linux-kernel - Re: [PATCH] freezer: configure user space process frozen along with kernel threads

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]

Date:	Wed, 20 Feb 2013 10:24:12 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
cc:	Li Fei <fei.li@...el.com>, <pavel@....cz>, <rjw@...k.pl>,
	<len.brown@...el.com>, <mingo@...hat.com>, <peterz@...radead.org>,
	<akpm@...ux-foundation.org>, <viro@...iv.linux.org.uk>,
	<gorcunov@...nvz.org>, <rientjes@...gle.com>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<chuansheng.liu@...el.com>, <biao.wang@...el.com>
Subject: Re: [PATCH] freezer: configure user space process frozen along with
 kernel threads

On Wed, 20 Feb 2013, Eric W. Biederman wrote:

> Why can't the fuse filesystem freeze when there are requests pending?

It _can_ freeze (that is, the fuse daemon can).  The problem is that
tasks _using_ the fuse filsystem can't if the daemon doesn't respond.  
These tasks are stuck in uninterruptible wait states deep in the
filesystem layer, probably holding important locks.  They can't be
frozen until the outstanding requests complete.

Alan Stern

--
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/