Oops: general protection fault, probably for non-canonical address 0xdffffc000000003a: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000001d0-0x00000000000001d7]
CPU: 0 UID: 0 PID: 7436 Comm: syz.7.277 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:fbcon_putcs+0x234/0x5a0
Code: 00 00 45 0f b6 3f 31 ff 44 89 fe e8 46 53 aa fc 45 85 ff 74 07 e8 3c 50 aa fc eb 31 4d 8d be d4 01 00 00 4c 89 f8 48 c1 e8 03 <0f> b6 04 28 84 c0 0f 85 a8 02 00 00 45 8b 3f 31 ff 44 89 fe e8 53
RSP: 0018:ffffc90005cef948 EFLAGS: 00010207
RAX: 000000000000003a RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff888109e49d80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff9011888f R09: 1ffffffff2023111
R10: dffffc0000000000 R11: fffffbfff2023112 R12: ffff88810068a3c0
R13: ffff888109e40000 R14: 0000000000000000 R15: 00000000000001d4
FS:  00007f0a5f70e6c0(0000) GS:ffff88818de52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000004000 CR3: 000000011e2cc000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 do_update_region+0x389/0x440
 invert_screen+0x860/0xa00
 clear_selection+0x59/0x80
 con_font_op+0xbab/0xfe0
 vt_ioctl+0x1b93/0x20d0
 tty_ioctl+0x920/0xdd0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x170/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0a5e79e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0a5f70e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0a5ea25fa0 RCX: 00007f0a5e79e019
RDX: 0000200000000340 RSI: 0000000000004b72 RDI: 0000000000000003
RBP: 00007f0a5e83500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0a5ea26038 R14: 00007f0a5ea25fa0 R15: 00007ffd595c4728
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:fbcon_putcs+0x234/0x5a0
Code: 00 00 45 0f b6 3f 31 ff 44 89 fe e8 46 53 aa fc 45 85 ff 74 07 e8 3c 50 aa fc eb 31 4d 8d be d4 01 00 00 4c 89 f8 48 c1 e8 03 <0f> b6 04 28 84 c0 0f 85 a8 02 00 00 45 8b 3f 31 ff 44 89 fe e8 53
RSP: 0018:ffffc90005cef948 EFLAGS: 00010207
RAX: 000000000000003a RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff888109e49d80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff9011888f R09: 1ffffffff2023111
R10: dffffc0000000000 R11: fffffbfff2023112 R12: ffff88810068a3c0
R13: ffff888109e40000 R14: 0000000000000000 R15: 00000000000001d4
FS:  00007f0a5f70e6c0(0000) GS:ffff88818de52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000004000 CR3: 000000011e2cc000 CR4: 00000000000006f0
