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BUG: KASAN: use-after-free in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff8880a9194930 by task syz-executor.2/10035

CPU: 0 PID: 10035 Comm: syz-executor.2 Not tainted 5.2.0-rc3+ #15
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 ffff8880a9194900
 which belongs to the cache cred_jar of size 184
The buggy address is located 48 bytes inside of
 184-byte region [ffff8880a9194900, ffff8880a91949b8)
The buggy address belongs to the page:
page:ffffea0002a46500 refcount:1 mapcount:0 mapping:ffff8880aa587900 index:0xffff8880a9194f00
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea00024383c8 ffffea00028e6948 ffff8880aa587900
raw: ffff8880a9194f00 ffff8880a9194000 000000010000000d 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a9194800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a9194880: fb fb fb fb fb fb fb fc f1 f1 f1 f1 00 f2 f2 f2
>ffff8880a9194900: 00 f2 f2 f2 fb fb fb fb 00 00 00 f3 f3 f3 f3 f3
                                     ^
 ffff8880a9194980: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc
 ffff8880a9194a00: fb fb fb fb fb fb fb 00 00 00 00 00 00 00 00 fb
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