lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1186518208.11797.176.camel@lappy>
Date:	Tue, 07 Aug 2007 22:23:28 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Paul Menage <menage@...gle.com>
Cc:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.com,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	ckrm-tech@...ts.sourceforge.net
Subject: Re: [ckrm-tech] Circular Locking Dependency Chain detected in
	containers code

On Tue, 2007-08-07 at 13:10 -0700, Paul Menage wrote:
> I'm away from work at the moment and can't investigate fully, but it
> looks as though this may be the same one that I mentioned in the
> introductory email to the patchset. If so, it's a false positive -
> there's a point in the container mount code where we need to lock a
> newly-created (and hence guaranteed unlocked) directory inode while
> holding container mutex. This makes the lockdep code think that
> inode->i_mutex nests inside container_mutex, when in fact
> container_mutex nests outside inode->i_mutex in all cases except this
> one case where i_mutex can't possibly be locked.
> 
> I've not learned enough about lockdep yet to figure out how to shut it
> up in this case.

The typical annotation would be using spin_lock_nested/mutex_lock_nested
with a non-0 nesting level for this one case.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ