linux-kernel - Re: MIPS: hang in kmalloc with seccomp writer locks

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Message-ID: <20140811151153.GA14365@roeck-us.net>
Date:	Mon, 11 Aug 2014 08:11:53 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Manuel Lauss <manuel.lauss@...il.com>
Cc:	Kees Cook <keescook@...omium.org>,
	Linux-MIPS <linux-mips@...ux-mips.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: MIPS: hang in kmalloc with seccomp writer locks

On Mon, Aug 11, 2014 at 01:35:28PM +0200, Manuel Lauss wrote:
> Hi Kees,
> 
> My MIPS32 toys hang early during bootup at the first kmalloc() with
> seccomp enabled.
> I've bisected it to commit dbd952127d11bb44a4ea30b08cc60531b6a23d71
> ("seccomp: introduce writer locking").  And indeed, reverting this
> commit fixes the hang.
> 
> I'm not sure if seccomp is even working on MIPS, but I've never had
> problems with
> it before so I thought I let you know.
> 

Also see [1] and [2], the latter providing a patch to fix the problem.
The problem is only seen in unicore systems with lock debugging disabled.

Guenter

---
[1] https://lkml.org/lkml/2014/8/9/163
[2] https://lkml.org/lkml/2014/8/10/184
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