BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 7 scanned by syz-executor.2 (2543) BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 7 scanned by systemd-udevd (2550) BUG: unable to handle kernel paging request at ffff8880ff4a2b80 PGD de01067 P4D de01067 PUD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 1 PID: 2437 Comm: syz-executor.5 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_8planes_imageblit drivers/video/fbdev/vga16fb.c:1133 [inline] RIP: 0010:vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1203 [inline] RIP: 0010:vga16fb_imageblit+0x155e/0x2260 drivers/video/fbdev/vga16fb.c:1260 Code: 89 e2 48 c1 ea 03 0f b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 0c 84 d2 74 08 4c 89 e7 e8 29 da f9 fd 48 8b 04 24 8b 40 14 <88> 45 00 8a 45 00 b8 08 00 00 00 ba ce 03 00 00 ee 48 c7 c2 10 82 RSP: 0018:ffff8880aa42eff8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00000000ff402b80 RCX: ffffc9000783e000 RDX: 0000000000000000 RSI: ffffffff839e8439 RDI: 0000000000000005 RBP: ffff8880ff4a2b80 R08: 00000000ffff801d R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880aa42f19c R13: ffff8880b0658680 R14: ffff8880000a0000 R15: 0000000000000002 FS: 00007f3750be8700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880ff4a2b80 CR3: 00000000af195000 CR4: 00000000003406e0 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+0x6e2/0xd10 drivers/video/fbdev/core/bitblit.c:188 fbcon_putcs+0x336/0x4f0 drivers/video/fbdev/core/fbcon.c:1269 con_flush drivers/tty/vt/vt.c:2577 [inline] do_con_write+0xd0e/0x1d90 drivers/tty/vt/vt.c:2830 con_put_char+0x96/0xe0 drivers/tty/vt/vt.c:3173 tty_put_char+0xb7/0x150 drivers/tty/tty_io.c:2892 do_output_char+0x155/0x850 drivers/tty/n_tty.c:486 process_output drivers/tty/n_tty.c:512 [inline] n_tty_write+0x46e/0xff0 drivers/tty/n_tty.c:2343 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x496/0x810 drivers/tty/tty_io.c:1044 __vfs_write+0xf7/0x770 fs/read_write.c:485 __kernel_write+0x109/0x370 fs/read_write.c:506 write_pipe_buf+0x153/0x1f0 fs/splice.c:798 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x389/0x800 fs/splice.c:627 splice_from_pipe fs/splice.c:662 [inline] default_file_splice_write+0xd8/0x180 fs/splice.c:810 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x115/0x160 fs/splice.c:1025 splice_direct_to_actor+0x33f/0x8d0 fs/splice.c:980 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f37522730e9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3750be8168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f3752385f60 RCX: 00007f37522730e9 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 00007f37522cd08d R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000a808 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc0f7af46f R14: 00007f3750be8300 R15: 0000000000022000 Modules linked in: CR2: ffff8880ff4a2b80 ---[ end trace 1cb328f9ffbfccfc ]--- RIP: 0010:writeb arch/x86/include/asm/io.h:65 [inline] RIP: 0010:vga_8planes_imageblit drivers/video/fbdev/vga16fb.c:1133 [inline] RIP: 0010:vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1203 [inline] RIP: 0010:vga16fb_imageblit+0x155e/0x2260 drivers/video/fbdev/vga16fb.c:1260 Code: 89 e2 48 c1 ea 03 0f b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 0c 84 d2 74 08 4c 89 e7 e8 29 da f9 fd 48 8b 04 24 8b 40 14 <88> 45 00 8a 45 00 b8 08 00 00 00 ba ce 03 00 00 ee 48 c7 c2 10 82 RSP: 0018:ffff8880aa42eff8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00000000ff402b80 RCX: ffffc9000783e000 RDX: 0000000000000000 RSI: ffffffff839e8439 RDI: 0000000000000005 RBP: ffff8880ff4a2b80 R08: 00000000ffff801d R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880aa42f19c R13: ffff8880b0658680 R14: ffff8880000a0000 R15: 0000000000000002 FS: 00007f3750be8700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880ff4a2b80 CR3: 00000000af195000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 e2 mov %esp,%edx 2: 48 c1 ea 03 shr $0x3,%rdx 6: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx a: 4c 89 e0 mov %r12,%rax d: 83 e0 07 and $0x7,%eax 10: 83 c0 03 add $0x3,%eax 13: 38 d0 cmp %dl,%al 15: 7c 0c jl 0x23 17: 84 d2 test %dl,%dl 19: 74 08 je 0x23 1b: 4c 89 e7 mov %r12,%rdi 1e: e8 29 da f9 fd callq 0xfdf9da4c 23: 48 8b 04 24 mov (%rsp),%rax 27: 8b 40 14 mov 0x14(%rax),%eax * 2a: 88 45 00 mov %al,0x0(%rbp) <-- trapping instruction 2d: 8a 45 00 mov 0x0(%rbp),%al 30: b8 08 00 00 00 mov $0x8,%eax 35: ba ce 03 00 00 mov $0x3ce,%edx 3a: ee out %al,(%dx) 3b: 48 rex.W 3c: c7 .byte 0xc7 3d: c2 10 82 retq $0x8210