BUG: unable to handle page fault for address: ffff888001000180
#PF: supervisor write access in kernel mode
#PF: error_code(0x0003) - permissions violation
PGD 10c01067 P4D 10c01067 PUD 10c02067 PMD 80000000010001e1 
Oops: 0003 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 30328 Comm: syz-executor.0 Not tainted 5.14.0-rc1-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+0xfe0/0x1430 drivers/video/fbdev/vga16fb.c:923
Code: ff 48 8b 6c 24 08 89 ee e8 ad a0 32 fd 4c 63 f3 48 89 eb 44 8b 7c 24 04 8d 45 ff 89 44 24 18 41 ff cf 85 db 74 2a 8b 6c 24 18 <45> 88 2c 24 85 ed 74 0c 49 ff c4 e8 70 9c 32 fd ff cd eb ec e8 67
RSP: 0018:ffffc900094bf808 EFLAGS: 00010206
RAX: ffffffff844d85cc RBX: 0000000000000050 RCX: 0000000000040000
RDX: ffffc90010263000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 000000000000004f R08: ffffffff844d8573 R09: ffffffff844d7cc7
R10: 0000000000000002 R11: ffff88802c6bb880 R12: ffff888001000180
R13: 0000000000000000 R14: 0000000000000190 R15: 00000000afff7ccb
FS:  00007fdcdd8a2700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff888001000180 CR3: 00000000143ec000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bit_clear_margins+0x3e1/0x700 drivers/video/fbdev/core/bitblit.c:232
 fbcon_clear_margins drivers/video/fbdev/core/fbcon.c:1315 [inline]
 fbcon_switch+0x1652/0x22e0 drivers/video/fbdev/core/fbcon.c:2146
 redraw_screen+0x53d/0x1270 drivers/tty/vt/vt.c:1021
 do_fb_ioctl+0x6d4/0x7e0 drivers/video/fbdev/core/fbmem.c:1108
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdcdd8a2188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007fff96fa607f R14: 00007fdcdd8a2300 R15: 0000000000022000
Modules linked in:
CR2: ffff888001000180
BUG: unable to handle page fault for address: ffff888001000180
#PF: supervisor write access in kernel mode
#PF: error_code(0x0003) - permissions violation
PGD 10c01067 P4D 10c01067 PUD 10c02067 PMD 80000000010001e1 
Oops: 0003 [#2] PREEMPT SMP KASAN
CPU: 0 PID: 30328 Comm: syz-executor.0 Not tainted 5.14.0-rc1-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+0xfe0/0x1430 drivers/video/fbdev/vga16fb.c:923
Code: ff 48 8b 6c 24 08 89 ee e8 ad a0 32 fd 4c 63 f3 48 89 eb 44 8b 7c 24 04 8d 45 ff 89 44 24 18 41 ff cf 85 db 74 2a 8b 6c 24 18 <45> 88 2c 24 85 ed 74 0c 49 ff c4 e8 70 9c 32 fd ff cd eb ec e8 67
RSP: 0018:ffffc900094bee08 EFLAGS: 00010006
RAX: ffffffff844d85cc RBX: 0000000000000050 RCX: 0000000000040000
RDX: ffffc90010263000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 000000000000004f R08: ffffffff844d8573 R09: ffffffff844d7cc7
R10: 0000000000000002 R11: ffff88802c6bb880 R12: ffff888001000180
R13: 0000000000000000 R14: 0000000000000190 R15: 00000000afff7ccb
FS:  00007fdcdd8a2700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff888001000180 CR3: 00000000143ec000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bit_clear_margins+0x3e1/0x700 drivers/video/fbdev/core/bitblit.c:232
 fbcon_clear_margins drivers/video/fbdev/core/fbcon.c:1315 [inline]
 fbcon_switch+0x1652/0x22e0 drivers/video/fbdev/core/fbcon.c:2146
 redraw_screen+0x53d/0x1270 drivers/tty/vt/vt.c:1021
 fbcon_blank+0x556/0xa50 drivers/video/fbdev/core/fbcon.c:2207
 do_unblank_screen+0x27e/0xb20 drivers/tty/vt/vt.c:4398
 bust_spinlocks+0x43/0xd0 lib/bust_spinlocks.c:26
 oops_end+0x45/0x140 arch/x86/kernel/dumpstack.c:361
 page_fault_oops+0x7ef/0xa20 arch/x86/mm/fault.c:708
 __bad_area_nosemaphore+0x121/0x570 arch/x86/mm/fault.c:801
 do_kern_addr_fault arch/x86/mm/fault.c:1200 [inline]
 handle_page_fault arch/x86/mm/fault.c:1473 [inline]
 exc_page_fault+0x153/0x1e0 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:vga16fb_fillrect+0xfe0/0x1430 drivers/video/fbdev/vga16fb.c:923
Code: ff 48 8b 6c 24 08 89 ee e8 ad a0 32 fd 4c 63 f3 48 89 eb 44 8b 7c 24 04 8d 45 ff 89 44 24 18 41 ff cf 85 db 74 2a 8b 6c 24 18 <45> 88 2c 24 85 ed 74 0c 49 ff c4 e8 70 9c 32 fd ff cd eb ec e8 67
RSP: 0018:ffffc900094bf808 EFLAGS: 00010206
RAX: ffffffff844d85cc RBX: 0000000000000050 RCX: 0000000000040000
RDX: ffffc90010263000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 000000000000004f R08: ffffffff844d8573 R09: ffffffff844d7cc7
R10: 0000000000000002 R11: ffff88802c6bb880 R12: ffff888001000180
R13: 0000000000000000 R14: 0000000000000190 R15: 00000000afff7ccb
 bit_clear_margins+0x3e1/0x700 drivers/video/fbdev/core/bitblit.c:232
 fbcon_clear_margins drivers/video/fbdev/core/fbcon.c:1315 [inline]
 fbcon_switch+0x1652/0x22e0 drivers/video/fbdev/core/fbcon.c:2146
 redraw_screen+0x53d/0x1270 drivers/tty/vt/vt.c:1021
 do_fb_ioctl+0x6d4/0x7e0 drivers/video/fbdev/core/fbmem.c:1108
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdcdd8a2188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007fff96fa607f R14: 00007fdcdd8a2300 R15: 0000000000022000
Modules linked in:
CR2: ffff888001000180
---[ end trace ecca768c8e242090 ]---
RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline]
RIP: 0010:vga16fb_fillrect+0xfe0/0x1430 drivers/video/fbdev/vga16fb.c:923
Code: ff 48 8b 6c 24 08 89 ee e8 ad a0 32 fd 4c 63 f3 48 89 eb 44 8b 7c 24 04 8d 45 ff 89 44 24 18 41 ff cf 85 db 74 2a 8b 6c 24 18 <45> 88 2c 24 85 ed 74 0c 49 ff c4 e8 70 9c 32 fd ff cd eb ec e8 67
RSP: 0018:ffffc900094bf808 EFLAGS: 00010206
RAX: ffffffff844d85cc RBX: 0000000000000050 RCX: 0000000000040000
RDX: ffffc90010263000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 000000000000004f R08: ffffffff844d8573 R09: ffffffff844d7cc7
R10: 0000000000000002 R11: ffff88802c6bb880 R12: ffff888001000180
R13: 0000000000000000 R14: 0000000000000190 R15: 00000000afff7ccb
FS:  00007fdcdd8a2700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff888001000180 CR3: 00000000143ec000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400