linux-kernel - Re: BUG: KASAN: slab-use-after-free in reweight

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Date:   Sat, 21 Oct 2023 17:02:13 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: BUG: KASAN: slab-use-after-free in reweight_entity+0x8d4


* Mikhail Gavrilov <mikhail.v.gavrilov@...il.com> wrote:

> Hi,
> I caught one slab-use-after-free durung release cycle 6.6 rc6 and it
> looks like it will not easily reproduce again.
> I tried rebooting and repeating all my actions but slab-use-after-free
> did not happen again.
> 
> What we know:
> 
> 1) backtrace:
> 
> [  336.215839] BUG: KASAN: slab-use-after-free in reweight_entity+0x8d4/0xa50
> [  336.215846] Read of size 8 at addr ffff88812d1a80b0 by task
> fossilize_repla/10552

I think it might be the bug fixed via:

  d2929762cc3f ("sched/eevdf: Fix heap corruption more")

Thanks,

	Ingo