linux-kernel - Re: [fs] bdd20132c6: BUG: sleeping function called from invalid context at fs/proc/proc

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Date:	Sat, 23 Jul 2016 06:44:55 -0500
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	kernel test robot <xiaolong.ye@...el.com>
Cc:	lkp@...org, containers@...ts.linux-foundation.org,
	LKML <linux-kernel@...r.kernel.org>,
	Seth Forshee <seth.forshee@...onical.com>
Subject: Re: [fs]  bdd20132c6: BUG: sleeping function called from invalid context at fs/proc/proc_sysctl.c:1569

kernel test robot <xiaolong.ye@...el.com> writes:

> FYI, we noticed the following commit:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git for-testing
> commit bdd20132c624a976f88b108ff37c7481c6f33e70 ("fs: Set s_user_ns to &init_user_ns in sget when MS_KERNMOUNT")
>
> in testcase: boot
>
> on test machine: 2 threads qemu-system-x86_64 -enable-kvm with 360M memory
>
> caused below changes:

Thank you for the report.  For anyone who is watching the change that
actually has the problem is:

a02420f1402ca76a6f2833c14fa82044cb2a0ae4 ("userns: Add per user namespace sysctls.")

It looks like that change isn't ready.  Close but not quite.  Ah well.

Eric