BUG: unable to handle page fault for address: ffff888001000000 #PF: supervisor write access in kernel mode #PF: error_code(0x0003) - permissions violation PGD 10601067 P4D 10601067 PUD 10602067 PMD 80000000010001e1 Oops: 0003 [#1] PREEMPT SMP KASAN CPU: 0 PID: 18062 Comm: syz-executor.5 Not tainted 5.14.0-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:vga16fb_fillrect+0x993/0x18d0 drivers/video/fbdev/vga16fb.c:923 Code: 68 fd 48 63 44 24 10 45 31 f6 48 89 04 24 e8 04 69 68 fd 31 ff 89 de 31 ed e8 39 70 68 fd 85 db 4d 89 ec 74 22 e8 ed 68 68 fd <45> 88 34 24 83 c5 01 89 df 49 83 c4 01 89 ee e8 09 71 68 fd 39 eb RSP: 0018:ffffc900014cefa0 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 00000000000000a0 RCX: ffffc90014178000 RDX: 0000000000040000 RSI: ffffffff840d4013 RDI: 0000000000000003 RBP: 0000000000000060 R08: 00000000000000a0 R09: ffffffff840d399d R10: ffffffff840d4027 R11: 0000000000000000 R12: ffff888001000000 R13: ffff888000ffffa0 R14: 0000000000000000 R15: 000000003ffe7666 FS: 00007f6c49f36700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff888001000000 CR3: 00000000307b2000 CR4: 0000000000350ef0 Call Trace: bit_clear+0x3cc/0x4f0 drivers/video/fbdev/core/bitblit.c:74 fbcon_clear+0x529/0x5f0 drivers/video/fbdev/core/fbcon.c:1285 fbcon_scroll+0x1dbb/0x3580 drivers/video/fbdev/core/fbcon.c:1784 con_scroll+0x5b9/0x6d0 drivers/tty/vt/vt.c:630 lf+0x26b/0x2c0 drivers/tty/vt/vt.c:1490 do_con_trol+0x20f/0x54c0 drivers/tty/vt/vt.c:2170 do_con_write+0xd9d/0x1e40 drivers/tty/vt/vt.c:2911 con_write+0x21/0x40 drivers/tty/vt/vt.c:3255 do_output_char+0x5de/0x850 drivers/tty/n_tty.c:444 process_output drivers/tty/n_tty.c:511 [inline] n_tty_write+0x4c3/0xfd0 drivers/tty/n_tty.c:2300 do_tty_write drivers/tty/tty_io.c:1038 [inline] file_tty_write.constprop.0+0x526/0x910 drivers/tty/tty_io.c:1110 call_write_iter include/linux/fs.h:2114 [inline] do_iter_readv_writev+0x46f/0x740 fs/read_write.c:740 do_iter_write+0x188/0x670 fs/read_write.c:866 vfs_iter_write+0x70/0xa0 fs/read_write.c:907 iter_file_splice_write+0x723/0xc70 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x110/0x180 fs/splice.c:936 splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891 do_splice_direct+0x1b3/0x280 fs/splice.c:979 do_sendfile+0x9f0/0x1120 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1311 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 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:00007f6c49f36188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0800000080004103 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffe6c598cdf R14: 00007f6c49f36300 R15: 0000000000022000 Modules linked in: CR2: ffff888001000000 ---[ end trace 4f4864d08c63724c ]--- RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline] RIP: 0010:vga16fb_fillrect+0x993/0x18d0 drivers/video/fbdev/vga16fb.c:923 Code: 68 fd 48 63 44 24 10 45 31 f6 48 89 04 24 e8 04 69 68 fd 31 ff 89 de 31 ed e8 39 70 68 fd 85 db 4d 89 ec 74 22 e8 ed 68 68 fd <45> 88 34 24 83 c5 01 89 df 49 83 c4 01 89 ee e8 09 71 68 fd 39 eb RSP: 0018:ffffc900014cefa0 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 00000000000000a0 RCX: ffffc90014178000 RDX: 0000000000040000 RSI: ffffffff840d4013 RDI: 0000000000000003 RBP: 0000000000000060 R08: 00000000000000a0 R09: ffffffff840d399d R10: ffffffff840d4027 R11: 0000000000000000 R12: ffff888001000000 R13: ffff888000ffffa0 R14: 0000000000000000 R15: 000000003ffe7666 FS: 00007f6c49f36700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff888001000000 CR3: 00000000307b2000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 68 fd 48 63 44 pushq $0x446348fd 5: 24 10 and $0x10,%al 7: 45 31 f6 xor %r14d,%r14d a: 48 89 04 24 mov %rax,(%rsp) e: e8 04 69 68 fd callq 0xfd686917 13: 31 ff xor %edi,%edi 15: 89 de mov %ebx,%esi 17: 31 ed xor %ebp,%ebp 19: e8 39 70 68 fd callq 0xfd687057 1e: 85 db test %ebx,%ebx 20: 4d 89 ec mov %r13,%r12 23: 74 22 je 0x47 25: e8 ed 68 68 fd callq 0xfd686917 * 2a: 45 88 34 24 mov %r14b,(%r12) <-- trapping instruction 2e: 83 c5 01 add $0x1,%ebp 31: 89 df mov %ebx,%edi 33: 49 83 c4 01 add $0x1,%r12 37: 89 ee mov %ebp,%esi 39: e8 09 71 68 fd callq 0xfd687147 3e: 39 eb cmp %ebp,%ebx