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BUG: KASAN: slab-out-of-bounds in usage_accumulate+0x9e/0xb0 kernel/locking/lockdep.c:1676
Read of size 8 at addr ffff8880a59cfed0 by task syz-executor.1/9366

CPU: 1 PID: 9366 Comm: syz-executor.1 Not tainted 5.2.0-rc3+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 0:
(stack is not available)

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8880a59ce6c0
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 2064 bytes to the right of
 4096-byte region [ffff8880a59ce6c0, ffff8880a59cf6c0)
The buggy address belongs to the page:
page:ffffea0002967380 refcount:1 mapcount:0 mapping:ffff8880aa400dc0 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea000296a008 ffffea000233fe08 ffff8880aa400dc0
raw: 0000000000000000 ffff8880a59ce6c0 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a59cfd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a59cfe00: fc fc fc fc f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2
>ffff8880a59cfe80: 00 f2 f2 f2 00 f2 f2 f2 fc fc fc fc 00 00 00 f2
                                                 ^
 ffff8880a59cff00: f2 f2 f2 f2 fc fc fc fc 00 00 00 f3 f3 f3 f3 f3
 ffff8880a59cff80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
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