kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 7589 Comm: kworker/0:3 Not tainted 4.14.172-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events console_callback
task: ffff88807dc56400 task.stack: ffff888057a78000
RIP: 0010:fbcon_cursor+0x10e/0x690 drivers/video/fbdev/core/fbcon.c:1325
RSP: 0018:ffff888057a7fba8 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffff888219287300 RCX: 1ffffffff15f0570
RDX: 0000000020000000 RSI: 0000000000000001 RDI: ffff88808d6296a0
RBP: ffff88808d629300 R08: 000000000000ffff R09: ffffed1043251e0c
R10: ffffed1043251e0b R11: ffff88821928f05f R12: ffff8882192ab580
R13: 0000000000000001 R14: 0000000100000004 R15: ffff8882192ab9f0
FS:  0000000000000000(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007facbc57c000 CR3: 00000000a4c81000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 set_cursor drivers/tty/vt/vt.c:602 [inline]
 set_cursor+0x1aa/0x220 drivers/tty/vt/vt.c:593
 redraw_screen+0x56e/0x770 drivers/tty/vt/vt.c:706
 complete_change_console+0xf9/0x350 drivers/tty/vt/vt_ioctl.c:1282
 change_console+0x156/0x270 drivers/tty/vt/vt_ioctl.c:1407
 console_callback+0x32c/0x380 drivers/tty/vt/vt.c:2460
 process_one_work+0x813/0x1540 kernel/workqueue.c:2114
 worker_thread+0x5d1/0x1070 kernel/workqueue.c:2248
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 43 05 00 00 4c 8b b5 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 
RIP: fbcon_cursor+0x10e/0x690 drivers/video/fbdev/core/fbcon.c:1325 RSP: ffff888057a7fba8
---[ end trace 0b4f8d1b3905a008 ]---