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List:       evms-devel
Subject:    Re: [Evms-devel] [MAILER-DAEMON@csh.rit.edu: Undelivered Mail Returned to
From:       Steve Dobbelstein <steved () us ! ibm ! com>
Date:       2003-10-22 14:34:10
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Matt Zimmerman wrote:
> evms-devel: I received this bug report from an EVMS user.  From a brief
scan
> of the log, it looks like the engine segfaulted after resizing the device
> and before resizing the filesystem.
>
> Ross: can you send the output from:
>
> dpkg -l '*evms*'
>
> and:
>
> ls -l /lib/evms
>
> to ensure that you have no plugins installed other than the ones included
> with EVMS itself?
>
> ----- Forwarded message from Ross Boylan <ross@biostat.ucsf.edu> -----
>
> Date: Thu, 16 Oct 2003 14:36:24 -0700
> From: Ross Boylan <ross@biostat.ucsf.edu>
> Resent-From: Ross Boylan <ross@biostat.ucsf.edu>
> To: Debian Bug Tracking System <submit@bugs.debian.org>
> Subject: Bug#216156: evms: Expand volume fails to grow underlying Reiser
FS (segfault)
>
> Package: evms
> Version: 2.1.1-3
> Severity: normal
>
> I attempted to expand a volume with Reiser FS from the evms-gui.  It
> appears that the underlying volume has been expanded, but the file
> system has not.  It was online at the time.  Since I suspect the
> problem is with the underlying evms libraries/engine, I am reporting
> this against evms; please reclassify if appropriate.  The engine log
> shows a segmentation fault.

Unfortunately, the Engine log doesn't provide any additional information
about where the segfault occurred.  If the problem is reproducible, then
run "evmsgui -d everything" to set the logging debug level to log
everything.  In the log from that run the log statements before the
segfault statements will give a clue as to what code was running when the
segfault occurred.  Often that is enough to track down the cause of the
segfault.

> I have a SCSI disk with a large segment dedicate to an evms container.
> This included a 4G region I wanted to expand to 6G; there was about
> 5.4G of freespace.  I selected the region and went through the
> expansion steps for the GUI specified in the EVMS User Guide,
> selection 2000 Mb expansion.  Then I hit save.  The interface then
> disappeared; I thought it was just closing after completion, but
> discovered later it crashed (see logs below).
>
> When I restarted emvs-gui, it showed the volume was 6.0G.  However, df
> shows the corresponding partition is 4.0G, and the GUI detailed info
> option shows the file system size if 4.0G.  Note that the manual says
>
> "G.4. Expanding ReiserFS file systems
>
> A ReiserFS file system is automatically expanded when its volume is
> expanded. ReiserFS file systems can be expanded if the volume is
> mounted or unmounted. "
>
> The file system (my /var) was online and mounted at the time I did
> this.
>
> There does not appear to have been any data loss, and my system
> continues to operate normally (well, except that /var has filled up,
> which is why I started this....).
>
> I recall that there are several versions of reiser tools for Debian;
> is it possible I have the wrong one?
>
> ii  libreiserfs0.3 0.3.0.4-1      ReiserFS filesystem access and
manipulation
> ii  reiserfsprogs  3.6.11-1       User-level tools for ReiserFS
filesystems
>
> Clearly, a more graceful failure would be good even if the tools are
wrong :)

Yes.  EVMS tries to handle errors when possible.  It's hard to recover
gracefully from a segfault.

> I would appreciate any guidance about how to proceed.  Though I seem
> OK now, I am reluctant to attempt further operations on the volume or
> its filesystem without knowing exactly what state it is in.

To expand a reiserfs file system, the reiserfs EVMS plug-in forks and execs
the command "resize_reiserfs /dev/evms/var".  You should be able to run
"resize_reiserfs /dev/evms/var" by hand to get the file system expanded to
the new size of the volume.

Steve D.



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