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

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Message-ID: <CAOLZvyGUBy_aezR32kUiwGSpT0CJhK9_b6_ApCi8GJwJAQNpQw@mail.gmail.com>
Date:	Mon, 11 Aug 2014 14:02:49 +0200
From:	Manuel Lauss <manuel.lauss@...il.com>
To:	David Rientjes <rientjes@...gle.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 1:49 PM, David Rientjes <rientjes@...gle.com> wrote:
> On Mon, 11 Aug 2014, 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.
>>
>
> Does enabling CONFIG_DEBUG_SPINLOCK fix the issue?

Yes it does indeed.


Manuel
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