BUG: unable to handle kernel paging request at ffff88800100001a PGD de01067 P4D de01067 PUD de02067 PMD 80000000010001e1 Oops: 0003 [#1] PREEMPT SMP KASAN CPU: 0 PID: 29909 Comm: agetty Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline] RIP: 0010:vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1176 [inline] RIP: 0010:vga16fb_imageblit+0xc2f/0x2260 drivers/video/fbdev/vga16fb.c:1260 Code: 48 83 c5 01 48 89 f8 48 89 f9 48 83 c3 01 48 c1 e8 03 83 e1 07 42 0f b6 04 38 38 c8 7f 08 84 c0 0f 85 86 0f 00 00 0f b6 45 ff <88> 02 44 89 e6 31 ff 29 de e8 53 08 c4 fd 4c 39 eb 75 b8 48 8b 7c RSP: 0018:ffff88809b9ff6e0 EFLAGS: 00010246 RAX: 00000000000000ff RBX: ffff88800100001b RCX: 0000000000000006 RDX: ffff88800100001a RSI: ffffffff839e7e4f RDI: ffff8880b0769286 RBP: ffff8880b0769287 R08: ffff8880b076928f R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 000000000100001b R13: ffff88800100001b R14: ffff88800100001a R15: dffffc0000000000 FS: 00007ff0b4f06500(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88800100001a CR3: 000000003cdfc000 CR4: 00000000003426f0 DR0: 0080ffff00000000 DR1: 0080ffff00000000 DR2: 0080ffff00000000 DR3: 0080ffff00000000 DR6: 00000000fffe0ff0 DR7: 00000000dddd06aa Call Trace: soft_cursor+0x514/0xa30 drivers/video/fbdev/core/softcursor.c:74 bit_cursor+0x1126/0x1740 drivers/video/fbdev/core/bitblit.c:377 fbcon_cursor+0x531/0x710 drivers/video/fbdev/core/fbcon.c:1312 set_cursor drivers/tty/vt/vt.c:915 [inline] set_cursor+0x1dd/0x230 drivers/tty/vt/vt.c:906 con_flush_chars drivers/tty/vt/vt.c:3243 [inline] con_flush_chars drivers/tty/vt/vt.c:3232 [inline] con_write+0x8f/0xb0 drivers/tty/vt/vt.c:3164 do_output_char+0x5de/0x850 drivers/tty/n_tty.c:445 __process_echoes+0x38e/0x9f0 drivers/tty/n_tty.c:737 flush_echoes drivers/tty/n_tty.c:827 [inline] __receive_buf drivers/tty/n_tty.c:1646 [inline] n_tty_receive_buf_common+0xc0c/0x2a90 drivers/tty/n_tty.c:1740 tiocsti drivers/tty/tty_io.c:2193 [inline] tty_ioctl+0x1026/0x1630 drivers/tty/tty_io.c:2580 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff0b4a29017 Code: 00 00 00 48 8b 05 81 7e 2b 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 51 7e 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffc5f47d188 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffc5f47d3a7 RCX: 00007ff0b4a29017 RDX: 00007ffc5f47d3a6 RSI: 0000000000005412 RDI: 0000000000000000 RBP: 00007ffc5f47d3d5 R08: ffffffffffffff98 R09: 00007ffc5f47d200 R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc5f47d1a4 R13: 00007ffc5f47d300 R14: 00007ffc5f47d200 R15: 0000000000000000 Modules linked in: CR2: ffff88800100001a ---[ end trace 209b3d2424ae9651 ]--- RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline] RIP: 0010:vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1176 [inline] RIP: 0010:vga16fb_imageblit+0xc2f/0x2260 drivers/video/fbdev/vga16fb.c:1260 Code: 48 83 c5 01 48 89 f8 48 89 f9 48 83 c3 01 48 c1 e8 03 83 e1 07 42 0f b6 04 38 38 c8 7f 08 84 c0 0f 85 86 0f 00 00 0f b6 45 ff <88> 02 44 89 e6 31 ff 29 de e8 53 08 c4 fd 4c 39 eb 75 b8 48 8b 7c RSP: 0018:ffff88809b9ff6e0 EFLAGS: 00010246 RAX: 00000000000000ff RBX: ffff88800100001b RCX: 0000000000000006 RDX: ffff88800100001a RSI: ffffffff839e7e4f RDI: ffff8880b0769286 RBP: ffff8880b0769287 R08: ffff8880b076928f R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 000000000100001b R13: ffff88800100001b R14: ffff88800100001a R15: dffffc0000000000 FS: 00007ff0b4f06500(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88800100001a CR3: 000000003cdfc000 CR4: 00000000003426f0 DR0: 0080ffff00000000 DR1: 0080ffff00000000 DR2: 0080ffff00000000 DR3: 0080ffff00000000 DR6: 00000000fffe0ff0 DR7: 00000000dddd06aa ---------------- Code disassembly (best guess): 0: 48 83 c5 01 add $0x1,%rbp 4: 48 89 f8 mov %rdi,%rax 7: 48 89 f9 mov %rdi,%rcx a: 48 83 c3 01 add $0x1,%rbx e: 48 c1 e8 03 shr $0x3,%rax 12: 83 e1 07 and $0x7,%ecx 15: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax 1a: 38 c8 cmp %cl,%al 1c: 7f 08 jg 0x26 1e: 84 c0 test %al,%al 20: 0f 85 86 0f 00 00 jne 0xfac 26: 0f b6 45 ff movzbl -0x1(%rbp),%eax * 2a: 88 02 mov %al,(%rdx) <-- trapping instruction 2c: 44 89 e6 mov %r12d,%esi 2f: 31 ff xor %edi,%edi 31: 29 de sub %ebx,%esi 33: e8 53 08 c4 fd callq 0xfdc4088b 38: 4c 39 eb cmp %r13,%rbx 3b: 75 b8 jne 0xfffffff5 3d: 48 rex.W 3e: 8b .byte 0x8b 3f: 7c .byte 0x7c