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BUG: KMSAN: uninit-value in vga_8planes_imageblit drivers/video/fbdev/vga16fb.c:1140 [inline]
BUG: KMSAN: uninit-value in vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1203 [inline]
BUG: KMSAN: uninit-value in vga16fb_imageblit+0x707/0x1b20 drivers/video/fbdev/vga16fb.c:1260
CPU: 1 PID: 4962 Comm: syz-executor.3 Not tainted 5.9.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:122
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:201
 vga_8planes_imageblit drivers/video/fbdev/vga16fb.c:1140 [inline]
 vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1203 [inline]
 vga16fb_imageblit+0x707/0x1b20 drivers/video/fbdev/vga16fb.c:1260
 bit_putcs+0x3129/0x33b0 drivers/video/fbdev/core/bitblit.c:139
 fbcon_putcs+0x122e/0x1260 drivers/video/fbdev/core/fbcon.c:1308
 con_flush drivers/tty/vt/vt.c:2575 [inline]
 do_con_write+0x4460/0x12470 drivers/tty/vt/vt.c:2905
 con_write+0x9c/0x190 drivers/tty/vt/vt.c:3250
 process_output_block drivers/tty/n_tty.c:595 [inline]
 n_tty_write+0x1657/0x21e0 drivers/tty/n_tty.c:2333
 do_tty_write drivers/tty/tty_io.c:962 [inline]
 tty_write+0x99d/0x1590 drivers/tty/tty_io.c:1046
 vfs_write+0x69e/0x1870 fs/read_write.c:584
 ksys_write+0x2af/0x4d0 fs/read_write.c:639
 __do_sys_write fs/read_write.c:651 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:648
 __ia32_sys_write+0x4a/0x70 fs/read_write.c:648
 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline]
 __do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fa9549
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f55a30cc EFLAGS: 00000296 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000080
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:129 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:297
 __msan_chain_origin+0x57/0xa0 mm/kmsan/kmsan_instr.c:151
 __fb_pad_aligned_buffer include/linux/fb.h:654 [inline]
 bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline]
 bit_putcs+0x2723/0x33b0 drivers/video/fbdev/core/bitblit.c:185
 fbcon_putcs+0x122e/0x1260 drivers/video/fbdev/core/fbcon.c:1308
 con_flush drivers/tty/vt/vt.c:2575 [inline]
 do_con_write+0x4460/0x12470 drivers/tty/vt/vt.c:2905
 con_write+0x9c/0x190 drivers/tty/vt/vt.c:3250
 process_output_block drivers/tty/n_tty.c:595 [inline]
 n_tty_write+0x1657/0x21e0 drivers/tty/n_tty.c:2333
 do_tty_write drivers/tty/tty_io.c:962 [inline]
 tty_write+0x99d/0x1590 drivers/tty/tty_io.c:1046
 vfs_write+0x69e/0x1870 fs/read_write.c:584
 ksys_write+0x2af/0x4d0 fs/read_write.c:639
 __do_sys_write fs/read_write.c:651 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:648
 __ia32_sys_write+0x4a/0x70 fs/read_write.c:648
 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline]
 __do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:129 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:112
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:80
 slab_alloc_node mm/slub.c:2903 [inline]
 slab_alloc mm/slub.c:2912 [inline]
 __kmalloc+0x282/0x490 mm/slub.c:3978
 kmalloc include/linux/slab.h:559 [inline]
 fbcon_set_font+0x5ac/0xf40 drivers/video/fbdev/core/fbcon.c:2496
 con_font_set drivers/tty/vt/vt.c:4663 [inline]
 con_font_op+0x204e/0x21b0 drivers/tty/vt/vt.c:4728
 vt_io_ioctl drivers/tty/vt/vt_ioctl.c:586 [inline]
 vt_ioctl+0x14b2/0x67e0 drivers/tty/vt/vt_ioctl.c:856
 vt_compat_ioctl+0x5cb/0x1030 drivers/tty/vt/vt_ioctl.c:1257
 tty_compat_ioctl+0x74b/0x1660 drivers/tty/tty_io.c:2847
 __do_compat_sys_ioctl fs/ioctl.c:842 [inline]
 __se_compat_sys_ioctl+0x53d/0x1100 fs/ioctl.c:793
 __ia32_compat_sys_ioctl+0x4a/0x70 fs/ioctl.c:793
 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline]
 __do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
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