Oops: general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7]
CPU: 0 UID: 0 PID: 11616 Comm: syz.4.1836 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_cursor+0x1eb/0x6f0
Code: e8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 c2 03 00 00 41 0f b7 7d 00 e8 23 8f 96 fc 4c 8d ad c4 01 00 00 4c 89 e9 48 c1 e9 03 <42> 0f b6 0c 39 84 c9 48 89 6c 24 08 0f 85 b5 03 00 00 41 89 45 00
RSP: 0018:ffffc9000685f558 EFLAGS: 00010203
RAX: 0000000000000014 RBX: ffff88810068a000 RCX: 0000000000000038
RDX: ffffc90005b54000 RSI: 0000000000000d72 RDI: 0000000000000d73
RBP: 0000000000000000 R08: ffffffff9011888f R09: 1ffffffff2023111
R10: dffffc0000000000 R11: fffffbfff2023112 R12: 1ffff1102124fc92
R13: 00000000000001c4 R14: ffff88810927e000 R15: dffffc0000000000
FS:  00007f11b6cb36c0(0000) GS:ffff88818de52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002984 CR3: 00000001a6340000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 hide_cursor+0xd3/0x490
 do_con_write+0x1cf/0x5110
 con_write+0x27/0x290
 n_tty_write+0xd80/0x12a0
 file_tty_write+0x51f/0x9c0
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x170/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f11b5d9e019
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:00007f11b6cb3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f11b6026180 RCX: 00007f11b5d9e019
RDX: 0000000000001006 RSI: 0000200000001980 RDI: 0000000000000008
RBP: 00007f11b5e3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f11b6026218 R14: 00007f11b6026180 R15: 00007ffd987d1168
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:fbcon_cursor+0x1eb/0x6f0
Code: e8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 c2 03 00 00 41 0f b7 7d 00 e8 23 8f 96 fc 4c 8d ad c4 01 00 00 4c 89 e9 48 c1 e9 03 <42> 0f b6 0c 39 84 c9 48 89 6c 24 08 0f 85 b5 03 00 00 41 89 45 00
RSP: 0018:ffffc9000685f558 EFLAGS: 00010203
RAX: 0000000000000014 RBX: ffff88810068a000 RCX: 0000000000000038
RDX: ffffc90005b54000 RSI: 0000000000000d72 RDI: 0000000000000d73
RBP: 0000000000000000 R08: ffffffff9011888f R09: 1ffffffff2023111
R10: dffffc0000000000 R11: fffffbfff2023112 R12: 1ffff1102124fc92
R13: 00000000000001c4 R14: ffff88810927e000 R15: dffffc0000000000
FS:  00007f11b6cb36c0(0000) GS:ffff88818de52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002984 CR3: 00000001a6340000 CR4: 00000000000006f0
