linux-kernel - Re: [Bug 9483] circular locking dependency detected

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: <20071204133515.83b26277.akpm@linux-foundation.org>
Date:	Tue, 4 Dec 2007 13:35:15 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	aneesh.kumar@...ux.vnet.ibm.com, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, bugme-daemon@...zilla.kernel.org
Subject: Re: [Bug 9483] circular locking dependency detected

On Tue, 4 Dec 2007 22:25:18 +0100
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com> wrote:
> 
> > =======================================================
> > [ INFO: possible circular locking dependency detected ]
> > 2.6.24-rc3 #6
> > -------------------------------------------------------
> > bash/2294 is trying to acquire lock:
> > (&journal->j_list_lock){--..}, at: [<c01eee2f>] journal_try_to_free_buffers+0x76/0x10c
> > 
> > but task is already holding lock:
> > (inode_lock){--..}, at: [<c01864b6>] drop_pagecache+0x48/0xd8
> > 
> > which lock already depends on the new lock.
> 
> Andrew, drop_pagecache() is root-only and it has some known deadlock, 
> right?
> 

yup.   It takes inode_lock at too high a level so it can walk the per-sb inode
lists.
--
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/