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BUG: KASAN: slab-out-of-bounds in class_equal+0x40/0x50 kernel/locking/lockdep.c:1527
Read of size 8 at addr ffff88807af61800 by task syz-executor.3/8695

CPU: 1 PID: 8695 Comm: syz-executor.3 Not tainted 5.2.0-rc6+ #41
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 2318326928:
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Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected to SLAB object 'skbuff_ext_cache' (offset 56, size 1)!
WARNING: CPU: 1 PID: 8695 at mm/usercopy.c:74 usercopy_warn+0xeb/0x110 mm/usercopy.c:74
Kernel panic - not syncing: panic_on_warn set ...
Kernel Offset: disabled