linux-kernel - Re: cred_guard_mutex vs seq_file::lock [was: Re: 3.14.0+/x86: lockdep and mutexes not getting along]

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Message-ID: <26259.1397227827@warthog.procyon.org.uk>
Date:	Fri, 11 Apr 2014 15:50:27 +0100
From:	David Howells <dhowells@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	dhowells@...hat.com, "Kirill A. Shutemov" <kirill@...temov.name>,
	"Michael L. Semon" <mlsemon35@...il.com>,
	Ingo Molnar <mingo@...nel.org>, jason.low2@...com,
	linux-kernel@...r.kernel.org, viro@...IV.linux.org.uk
Subject: Re: cred_guard_mutex vs seq_file::lock [was: Re: 3.14.0+/x86: lockdep and mutexes not getting along]

Peter Zijlstra <peterz@...radead.org> wrote:

> Al, David, any bright ideas on how to best fix this?

Have the seq_xxx() code throw an error if current->in_execve is true.  I can't
think of any circumstance where execve() should be reading anything that uses
seq_xxx().

David
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