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From: John Garry <john.garry@huawei.com>
To: Ming Lei <ming.lei@redhat.com>
Cc: "axboe@kernel.dk" <axboe@kernel.dk>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	Christoph Hellwig <hch@infradead.org>
Subject: Re: [REPORT] BUG: KASAN: use-after-free in bt_iter+0x80/0xf8
Date: Wed, 19 Aug 2020 17:48:41 +0100	[thread overview]
Message-ID: <165cddcd-ad2c-7022-cae2-7995db39e570@huawei.com> (raw)
In-Reply-To: <20200819142147.GA2795390@T590>

On 19/08/2020 15:21, Ming Lei wrote:
> I guess that elevator switch may have to be involved in your reproducer, stale
> request which are freed before switching to new elevator can stay in tags->rqs[],
> then these stale requests are retrieved when reading iostat before old request slots in
> tags->rqs[] are reset.

Yeah, just switching -> "none" seems to do it. If I hack the elevator 
code to default to "none", then no issue.

Thanks

      reply	other threads:[~2020-08-19 16:51 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-18 12:03 [REPORT] BUG: KASAN: use-after-free in bt_iter+0x80/0xf8 John Garry
2020-08-18 18:19 ` John Garry
2020-08-19  0:00   ` Ming Lei
2020-08-19  7:43     ` John Garry
2020-08-19  8:58       ` Ming Lei
2020-08-19 10:14         ` John Garry
2020-08-19 14:21           ` Ming Lei
2020-08-19 16:48             ` John Garry [this message]

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