Bug#887873: linux-image-4.9.0-5-marvell: frequent "usercopy: kernel memory overwrite attempt detected" on QNAP NAS (ARM)

To: Menno Finlay-Smits <inbox@menno.io>
Cc: Yves-Alexis Perez <corsac@debian.org>, 887873@bugs.debian.org, Martin Michlmayr <tbm@cyrius.com>, Gregory Clement <gregory.clement@free-electrons.com>, linux-arm-kernel@lists.infradead.org
Subject: Bug#887873: linux-image-4.9.0-5-marvell: frequent "usercopy: kernel memory overwrite attempt detected" on QNAP NAS (ARM)
From: Andrew Lunn <andrew@lunn.ch>
Date: Wed, 7 Mar 2018 14:36:11 +0100
Message-id: <[🔎] 20180307133611.GC18030@lunn.ch>
Reply-to: Andrew Lunn <andrew@lunn.ch>, 887873@bugs.debian.org
In-reply-to: <[🔎] 1520395120.2285859.1294250416.5E5FC747@webmail.messagingengine.com>
References: <151652931598.757.4527606947579667082.reportbug@massive.lan> <[🔎] 20180304174157.ajom7whbo7pr3qb4@jirafa.cyrius.com> <[🔎] 20180304204115.GD21710@lunn.ch> <151652931598.757.4527606947579667082.reportbug@massive.lan> <[🔎] 20180305142846.GJ25189@lunn.ch> <[🔎] 1520265474.2408.8.camel@debian.org> <[🔎] 1520297697.4117371.1292731088.7BEDFAAE@webmail.messagingengine.com> <[🔎] 1520395120.2285859.1294250416.5E5FC747@webmail.messagingengine.com> <151652931598.757.4527606947579667082.reportbug@massive.lan>

> What else can I try?

Do you have transparent huge pages enabled?

~$ cat /sys/kernel/mm/transparent_hugepage/enabled 
[always] madvise never

If so, could you disable it with:

echo never > /sys/kernel/mm/transparent_hugepage/enabled

and run your rsync command.

Thanks
	Andrew

Reply to:

Follow-Ups:
- Bug#887873: linux-image-4.9.0-5-marvell: frequent "usercopy: kernel memory overwrite attempt detected" on QNAP NAS (ARM)
  - From: "Menno Finlay-Smits" <inbox@menno.io>

References:
- Bug#887873: linux-image-4.9.0-5-marvell: frequent "usercopy: kernel memory overwrite attempt detected" on QNAP NAS (ARM)
  - From: Martin Michlmayr <tbm@cyrius.com>
- Bug#887873: linux-image-4.9.0-5-marvell: frequent "usercopy: kernel memory overwrite attempt detected" on QNAP NAS (ARM)
  - From: Andrew Lunn <andrew@lunn.ch>
- Bug#887873: linux-image-4.9.0-5-marvell: frequent "usercopy: kernel memory overwrite attempt detected" on QNAP NAS (ARM)
  - From: Andrew Lunn <andrew@lunn.ch>
- Bug#887873: linux-image-4.9.0-5-marvell: frequent "usercopy: kernel memory overwrite attempt detected" on QNAP NAS (ARM)
  - From: Yves-Alexis Perez <corsac@debian.org>
- Bug#887873: linux-image-4.9.0-5-marvell: frequent "usercopy: kernel memory overwrite attempt detected" on QNAP NAS (ARM)
  - From: "Menno Finlay-Smits" <inbox@menno.io>
- Bug#887873: linux-image-4.9.0-5-marvell: frequent "usercopy: kernel memory overwrite attempt detected" on QNAP NAS (ARM)
  - From: "Menno Finlay-Smits" <inbox@menno.io>

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