kvm [16259]: vcpu0, guest rIP: 0x13c Hyper-V uhandled wrmsr: 0x40000024 data 0xf
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BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer syzkaller/managers/linux-4-14/kernel/./include/linux/fb.h:663 [inline]
BUG: KASAN: global-out-of-bounds in bit_putcs_aligned syzkaller/managers/linux-4-14/kernel/drivers/video/fbdev/core/bitblit.c:96 [inline]
BUG: KASAN: global-out-of-bounds in bit_putcs+0xab7/0xc30 syzkaller/managers/linux-4-14/kernel/drivers/video/fbdev/core/bitblit.c:185
Read of size 1 at addr ffffffff87cf5552 by task syz-executor.0/16284

CPU: 0 PID: 16284 Comm: syz-executor.0 Not tainted 4.14.218-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:58
 print_address_description.cold+0x5/0x1d3 syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:351
 kasan_report syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:409 [inline]
 __asan_report_load1_noabort+0x68/0x70 syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:427
 __fb_pad_aligned_buffer syzkaller/managers/linux-4-14/kernel/./include/linux/fb.h:663 [inline]
 bit_putcs_aligned syzkaller/managers/linux-4-14/kernel/drivers/video/fbdev/core/bitblit.c:96 [inline]
 bit_putcs+0xab7/0xc30 syzkaller/managers/linux-4-14/kernel/drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x2fe/0x480 syzkaller/managers/linux-4-14/kernel/drivers/video/fbdev/core/fbcon.c:1247
 con_flush syzkaller/managers/linux-4-14/kernel/drivers/tty/vt/vt.c:2206 [inline]
 do_con_write+0x9dd/0x19b0 syzkaller/managers/linux-4-14/kernel/drivers/tty/vt/vt.c:2453
 con_write+0x21/0xa0 syzkaller/managers/linux-4-14/kernel/drivers/tty/vt/vt.c:2805
 n_tty_write+0x85e/0xda0 syzkaller/managers/linux-4-14/kernel/drivers/tty/n_tty.c:2356
 do_tty_write syzkaller/managers/linux-4-14/kernel/drivers/tty/tty_io.c:959 [inline]
 tty_write+0x410/0x740 syzkaller/managers/linux-4-14/kernel/drivers/tty/tty_io.c:1043
 do_loop_readv_writev syzkaller/managers/linux-4-14/kernel/fs/read_write.c:698 [inline]
 do_loop_readv_writev syzkaller/managers/linux-4-14/kernel/fs/read_write.c:682 [inline]
 do_iter_write+0x3da/0x550 syzkaller/managers/linux-4-14/kernel/fs/read_write.c:956
 vfs_writev+0x125/0x290 syzkaller/managers/linux-4-14/kernel/fs/read_write.c:999
 do_writev+0xfc/0x2c0 syzkaller/managers/linux-4-14/kernel/fs/read_write.c:1034
 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x465b09
RSP: 002b:00007f158be01188 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09
RDX: 0000000000000002 RSI: 0000000020000a80 RDI: 0000000000000004
RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007fff7c29d54f R14: 00007f158be01300 R15: 0000000000022000

The buggy address belongs to the variable:
 str__msr__trace_system_name+0xf2/0xb00

Memory state around the buggy address:
 ffffffff87cf5400: fa fa fa fa 00 03 fa fa fa fa fa fa 04 fa fa fa
 ffffffff87cf5480: fa fa fa fa 00 03 fa fa fa fa fa fa 05 fa fa fa
>ffffffff87cf5500: fa fa fa fa 00 06 fa fa fa fa fa fa 00 00 00 03
                                                 ^
 ffffffff87cf5580: fa fa fa fa 00 02 fa fa fa fa fa fa 00 00 07 fa
 ffffffff87cf5600: fa fa fa fa 00 00 07 fa fa fa fa fa 00 00 01 fa
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