[maemo-users] Troubles with chrooted Debian

[From: Pavel Řezníček]

2012/1/2 Michael Rösch <maemo at dobiwe.de>

> Am 02.01.2012 12:01, schrieb Pavel Řezníček:
> > My dear Maemo friends,
> >
> > On my N900, I use the /Debian chrooted system/ but I /very often run
> > into troubles/ with it.
> >
> > To read quickly, go after the words /in italics/ ;-)
> >
> > I just need to compile the /Lazarus Free Pascal IDE/ for my device
> > and/or to /develop applications with it./
> > Sometimes it happened when I had Debian in an image file that /my N900
> > suddenly crashed and switched off/ during the installation of some
> > packages into Debian. So I ran fsck, expecting some damage to the
> > filesystem in that image file. But the corruption appeared so heavy that
> > it was /basically unrepairable./
> > This happenened /very frequently/ so I started to keep a backup of the
> > standard 2GiB image. Still, the loss of work was /very annoying…/ it’s a
> > bit time consuming to backup 2GiB of data after each single step, don’t
> > you think so?
> > OK, I thought it was better to use a physical device, an MMC SD card. So
> > /I’ve formatted an 8GB card to ext3/ and /copied/ all the contents of
> > the Debian image onto it using rsync.
> > I’ve then modified the /home/user/.chroot configuration script
> accordingly.
> > All has worked fine except that during installation of the compiled
> > Lazarus (make install) /a copy command has frozen for all the night./
> > That was strange, so I pressed /Ctrl+C with no effect./ I tried to
> > /Close Debian./ /It has also hung./ So I’ve turned my device off.
> > OK, the first run of fsck on /dev/mmcblk1p1 has just /recovered the ext3
> > filesystem journal./
> > I’ve been curious then if there were some errors left there, so I’ve run
> > /fsck -f /dev/mmcblk1p1. Ouch! A destruction of the fs again!/
> >
> > *The side question:*
> > /Is it a good idea to check an ext3 filesystem right after a journal
> > recovery? Or should I first mount it?/ I’m apparently lacking an
> > essential knowledge here.
>
> I think fsck before mounting is never a bad idea. When the fs is damaged
> the mount can make things even worse.
>
> > *The main question:*
> > /Is it possible to avoid severe filesystem damage/ during just normal
> > but io-intensive operations /on the Debian for armel on the N900?/
> >
>
> I am using my debian on an ext2-Partition for over a year now on two
> three different cards- never had any problems like you.
> I also use another ext3-Partition on the same card for data, the same
> here: no problems.
>
> Have you ever considered your sd-card may be broken or simply not
> suitable for the n900?
> Do you have the possibility to try another one?
> I using a Patriot 32Gb Class 10 now, before it was a Transcend 16 GB
> Class 6.
>
> CU Michael
> --
> BOMBING for peace is like FUCKING for virginity.
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>

Dear Michael,

thank you for your kind response!

I'm glad to know that running fsck before mounting is never a bad idea [?]

OK, *the SD-card may really be broken,* that's right. I have to go for one
and buy it (or via an e-shop) as soon as I have the time. Or, I may *test
this old one for bad blocks.*
*
*
But *what was then wrong with my Debian when run from an image file* on the
internal memory storage (/home/user/MyDocs/debian-m5-v3e.img.ext2)?

As I mentioned before, during the installation process of some more
packages, my N900 just went off regularly. Did you any time try to *upgrade
your whole Debian system* ("sudo apt-get update; sudo apt-get upgrade"
without specifying a package)? This is what I actually tried a couple of
times but always ended up in a switch-off in random stages of the package
installation, resulting in a severe filesystem damage inside the Debian
image file…

The case with the installation of the Lazarus IDE on the SD-card and on an
ext3 formatted partition might be related but also unrelated.

So the next step is to check the card for physically bad blocks. I'll give
it a try and report the results [?]
-- 
Pavel Řezníček
software developer and computer network administrator
vývojář a správce počítačových sítí
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