BUG: unable to handle kernel paging request at ffff888001000108 IP: __writel arch/x86/include/asm/io.h:71 [inline] IP: slow_imageblit drivers/video/fbdev/core/cfbimgblt.c:178 [inline] IP: cfb_imageblit+0xa30/0xe40 drivers/video/fbdev/core/cfbimgblt.c:302 PGD c9e2067 P4D c9e2067 PUD c9e3067 PMD 80000000010001e1 Oops: 0003 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 0 PID: 12449 Comm: syz-executor.0 Not tainted 4.14.281-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888099666400 task.stack: ffff88805c570000 RIP: 0010:__writel arch/x86/include/asm/io.h:71 [inline] RIP: 0010:slow_imageblit drivers/video/fbdev/core/cfbimgblt.c:178 [inline] RIP: 0010:cfb_imageblit+0xa30/0xe40 drivers/video/fbdev/core/cfbimgblt.c:302 RSP: 0018:ffff88805c577660 EFLAGS: 00010246 RAX: ffff88800100010c RBX: 000000000000001c RCX: ffffc90005bdc000 RDX: 0000000000040000 RSI: ffff888001000108 RDI: dffffc0000000000 RBP: 0000000000000000 R08: 0000000000000844 R09: 0000000000000000 R10: 0000000000000007 R11: 0000000000000000 R12: ffff88823884ced2 R13: 0000000000000000 R14: 0000000000000030 R15: 0000000000000000 FS: 00007f776bfce700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff888001000108 CR3: 00000000ac268000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1208 [inline] vga16fb_imageblit+0x630/0x2140 drivers/video/fbdev/vga16fb.c:1261 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline] bit_putcs+0x81e/0xc30 drivers/video/fbdev/core/bitblit.c:188 fbcon_putcs+0x2fe/0x480 drivers/video/fbdev/core/fbcon.c:1247 con_flush drivers/tty/vt/vt.c:2223 [inline] do_con_write+0x908/0x19b0 drivers/tty/vt/vt.c:2427 con_write+0x21/0xa0 drivers/tty/vt/vt.c:2822 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 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f776d659109 RSP: 002b:00007f776bfce168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f776d76bf60 RCX: 00007f776d659109 RDX: 0000000000001006 RSI: 0000000020001040 RDI: 0000000000000006 RBP: 00007f776d6b308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff7ccd352f R14: 00007f776bfce300 R15: 0000000000022000 Code: 45 7c 24 20 e8 42 3e 1b fe 89 d9 44 89 f8 d3 e0 41 09 c5 39 5c 24 08 0f 87 76 ff ff ff e8 29 3e 1b fe 48 8b 74 24 10 48 8d 46 04 <44> 89 2e 39 5c 24 08 0f 85 44 ff ff ff 45 31 ed 48 89 44 24 10 RIP: __writel arch/x86/include/asm/io.h:71 [inline] RSP: ffff88805c577660 RIP: slow_imageblit drivers/video/fbdev/core/cfbimgblt.c:178 [inline] RSP: ffff88805c577660 RIP: cfb_imageblit+0xa30/0xe40 drivers/video/fbdev/core/cfbimgblt.c:302 RSP: ffff88805c577660 CR2: ffff888001000108 ---[ end trace 74045257f89e11d8 ]--- ---------------- Code disassembly (best guess): 0: 45 7c 24 rex.RB jl 0x27 3: 20 e8 and %ch,%al 5: 42 rex.X 6: 3e 1b fe ds sbb %esi,%edi 9: 89 d9 mov %ebx,%ecx b: 44 89 f8 mov %r15d,%eax e: d3 e0 shl %cl,%eax 10: 41 09 c5 or %eax,%r13d 13: 39 5c 24 08 cmp %ebx,0x8(%rsp) 17: 0f 87 76 ff ff ff ja 0xffffff93 1d: e8 29 3e 1b fe callq 0xfe1b3e4b 22: 48 8b 74 24 10 mov 0x10(%rsp),%rsi 27: 48 8d 46 04 lea 0x4(%rsi),%rax * 2b: 44 89 2e mov %r13d,(%rsi) <-- trapping instruction 2e: 39 5c 24 08 cmp %ebx,0x8(%rsp) 32: 0f 85 44 ff ff ff jne 0xffffff7c 38: 45 31 ed xor %r13d,%r13d 3b: 48 89 44 24 10 mov %rax,0x10(%rsp)