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: 10509 Comm: kworker/0:0 Not tainted 5.6.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events console_callback
RIP: 0010:fbcon_cursor+0x114/0x660 drivers/video/fbdev/core/fbcon.c:1387
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e6 04 00 00 4d 8b b4 24 a0 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <0f> b6 14 02 4c 89 f0 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 ba
RSP: 0018:ffffc90002117af0 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888218ed2800 RCX: ffffffff83f36520
RDX: 0000000020000000 RSI: ffffffff83c6154c RDI: ffff88809f9fd3a0
RBP: ffffc90002117b30 R08: ffff88809fad03c0 R09: ffffed10431d9b3c
R10: ffffed10431d9b3b R11: ffff888218ecd9df R12: ffff88809f9fd000
R13: ffff888218ee6000 R14: 0000000100000004 R15: ffff888218ee6468
FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000acd128 CR3: 0000000091877000 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+0x1fb/0x280 drivers/tty/vt/vt.c:899
 redraw_screen+0x4e1/0x7d0 drivers/tty/vt/vt.c:1024
 complete_change_console+0x105/0x3a0 drivers/tty/vt/vt_ioctl.c:1269
 change_console+0x19b/0x2c0 drivers/tty/vt/vt_ioctl.c:1394
 console_callback+0x3a1/0x400 drivers/tty/vt/vt.c:2835
 process_one_work+0xa05/0x17a0 kernel/workqueue.c:2264
 worker_thread+0x98/0xe40 kernel/workqueue.c:2410
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 6a487c89bc1e4dd1 ]---
RIP: 0010:fbcon_cursor+0x114/0x660 drivers/video/fbdev/core/fbcon.c:1387
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e6 04 00 00 4d 8b b4 24 a0 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <0f> b6 14 02 4c 89 f0 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 ba
RSP: 0018:ffffc90002117af0 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888218ed2800 RCX: ffffffff83f36520
RDX: 0000000020000000 RSI: ffffffff83c6154c RDI: ffff88809f9fd3a0
RBP: ffffc90002117b30 R08: ffff88809fad03c0 R09: ffffed10431d9b3c
R10: ffffed10431d9b3b R11: ffff888218ecd9df R12: ffff88809f9fd000
R13: ffff888218ee6000 R14: 0000000100000004 R15: ffff888218ee6468
FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000acd128 CR3: 0000000091877000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400