audit: type=1400 audit(2000000306.590:50969): avc:  denied  { map } for  pid=28921 comm="blkid" path="/lib/x86_64-linux-gnu/libblkid.so.1.1.0" dev="sda1" ino=2825 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(2000000306.590:50970): avc:  denied  { map } for  pid=28919 comm="blkid" path="/lib/x86_64-linux-gnu/libblkid.so.1.1.0" dev="sda1" ino=2825 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
==================================================================
BUG: KASAN: use-after-free in ext4_data_block_valid+0x279/0x2d0 fs/ext4/block_validity.c:211
Read of size 8 at addr ffff8881d5febbb0 by task modprobe/28944

CPU: 1 PID: 28944 Comm: modprobe Not tainted 4.14.94+ #10
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x10e lib/dump_stack.c:53
 print_address_description+0x60/0x226 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0x88/0x2a5 mm/kasan/report.c:393
audit: type=1400 audit(2000000306.590:50971): avc:  denied  { map } for  pid=28926 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(2000000306.590:50972): avc:  denied  { map } for  pid=28926 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
audit: type=1400 audit(2000000306.600:50973): avc:  denied  { map } for  pid=28925 comm="modprobe" path="/etc/ld.so.cache" dev="sda1" ino=2503 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
PF_BRIDGE: RTM_NEWNEIGH with unknown ifindex

Allocated by task 1:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc.part.0+0x4f/0xd0 mm/kasan/kasan.c:551
 slab_post_alloc_hook mm/slab.h:442 [inline]
 slab_alloc_node mm/slub.c:2723 [inline]
 slab_alloc mm/slub.c:2731 [inline]
 kmem_cache_alloc+0xd2/0x2d0 mm/slub.c:2736
 add_system_zone+0x29b/0x530 fs/ext4/block_validity.c:85
 ext4_setup_system_zone+0x2e2/0x470 fs/ext4/block_validity.c:169

Freed by task 28936:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xb0/0x190 mm/kasan/kasan.c:524
 slab_free_hook mm/slub.c:1389 [inline]
 slab_free_freelist_hook mm/slub.c:1410 [inline]
 slab_free mm/slub.c:2966 [inline]
 kmem_cache_free+0xc4/0x330 mm/slub.c:2988
 ext4_release_system_zone+0x68/0xe0 fs/ext4/block_validity.c:187
 ext4_setup_system_zone+0x3a3/0x470 fs/ext4/block_validity.c:151
 ext4_remount+0xf14/0x1d30 fs/ext4/super.c:5292
audit: type=1400 audit(2000000306.620:50974): avc:  denied  { map } for  pid=28919 comm="blkid" path="/lib/x86_64-linux-gnu/libc-2.13.so" dev="sda1" ino=2784 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
 do_remount_sb2+0x35a/0x5e0 fs/super.c:878
 do_remount fs/namespace.c:2388 [inline]
 do_mount+0x1305/0x26a0 fs/namespace.c:2894
 SYSC_mount fs/namespace.c:3119 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3096
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289

The buggy address belongs to the object at ffff8881d5febb98
 which belongs to the cache ext4_system_zone of size 40
The buggy address is located 24 bytes inside of
 40-byte region [ffff8881d5febb98, ffff8881d5febbc0)
The buggy address belongs to the page:
page:ffffea000757fac0 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000100(slab)
raw: 4000000000000100 0000000000000000 0000000000000000 0000000180490049
raw: dead000000000100 dead000000000200 ffff8881d9020200 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d5feba80: fb fb fb fb fb fc fc fb fb fb fb fb fc fc fb fb
EXT4-fs (sda1): re-mounted. Opts: noblock_validity,
 ffff8881d5febb00: fb fb fb fc fc fb fb fb fb fb fc fc fb fb fb fb
>ffff8881d5febb80: fb fc fc fb fb fb fb fb fc fc fc fc fc fc fc fc
                                     ^
 ffff8881d5febc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881d5febc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================