attempt to access beyond end of device loop3: rw=4096, want=2064, limit=267 BTRFS error (device loop3): failed to read chunk root BTRFS error (device loop3): open_ctree failed ================================================================== BUG: KASAN: slab-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:674 [inline] BUG: KASAN: slab-out-of-bounds in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] BUG: KASAN: slab-out-of-bounds in bit_putcs+0xbe2/0xd35 drivers/video/fbdev/core/bitblit.c:185 Read of size 1 at addr ffff88804c8ab7a4 by task syz-executor.1/20745 CPU: 0 PID: 20745 Comm: syz-executor.1 Not tainted 4.19.152-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x22c/0x33e lib/dump_stack.c:118 print_address_description.cold+0x56/0x25c mm/kasan/report.c:256 kasan_report_error.cold+0x66/0xb9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load1_noabort+0x88/0x90 mm/kasan/report.c:430 __fb_pad_aligned_buffer include/linux/fb.h:674 [inline] bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] bit_putcs+0xbe2/0xd35 drivers/video/fbdev/core/bitblit.c:185 fbcon_putcs+0x389/0x5d0 drivers/video/fbdev/core/fbcon.c:1269 do_update_region+0x2d0/0x660 drivers/tty/vt/vt.c:673 update_region+0x144/0x190 drivers/tty/vt/vt.c:701 vcs_write+0x41d/0xd00 drivers/tty/vt/vc_screen.c:604 __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+0x3af/0x820 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+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45de59 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0e5a756c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000027ec0 RCX: 000000000045de59 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 000000000118bf68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000010054 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffe1ffc811f R14: 00007f0e5a7579c0 R15: 000000000118bf2c Allocated by task 3674: __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x4f0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] fbcon_set_font+0x421/0xc60 drivers/video/fbdev/core/fbcon.c:2479 con_font_set drivers/tty/vt/vt.c:4537 [inline] con_font_op+0xd2b/0x1140 drivers/tty/vt/vt.c:4602 vt_ioctl+0x128c/0x2af0 drivers/tty/vt/vt_ioctl.c:938 tty_ioctl+0x5b0/0x1420 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 6514: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x250 mm/slab.c:3822 __rcu_reclaim kernel/rcu/rcu.h:236 [inline] rcu_do_batch kernel/rcu/tree.c:2584 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline] rcu_process_callbacks+0x948/0x1d00 kernel/rcu/tree.c:2881 __do_softirq+0x27d/0xad2 kernel/softirq.c:292 The buggy address belongs to the object at ffff88804c8ab580 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 36 bytes to the right of 512-byte region [ffff88804c8ab580, ffff88804c8ab780) The buggy address belongs to the page: page:ffffea0001322ac0 count:1 mapcount:0 mapping:ffff88812c3f6940 index:0xffff88804c8ab800 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea00026e8a08 ffffea00021fc248 ffff88812c3f6940 raw: ffff88804c8ab800 ffff88804c8ab080 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804c8ab680: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804c8ab700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88804c8ab780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88804c8ab800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804c8ab880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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