linux-kernel - [BUG] Possible silent data corruption in filesystems/page cache

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Date:	Wed, 1 Jun 2016 09:51:46 +0000
From:	"Barczak, Mariusz" <mariusz.barczak@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"Wysoczanski, Michal" <michal.wysoczanski@...el.com>,
	"Baldyga, Robert" <robert.baldyga@...el.com>,
	"Barczak, Mariusz" <mariusz.barczak@...el.com>,
	"Roman, Agnieszka" <agnieszka.roman@...el.com>
Subject: [BUG] Possible silent data corruption in filesystems/page cache

Hi

We run data validation test for buffered workload on filesystems:
ext3, ext4, and XFS.
In context of flushing page cache block device driver returned IO error.
After dropping page cache our validation tool reported data corruption.

We provided a simple patch in order to inject IO error in device mapper.
We run test to verify md5sum of file during IO error.
Test shows checksum mismatch.

Attachments:
0001-drivers-md-dm-add-error-injection.patch - device mapper patch
dm-test.txt - validation test script

Regards,
Mariusz Barczak
Intel Technology Poland

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