==================================================================
BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:674 [inline]
BUG: KASAN: global-out-of-bounds in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
BUG: KASAN: global-out-of-bounds in bit_putcs+0xbaf/0xd10 drivers/video/fbdev/core/bitblit.c:185
Read of size 1 at addr ffffffff88b66190 by task kworker/0:1/31482

CPU: 0 PID: 31482 Comm: kworker/0:1 Not tainted 4.19.164-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events console_callback
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
 print_address_description.cold+0x5/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load1_noabort+0x88/0x90 mm/kasan/report.c:430
 __fb_pad_aligned_buffer include/linux/fb.h:674 [inline]
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
 bit_putcs+0xbaf/0xd10 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x336/0x4f0 drivers/video/fbdev/core/fbcon.c:1269
 do_update_region+0x399/0x630 drivers/tty/vt/vt.c:683
 redraw_screen+0x5e1/0x870 drivers/tty/vt/vt.c:1031
 complete_change_console+0xf9/0x610 drivers/tty/vt/vt_ioctl.c:1296
 change_console+0x196/0x560 drivers/tty/vt/vt_ioctl.c:1421
 console_callback+0x393/0x3f0 drivers/tty/vt/vt.c:2837
 process_one_work+0x864/0x1570 kernel/workqueue.c:2155
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

The buggy address belongs to the variable:
 str__msr__trace_system_name+0x130/0xbc0

Memory state around the buggy address:
 ffffffff88b66080: fa fa fa fa 00 03 fa fa fa fa fa fa 05 fa fa fa
 ffffffff88b66100: fa fa fa fa 00 06 fa fa fa fa fa fa 00 00 00 03
>ffffffff88b66180: fa fa fa fa 00 02 fa fa fa fa fa fa 00 00 07 fa
                         ^
 ffffffff88b66200: fa fa fa fa 00 00 07 fa fa fa fa fa 00 00 01 fa
 ffffffff88b66280: fa fa fa fa 00 00 00 00 00 fa fa fa fa fa fa fa
==================================================================