general protection fault, probably for non-canonical address 0xdffffc0020000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: probably user-memory-access in range [0x0000000100000000-0x0000000100000007]
CPU: 0 PID: 2715 Comm: kworker/0:8 Not tainted 5.6.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events console_callback
RIP: 0010:fbcon_cursor+0x10e/0x650 drivers/video/fbdev/core/fbcon.c:1387
Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e2 04 00 00 4c 8b bd a0 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 <0f> b6 14 02 4c 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 b1
RSP: 0018:ffffc90008157b38 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888218cd5000 RCX: ffffffff83dc7c80
RDX: 0000000020000000 RSI: ffffffff83b0cb09 RDI: ffff8880971453a0
RBP: ffff888097145000 R08: ffff8880a02d2300 R09: ffffed1014741664
R10: ffffed1014741663 R11: ffff8880a3a0b31f R12: ffff8880a39b4000
R13: 0000000000000001 R14: ffff8880a39b4468 R15: 0000000100000004
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fba234d8000 CR3: 0000000097c0b000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 set_cursor drivers/tty/vt/vt.c:908 [inline]
 set_cursor+0x1e9/0x270 drivers/tty/vt/vt.c:899
 redraw_screen+0x4b1/0x770 drivers/tty/vt/vt.c:1024
 complete_change_console+0x100/0x390 drivers/tty/vt/vt_ioctl.c:1269
 change_console+0x191/0x2b0 drivers/tty/vt/vt_ioctl.c:1394
 console_callback+0x393/0x3f0 drivers/tty/vt/vt.c:2835
 process_one_work+0x94b/0x1690 kernel/workqueue.c:2264
 worker_thread+0x96/0xe20 kernel/workqueue.c:2410
 kthread+0x357/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace cb8e24babcf15726 ]---
RIP: 0010:fbcon_cursor+0x10e/0x650 drivers/video/fbdev/core/fbcon.c:1387
Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e2 04 00 00 4c 8b bd a0 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 <0f> b6 14 02 4c 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 b1
RSP: 0018:ffffc90008157b38 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888218cd5000 RCX: ffffffff83dc7c80
RDX: 0000000020000000 RSI: ffffffff83b0cb09 RDI: ffff8880971453a0
RBP: ffff888097145000 R08: ffff8880a02d2300 R09: ffffed1014741664
R10: ffffed1014741663 R11: ffff8880a3a0b31f R12: ffff8880a39b4000
R13: 0000000000000001 R14: ffff8880a39b4468 R15: 0000000100000004
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fba234d8000 CR3: 0000000097c0b000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400