linux-ext4 - Re: resize2fs stuck in ext4_group_extend with 100% CPU Utilization With Small Volumes

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: <5601E71C.4080705@redhat.com>
Date:	Tue, 22 Sep 2015 18:41:16 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	"Pocas, Jamie" <Jamie.Pocas@....com>,
	"Theodore Ts'o" <tytso@....edu>
Cc:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: resize2fs stuck in ext4_group_extend with 100% CPU Utilization
 With Small Volumes

On 9/22/15 4:26 PM, Pocas, Jamie wrote:
> Hi Theodore,
> 
> I am not sure if you had a chance to see my reply to Eric yet. I can
> see you are using the same general approach that Eric was using. The
> key difference from what I am doing again seems to be that I am
> resizing the underlying disk *while the filesystem is mounted*.

Do you see the same problem if you resize a physical disk, not
just with loopback? Sounds like it...

In theory it should be reproducible w/ lvm too, then, I think,
unless there's some issue specific to your block device similar to
what's happening on the loop device.

> Instead you both are using truncate to grow the disk while the
> filesystem is not currently mounted, and then mounting it.

Always worth communicating a testcase in the first email, if you
have one, so we don't have to guess.  ;)

thanks,
-Eric

--
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