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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 ffff88809356ca20 by task syz-executor.3/9103

CPU: 1 PID: 9103 Comm: syz-executor.3 Not tainted 5.2.0-rc2+ #43
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 2333972768:
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Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected to SLAB object 'task_struct' (offset 792, size 1)!
WARNING: CPU: 1 PID: 9103 at mm/usercopy.c:78 usercopy_warn+0xeb/0x110 mm/usercopy.c:78
Kernel panic - not syncing: panic_on_warn set ...
Kernel Offset: disabled