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BUG: KASAN: use-after-free in class_equal+0x40/0x50 /kernel/locking/lockdep.c:1579
Read of size 8 at addr ffff8880968b3770 by task syz-executor.5/9462

CPU: 1 PID: 9462 Comm: syz-executor.5 Not tainted 5.2.0+ #66
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 ffff8880968b2d40
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 2608 bytes inside of
 4096-byte region [ffff8880968b2d40, ffff8880968b3d40)
The buggy address belongs to the page:
page:ffffea00025a2c80 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea000247e608 ffffea0002205008 ffff8880aa402000
raw: 0000000000000000 ffff8880968b2d40 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880968b3600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880968b3680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880968b3700: fb fb fb fb f1 f1 f1 f1 00 f2 f2 f2 fb fb fb fb
                                                             ^
 ffff8880968b3780: 00 00 00 f3 f3 f3 f3 f3 00 00 00 fb fb fb fb fb
 ffff8880968b3800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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