TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies.  Check SNMP counters.
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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 ffffffff87cf6a50 by task syz-executor.5/20556

CPU: 1 PID: 20556 Comm: syz-executor.5 Not tainted 4.14.232-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
 fbcon_redraw.constprop.0+0x3e8/0x460 drivers/video/fbdev/core/fbcon.c:1624
 fbcon_scroll+0x381/0x31e0 drivers/video/fbdev/core/fbcon.c:1735
 con_scroll+0x2c5/0x360 drivers/tty/vt/vt.c:327
 lf+0x226/0x270 drivers/tty/vt/vt.c:1141
 do_con_trol+0x150/0x51e0 drivers/tty/vt/vt.c:1804
 do_con_write+0x9fb/0x19b0 drivers/tty/vt/vt.c:2454
 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2805
 process_output_block drivers/tty/n_tty.c:595 [inline]
 n_tty_write+0x352/0xda0 drivers/tty/n_tty.c:2333
 do_tty_write drivers/tty/tty_io.c:959 [inline]
 tty_write+0x410/0x740 drivers/tty/tty_io.c:1043
 __vfs_write+0xe4/0x630 fs/read_write.c:480
 __kernel_write+0xf5/0x330 fs/read_write.c:501
 write_pipe_buf+0x143/0x1c0 fs/splice.c:797
 splice_from_pipe_feed fs/splice.c:502 [inline]
 __splice_from_pipe+0x326/0x7a0 fs/splice.c:626
 splice_from_pipe fs/splice.c:661 [inline]
 default_file_splice_write+0xc5/0x150 fs/splice.c:809
 do_splice_from fs/splice.c:851 [inline]
 direct_splice_actor+0x115/0x160 fs/splice.c:1018
 splice_direct_to_actor+0x27c/0x730 fs/splice.c:973
 do_splice_direct+0x164/0x210 fs/splice.c:1061
 do_sendfile+0x47f/0xb30 fs/read_write.c:1441
 SYSC_sendfile64 fs/read_write.c:1502 [inline]
 SyS_sendfile64+0xff/0x110 fs/read_write.c:1488
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x4665f9
RSP: 002b:00007f5bb0e6b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006
RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000
R10: 0800000080004105 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffded84839f R14: 00007f5bb0e6b300 R15: 0000000000022000

The buggy address belongs to the variable:
 str__msr__trace_system_name+0x1f0/0xb00

Memory state around the buggy address:
 ffffffff87cf6900: fa fa fa fa 00 06 fa fa fa fa fa fa 00 00 00 03
 ffffffff87cf6980: fa fa fa fa 00 02 fa fa fa fa fa fa 00 00 07 fa
>ffffffff87cf6a00: fa fa fa fa 00 00 07 fa fa fa fa fa 00 00 01 fa
                                                 ^
 ffffffff87cf6a80: fa fa fa fa 00 00 02 fa fa fa fa fa 00 04 fa fa
 ffffffff87cf6b00: fa fa fa fa 00 02 fa fa fa fa fa fa 04 fa fa fa
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