BUG: unable to handle page fault for address: ffff888001000040 #PF: supervisor write access in kernel mode #PF: error_code(0x0003) - permissions violation PGD 10c01067 P4D 10c01067 PUD 10c02067 PMD 80000000010001e1 Oops: 0003 [#1] PREEMPT SMP KASAN CPU: 1 PID: 1690 Comm: syz-executor.4 Not tainted 5.12.0-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+0xbd7/0x2200 drivers/video/fbdev/vga16fb.c:1260 Code: 83 c5 01 48 89 f8 48 89 f9 48 83 c3 01 48 c1 e8 03 83 e1 07 42 0f b6 04 20 38 c8 7f 08 84 c0 0f 85 27 0f 00 00 41 0f b6 45 ff <88> 02 44 89 f6 31 ff 44 29 ee e8 3a 6b 74 fd 49 39 ed 75 b6 4c 89 RSP: 0018:ffffc90017407588 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888001000041 RCX: 0000000000000004 RDX: ffff888001000040 RSI: ffffffff83fffa46 RDI: ffff8880182ed974 RBP: ffff8880182ed975 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff83fffa2b R11: 0000000000000001 R12: dffffc0000000000 R13: ffff8880182ed975 R14: 00000000182ed975 R15: 0000000000000004 FS: 00007faabb0bb700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff888001000040 CR3: 000000001d767000 CR4: 0000000000350ee0 Call Trace: bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline] bit_putcs+0x6e1/0xd20 drivers/video/fbdev/core/bitblit.c:188 fbcon_putcs+0x35a/0x450 drivers/video/fbdev/core/fbcon.c:1296 do_update_region+0x399/0x630 drivers/tty/vt/vt.c:676 redraw_screen+0x61f/0x740 drivers/tty/vt/vt.c:1035 fbcon_blank+0x8c5/0xc30 drivers/video/fbdev/core/fbcon.c:2207 do_unblank_screen+0x25b/0x470 drivers/tty/vt/vt.c:4406 vt_kdsetmode drivers/tty/vt/vt_ioctl.c:276 [inline] vt_k_ioctl drivers/tty/vt/vt_ioctl.c:381 [inline] vt_ioctl+0x1ab3/0x27f0 drivers/tty/vt/vt_ioctl.c:713 tty_ioctl+0xe4d/0x1600 drivers/tty/tty_io.c:2805 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl fs/ioctl.c:1055 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007faabb0bb188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000000004b3a RDI: 0000000000000003 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd6d31c32f R14: 00007faabb0bb300 R15: 0000000000022000 Modules linked in: CR2: ffff888001000040 ---[ end trace ce4b1c394960f322 ]--- 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+0xbd7/0x2200 drivers/video/fbdev/vga16fb.c:1260 Code: 83 c5 01 48 89 f8 48 89 f9 48 83 c3 01 48 c1 e8 03 83 e1 07 42 0f b6 04 20 38 c8 7f 08 84 c0 0f 85 27 0f 00 00 41 0f b6 45 ff <88> 02 44 89 f6 31 ff 44 29 ee e8 3a 6b 74 fd 49 39 ed 75 b6 4c 89 RSP: 0018:ffffc90017407588 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888001000041 RCX: 0000000000000004 RDX: ffff888001000040 RSI: ffffffff83fffa46 RDI: ffff8880182ed974 RBP: ffff8880182ed975 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff83fffa2b R11: 0000000000000001 R12: dffffc0000000000 R13: ffff8880182ed975 R14: 00000000182ed975 R15: 0000000000000004 FS: 00007faabb0bb700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff888001000040 CR3: 000000001d767000 CR4: 0000000000350ee0