KASAN: use-after-free Write in check_noncircular

[Tetsuo Handa]

This is not a TOMOYO's bug. But

On 2019/07/17 17:58, syzbot wrote:
> ==================================================================
> BUG: KASAN: use-after-free in check_noncircular+0x91/0x560 kernel/locking/lockdep.c:1722
> Write of size 56 at addr ffff888089815160 by task syz-executor.4/8772
> 
> CPU: 1 PID: 8772 Comm: syz-executor.4 Not tainted 5.2.0+ #31
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
> 

what happened here? No trace was printed to console output?

> Allocated by task 8457: