linux-ext4 - Re: ext4: 3.17? problems

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: <20140930231801.GB729@khazad-dum.debian.net>
Date:	Tue, 30 Sep 2014 20:18:01 -0300
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	Pavel Machek <pavel@....cz>
Cc:	Theodore Ts'o <tytso@....edu>,
	kernel list <linux-kernel@...r.kernel.org>, jack@...e.cz,
	linux-ext4@...r.kernel.org, adilger.kernel@...ger.ca,
	Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: Re: ext4: 3.17? problems

On Tue, 30 Sep 2014, Pavel Machek wrote:
> > > So I had to hard power-down the machine. That should be perfectly
> > > safe, as ext4 has a journal, and this is plain SATA disk, right?
> >   Yes, it should be safe.
> 
> Good.

...

> Is there some phase during shutdown where journalling no longer
> protects fs integrity?

Hmm... what kind of backing device?  Because I have Crucial/Micron M500 SSDs
here that _always_ complain (in a SMART counter/attribute) that they have
been subject to a sudden poweroff *when subject to a normal system
shutdown*.

This is scaring me a great deal.  Are we doing something different for SSDs
in the scsi-sd or libata shutdown paths?

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html