BUG: unable to handle page fault for address: ffff8880ffffa100
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD d601067 P4D d601067 PUD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 10560 Comm: syz-executor.0 Not tainted 5.8.0-rc3-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:vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1168 [inline]
RIP: 0010:vga16fb_imageblit+0xa50/0x2210 drivers/video/fbdev/vga16fb.c:1260
Code: 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 09 84 d2 74 05 e8 49 e8 ec fd 41 8b 47 14 48 8b 4c 24 08 <88> 01 0f ae e8 8a 01 b8 05 00 00 00 ba ce 03 00 00 ee 48 c7 c2 38
RSP: 0018:ffffc90004067410 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000007 RCX: ffff8880ffffa100
RDX: 0000000000000000 RSI: ffffffff83c62162 RDI: ffffc900040675ac
RBP: ffffc9000406759c R08: 00000000fffffded R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff813293d0
R13: ffff8880a3ac9630 R14: ffffc900040675b8 R15: ffffc90004067598
FS:  00007f5511edc700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8880ffffa100 CR3: 000000009c541000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline]
 bit_putcs+0x6e1/0xd20 drivers/video/fbdev/core/bitblit.c:188
 fbcon_putcs+0x33c/0x3f0 drivers/video/fbdev/core/fbcon.c:1362
 fbcon_redraw_move.constprop.0+0x264/0x2b0 drivers/video/fbdev/core/fbcon.c:1742
 ypan_down_redraw drivers/video/fbdev/core/fbcon.c:1607 [inline]
 fbcon_scroll+0x2c9e/0x3600 drivers/video/fbdev/core/fbcon.c:2057
 con_scroll+0x5b9/0x6d0 drivers/tty/vt/vt.c:637
 csi_L drivers/tty/vt/vt.c:2002 [inline]
 do_con_trol drivers/tty/vt/vt.c:2401 [inline]
 do_con_write+0x7238/0x7400 drivers/tty/vt/vt.c:2823
 con_write+0x22/0xb0 drivers/tty/vt/vt.c:3159
 process_output_block drivers/tty/n_tty.c:595 [inline]
 n_tty_write+0x3ce/0xf80 drivers/tty/n_tty.c:2333
 do_tty_write drivers/tty/tty_io.c:962 [inline]
 tty_write+0x4d9/0x870 drivers/tty/tty_io.c:1046
 do_loop_readv_writev fs/read_write.c:718 [inline]
 do_loop_readv_writev fs/read_write.c:702 [inline]
 do_iter_write+0x48b/0x5f0 fs/read_write.c:1001
 vfs_writev+0x1aa/0x2e0 fs/read_write.c:1072
 do_writev+0x139/0x300 fs/read_write.c:1115
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007f5511edbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 000000000050eee0 RCX: 000000000045cb29
RDX: 0000000000000001 RSI: 00000000200005c0 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000d62 R14: 00000000004cb843 R15: 00007f5511edc6d4
Modules linked in:
CR2: ffff8880ffffa100
---[ end trace 6f43fc1fc9d3e916 ]---
RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1168 [inline]
RIP: 0010:vga16fb_imageblit+0xa50/0x2210 drivers/video/fbdev/vga16fb.c:1260
Code: 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 09 84 d2 74 05 e8 49 e8 ec fd 41 8b 47 14 48 8b 4c 24 08 <88> 01 0f ae e8 8a 01 b8 05 00 00 00 ba ce 03 00 00 ee 48 c7 c2 38
RSP: 0018:ffffc90004067410 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000007 RCX: ffff8880ffffa100
RDX: 0000000000000000 RSI: ffffffff83c62162 RDI: ffffc900040675ac
RBP: ffffc9000406759c R08: 00000000fffffded R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff813293d0
R13: ffff8880a3ac9630 R14: ffffc900040675b8 R15: ffffc90004067598
FS:  00007f5511edc700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8880ffffa100 CR3: 000000009c541000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400