print_req_error: I/O error, dev loop4, sector 0
Buffer I/O error on dev loop4, logical block 0, async page read
print_req_error: I/O error, dev loop4, sector 24
Buffer I/O error on dev loop4, logical block 3, async page read
==================================================================
BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:663 [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+0xab7/0xc30 drivers/video/fbdev/core/bitblit.c:185
Read of size 1 at addr ffffffff87cf60b9 by task syz-executor.2/17660

CPU: 1 PID: 17660 Comm: syz-executor.2 Not tainted 4.14.231-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x5/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load1_noabort+0x68/0x70 mm/kasan/report.c:427
 __fb_pad_aligned_buffer include/linux/fb.h:663 [inline]
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
 bit_putcs+0xab7/0xc30 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x2fe/0x480 drivers/video/fbdev/core/fbcon.c:1247
 do_update_region+0x34b/0x5b0 drivers/tty/vt/vt.c:373
 redraw_screen+0x56e/0x790 drivers/tty/vt/vt.c:705
 vc_do_resize+0xc08/0xe00 drivers/tty/vt/vt.c:974
 vt_ioctl+0x1884/0x1d50 drivers/tty/vt/vt_ioctl.c:905
 tty_ioctl+0x50f/0x13c0 drivers/tty/tty_io.c:2661
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x4665f9
RSP: 002b:00007f342b639188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9
RDX: 0000000020000000 RSI: 000000000000560a RDI: 0000000000000003
RBP: 00000000004bfbb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffeb6b5c17f R14: 00007f342b639300 R15: 0000000000022000

The buggy address belongs to the variable:
 oid_index+0x239/0x9a0

Memory state around the buggy address:
 ffffffff87cf5f80: fa fa fa fa 00 00 02 fa fa fa fa fa 00 03 fa fa
 ffffffff87cf6000: fa fa fa fa 06 fa fa fa fa fa fa fa 05 fa fa fa
>ffffffff87cf6080: fa fa fa fa 07 fa fa fa fa fa fa fa 00 01 fa fa
                                        ^
 ffffffff87cf6100: fa fa fa fa 00 05 fa fa fa fa fa fa 03 fa fa fa
 ffffffff87cf6180: fa fa fa fa 03 fa fa fa fa fa fa fa 03 fa fa fa
==================================================================