  0xfd687357
  13:	31 ff                	xor    %edi,%edi
  15:	89 de                	mov    %ebx,%esi
  17:	31 ed                	xor    %ebp,%ebp
  19:	e8 79 7a 68 fd       	callq  0xfd687a97
  1e:	85 db                	test   %ebx,%ebx
  20:	4d 89 ec             	mov    %r13,%r12
  23:	74 22                	je     0x47
  25:	e8 2d 73 68 fd       	callq  0xfd687357
* 2a:	45 88 34 24          	mov    %r14b,(%r12) <-- trapping instruction
  2e:	83 c5 01             	add    $0x1,%ebp
  31:	89 df                	mov    %ebx,%edi
  33:	49 83 c4 01          	add    $0x1,%r12
  37:	89 ee                	mov    %ebp,%esi
  39:	e8 49 7b 68 fd       	callq  0xfd687b87
  3e:	39 eb                	cmp    %ebp,%ebx