EXT4-fs (sda1): Remounting file system with no journal so ignoring journalled data option ================================================================== BUG: KASAN: use-after-free in ext4_data_block_valid+0x28d/0x2e0 fs/ext4/block_validity.c:210 Read of size 8 at addr ffff8801d531cbb0 by task syz-executor3/2116 CPU: 0 PID: 2116 Comm: syz-executor3 Not tainted 4.9.148+ #1 ffff8801a8c073e8 ffffffff81b44d01 0000000000000000 ffffea000754c700 ffff8801d531cbb0 0000000000000008 ffffffff817bbe2d ffff8801a8c07420 ffffffff815020d5 0000000000000000 ffff8801d531cbb0 ffff8801d531cbb0 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [] print_address_description+0x6f/0x238 mm/kasan/report.c:256 [] kasan_report_error mm/kasan/report.c:355 [inline] [] kasan_report mm/kasan/report.c:412 [inline] [] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:397 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 [] ext4_data_block_valid+0x28d/0x2e0 fs/ext4/block_validity.c:210 [] __check_block_validity.constprop.0+0xc1/0x210 fs/ext4/inode.c:378 [] ext4_map_blocks+0xdb7/0x1710 fs/ext4/inode.c:568 [] ext4_getblk+0x307/0x490 fs/ext4/inode.c:943 [] ext4_find_entry+0xa43/0x12b0 fs/ext4/namei.c:1420 [] ext4_lookup fs/ext4/namei.c:1559 [inline] [] ext4_lookup+0x139/0x5e0 fs/ext4/namei.c:1545 [] lookup_slow+0x24b/0x480 fs/namei.c:1709 [] mountpoint_last fs/namei.c:2698 [inline] [] path_mountpoint+0x376/0x6d0 fs/namei.c:2738 [] filename_mountpoint+0x17f/0x350 fs/namei.c:2758 [] user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2788 [] SYSC_umount fs/namespace.c:1722 [inline] [] SyS_umount+0x136/0xd30 fs/namespace.c:1706 [] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Allocated by task 1: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack mm/kasan/kasan.c:505 [inline] set_track mm/kasan/kasan.c:517 [inline] kasan_kmalloc.part.0+0x62/0xf0 mm/kasan/kasan.c:609 kasan_kmalloc+0xb7/0xd0 mm/kasan/kasan.c:594 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:547 slab_post_alloc_hook mm/slab.h:417 [inline] slab_alloc_node mm/slub.c:2715 [inline] slab_alloc mm/slub.c:2723 [inline] kmem_cache_alloc+0xd5/0x2b0 mm/slub.c:2728 add_system_zone+0x2a4/0x540 fs/ext4/block_validity.c:84 ext4_setup_system_zone+0x303/0x480 fs/ext4/block_validity.c:168 ext4_fill_super+0x6c62/0xb7a0 fs/ext4/super.c:4180 mount_bdev+0x2b8/0x360 fs/super.c:1100 ext4_mount+0x35/0x40 fs/ext4/super.c:5613 mount_fs+0x27c/0x380 fs/super.c:1206 vfs_kern_mount.part.0+0xcd/0x4c0 fs/namespace.c:1000 vfs_kern_mount fs/namespace.c:982 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c4/0x2970 fs/namespace.c:2871 SYSC_mount fs/namespace.c:3087 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3064 do_mount_root init/do_mounts.c:366 [inline] mount_block_root+0x304/0x6bd init/do_mounts.c:396 mount_root+0x77/0x7a init/do_mounts.c:541 prepare_namespace+0x1de/0x21d init/do_mounts.c:601 kernel_init_freeable+0x3a5/0x3c3 init/main.c:1036 kernel_init+0x12/0x163 init/main.c:946 ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Freed by task 4787: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack mm/kasan/kasan.c:505 [inline] set_track mm/kasan/kasan.c:517 [inline] kasan_slab_free+0xb0/0x190 mm/kasan/kasan.c:582 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kmem_cache_free+0xbe/0x310 mm/slub.c:2980 ext4_release_system_zone+0x6f/0xf0 fs/ext4/block_validity.c:186 ext4_setup_system_zone+0x3c3/0x480 fs/ext4/block_validity.c:150 ext4_remount+0x7b8/0x1c50 fs/ext4/super.c:5105 do_remount_sb2+0x340/0x7a0 fs/super.c:825 do_remount fs/namespace.c:2364 [inline] do_mount+0x1368/0x2970 fs/namespace.c:2862 SYSC_mount fs/namespace.c:3087 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3064 do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285 entry_SYSCALL_64_after_swapgs+0x5d/0xdb The buggy address belongs to the object at ffff8801d531cb98 which belongs to the cache ext4_system_zone of size 40 The buggy address is located 24 bytes inside of 40-byte region [ffff8801d531cb98, ffff8801d531cbc0) The buggy address belongs to the page: page:ffffea000754c700 count:1 mapcount:0 mapping: (null) index:0x0 flags: 0x4000000000000080(slab) page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d531ca80: fb fb fb fb fb fc fc fb fb fb fb fb fc fc fb fb ffff8801d531cb00: fb fb fb fc fc fb fb fb fb fb fc fc fb fb fb fb >ffff8801d531cb80: fb fc fc fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8801d531cc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801d531cc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================