==================================================================
BUG: KASAN: use-after-free in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff888079517b10 by task syz-executor.5/10096

CPU: 1 PID: 10096 Comm: syz-executor.5 Not tainted 5.2.0-rc5+ #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

The buggy address belongs to the page:
page:ffffea0001e545c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x1fffc0000000000()
raw: 01fffc0000000000 ffffea0001e545c8 ffffea0001e545c8 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888079517a00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888079517a80: ff ff ff ff f1 f1 f1 f1 00 f2 f2 f2 00 f2 f2 f2
>ffff888079517b00: ff ff ff ff 00 00 00 f3 f3 f3 f3 f3 ff ff ff ff
                         ^
 ffff888079517b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888079517c00: ff ff ff 00 00 00 00 00 00 00 00 ff ff ff ff ff
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Kernel panic - not syncing: panic_on_warn set ...
Kernel Offset: disabled