linux-kernel - netpoll again ? (was: Re: 2.6.20-git14 rtl8139 possible 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: <20070217225746.GB16954@electric-eye.fr.zoreil.com>
Date:	Sat, 17 Feb 2007 23:57:46 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: netpoll again ? (was: Re: 2.6.20-git14 rtl8139 possible circular locking dependency detected)

Francois Romieu <romieu@...zoreil.com> :
> Michal Piotrowski <michal.k.k.piotrowski@...il.com> :
> [...]
> 
> Did you enable RTL8139_DEBUG ?
> 
> If so you can try the patch below.

It's buggy there too but you are not experiencing this one.

1 - netpoll() calls the poll() handler of the device through netpoll_poll()
2 - The poll handler of the device tries to acquire dev->_xmit_lock
    through dev_mc_add during the Rx protocol processing
3 - netpoll() holds dev->_xmit_lock to avoid recursion in netpoll_poll()

#2 and #3 have opposite requirements.

-- 
Ueimor
-
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/