==================================================================
BUG: KASAN: use-after-free in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff88809946f8c0 by task syz-executor.4/8763

CPU: 1 PID: 8763 Comm: syz-executor.4 Not tainted 5.2.0-rc2+ #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

The buggy address belongs to the page:
page:ffffea0002651bc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x1fffc0000000000()
raw: 01fffc0000000000 0000000000000000 ffffffff02650101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809946f780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88809946f800: ff ff ff ff ff ff ff ff ff ff f1 f1 f1 f1 00 f2
>ffff88809946f880: f2 f2 00 f2 f2 f2 ff ff ff ff 00 00 00 f3 f3 f3
                                           ^
 ffff88809946f900: f3 f3 ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88809946f980: ff ff ff ff ff ff ff ff ff 00 00 00 00 00 00 00
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
Kernel Offset: disabled