linux-kernel - BUG in tty_open when using containers and ptrace

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Message-ID: <d06d0dd6a4ddf760bea53291c048e291@[::1]>
Date:	Sun, 12 Apr 2009 15:45:51 +0200
From:	Môshe van der Sterre <me@...he.nl>
To:	containers@...ts.osdl.org, lxc-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: BUG in tty_open when using containers and ptrace

Hello,

I am working on the lxc userspace tools, and got this BUG a couple of
times.
Here are the reports:

http://moshe.nl/tty-bugshot1.png
http://moshe.nl/tty-bugshot2.png

I am running 2.6.29.1 from kernel.org in a virtual machine under kvm.
I have not been able to reliably reproduce it, but it happens only after
the container is setup and ptrace is active on lxc-start.
I think the first screen shot is while all ttys where allowed in
cgroup.devices, the second one while only tty1 was allowed.

Greetings,
Môshe van der Sterre
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