loop3: p3 start 201 is beyond EOD, truncated
loop3: p4 start 301 is beyond EOD, [  190.006434] ==================================================================
BUG: KASAN: use-after-free in ext4_data_block_valid+0x290/0x2e0 fs/ext4/block_validity.c:210
Read of size 8 at addr ffff8801cdbf8590 by task jbd2/sda1-8/1925

CPU: 1 PID: 1925 Comm: jbd2/sda1-8 Not tainted 4.9.124-g09eb2ba #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cdbdf208
 ffffffff81eb95e9 ffffea000736fe00 ffff8801cdbf8590 0000000000000000
 ffff8801cdbf8590 0000000000030777 ffff8801cdbdf240 ffffffff8156c35e
 ffff8801cdbf8590 0000000000000008 0000000000000000Call Trace:
 [<ffffffff81eb95e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb95e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8156c35e>] print_address_description+0x6c/0x234 mm/kasan/report.c:256
 [<ffffffff8156c768>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff8156c768>] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412
 [<ffffffff8153faf4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 [<ffffffff81835cb0>] ext4_data_block_valid+0x290/0x2e0 fs/ext4/block_validity.c:210
 [<ffffffff817443f1>] __check_block_validity.constprop.86+0xc1/0x200 fs/ext4/inode.c:378
 [<ffffffff81748187>] ext4_map_blocks+0xc87/0x16d0 fs/ext4/inode.c:568
 [<ffffffff81748dba>] _ext4_get_block+0x1ea/0x510 fs/ext4/inode.c:763
 [<ffffffff81749112>] ext4_get_block+0x32/0x40 fs/ext4/inode.c:777
 [<ffffffff816251a7>] generic_block_bmap+0x107/0x180 fs/buffer.c:2990
 [<ffffffff8173eb16>] ext4_bmap+0x196/0x3e0 fs/ext4/inode.c:3226
 [<ffffffff815cef23>] bmap+0x93/0xc0 fs/inode.c:1563
 [<ffffffff818b0737>] jbd2_journal_bmap+0x57/0xf0 fs/jbd2/journal.c:797
 [<ffffffff818b08b5>] jbd2_journal_next_log_block+0xe5/0x160 fs/jbd2/journal.c:780
 [<ffffffff818b09c2>] jbd2_journal_get_descriptor_buffer+0x92/0x370 fs/jbd2/journal.c:832
 [<ffffffff818927ca>] journal_submit_commit_record+0x11a/0xab0 fs/jbd2/commit.c:134
 [<ffffffff818972b8>] jbd2_journal_commit_transaction+0x4158/0x6050 fs/jbd2/commit.c:869
 [<ffffffff818a932a>] kjournald2+0x22a/0x830 fs/jbd2/journal.c:224
 [<ffffffff8119f3cd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff83a01b9c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Allocated by task 1:
 save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57
 save_stack+0x43/0xd0 mm/kasan/kasan.c:505
 set_track mm/kasan/kasan.c:517 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:609
 kasan_slab_alloc+0x12/0x20 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+0xbe/0x290 mm/slub.c:2728
 add_system_zone+0x284/0x5d0 fs/ext4/block_validity.c:84
 ext4_setup_system_zone+0x27a/0x490 fs/ext4/block_validity.c:159
 ext4_fill_super+0x6a6d/0xb490 fs/ext4/super.c:4178
 mount_bdev+0x2c7/0x390 fs/super.c:1100
 ext4_mount+0x34/0x40 fs/ext4/super.c:5608
 mount_fs+0x28c/0x370 fs/super.c:1206
 vfs_kern_mount.part.29+0xd1/0x3d0 fs/namespace.c:1000
 vfs_kern_mount fs/namespace.c:982 [inline]
 do_new_mount fs/namespace.c:2537 [inline]
 do_mount+0x3c9/0x2740 fs/namespace.c:2859
 SYSC_mount fs/namespace.c:3075 [inline]
 SyS_mount+0xfe/0x110 fs/namespace.c:3052
 do_mount_root init/do_mounts.c:366 [inline]
 mount_block_root+0x35d/0x711 init/do_mounts.c:396
 mount_root+0x77/0x7a init/do_mounts.c:541
 prepare_namespace+0x1d8/0x215 init/do_mounts.c:601
 kernel_init_freeable+0x50f/0x52d init/main.c:1036
 kernel_init+0x11/0x15e init/main.c:946
 ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Freed by task 12606:
(stack is not available)

The buggy address belongs to the object at ffff8801cdbf8578
 which belongs to the cache ext4_system_zone of size 40
The buggy address is located 24 bytes inside of
 40-byte region [ffff8801cdbf8578, ffff8801cdbf85a0)
The buggy address belongs to the page:
page:ffffea000736fe00 count:1 mapcount:0 mapping:          (null) index:0xffff8801cdbf8b60
flags: 0x8000000000000080(slab)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801cdbf8480: fb fc fc fb fb fb fb fb fc fc fb fb fb fb fb fc
 ffff8801cdbf8500: fc fb fb fb fb fb fc fc fb fb fb fb fb fc fc fb
>ffff8801cdbf8580: fb fb fb fb fc fc fb fb fb fb fb fc fc fb fb fb
                         ^
 ffff8801cdbf8600: fb fb fc fc fb fb fb fb fb fc fc fb fb fb fb fb
 ffff8801cdbf8680: fc fc fb fb fb fb fb fc fc fb fb fb fb fb fc fc
==================================================================