BUG: unable to handle page fault for address: ffff888001000040 #PF: supervisor write access in kernel mode #PF: error_code(0x0003) - permissions violation PGD f601067 P4D f601067 PUD f602067 PMD 80000000010001e1 Oops: 0003 [#1] PREEMPT SMP KASAN CPU: 1 PID: 10215 Comm: syz-executor.5 Not tainted 5.9.0-rc6-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+0xacd/0x2260 drivers/video/fbdev/vga16fb.c:1260 Code: 48 89 f8 49 89 f9 4c 8d 67 01 48 c1 e8 03 41 83 e1 07 42 0f b6 04 18 44 38 c8 7f 08 84 c0 0f 85 95 0e 00 00 41 0f b6 44 24 ff <88> 45 00 4d 39 f8 4c 89 fd 4c 89 e7 75 c4 4d 63 ed 4f 8d 74 2e 01 RSP: 0018:ffffc9000abf74a8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffc9000abf7638 RCX: ffff888001000040 RDX: 0000000000000004 RSI: 0000000000000007 RDI: ffff8882388f8868 RBP: ffff888001000040 R08: ffff888001000042 R09: 0000000000000000 R10: fffff5200157eec8 R11: dffffc0000000000 R12: ffff8882388f8869 R13: 0000000000000001 R14: ffff8882388f8868 R15: ffff888001000041 FS: 00007fd221fca700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff888001000040 CR3: 0000000088ec6000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline] bit_putcs+0x60f/0xbc0 drivers/video/fbdev/core/bitblit.c:188 fbcon_putcs+0x35d/0x5d0 drivers/video/fbdev/core/fbcon.c:1308 do_update_region+0x2d8/0x5c0 drivers/tty/vt/vt.c:676 redraw_screen+0x567/0x710 drivers/tty/vt/vt.c:1035 fbcon_blank+0x857/0xb60 drivers/video/fbdev/core/fbcon.c:2252 do_unblank_screen drivers/tty/vt/vt.c:4406 [inline] do_unblank_screen+0x1de/0x3b0 drivers/tty/vt/vt.c:4374 vt_kdsetmode drivers/tty/vt/vt_ioctl.c:276 [inline] vt_k_ioctl drivers/tty/vt/vt_ioctl.c:381 [inline] vt_ioctl+0xde2/0x2610 drivers/tty/vt/vt_ioctl.c:814 tty_ioctl+0x461/0x1220 drivers/tty/tty_io.c:2654 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x120/0x190 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 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:00007fd221fca188 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: 00007ffdec20eaaf R14: 00007fd221fca300 R15: 0000000000022000 Modules linked in: CR2: ffff888001000040 ---[ end trace 1d8347ac81ff754b ]--- 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+0xacd/0x2260 drivers/video/fbdev/vga16fb.c:1260 Code: 48 89 f8 49 89 f9 4c 8d 67 01 48 c1 e8 03 41 83 e1 07 42 0f b6 04 18 44 38 c8 7f 08 84 c0 0f 85 95 0e 00 00 41 0f b6 44 24 ff <88> 45 00 4d 39 f8 4c 89 fd 4c 89 e7 75 c4 4d 63 ed 4f 8d 74 2e 01 RSP: 0018:ffffc9000abf74a8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffc9000abf7638 RCX: ffff888001000040 RDX: 0000000000000004 RSI: 0000000000000007 RDI: ffff8882388f8868 RBP: ffff888001000040 R08: ffff888001000042 R09: 0000000000000000 R10: fffff5200157eec8 R11: dffffc0000000000 R12: ffff8882388f8869 R13: 0000000000000001 R14: ffff8882388f8868 R15: ffff888001000041 FS: 00007fd221fca700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff888001000040 CR3: 0000000088ec6000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400