Interrupted livecd-creator leaves hung loopback mount

Hi,

I've been using the livecd-creator with FC7-t3 and am mostly pretty happy with the
results.  I have noticed one problem.  If I try to CTRL-C the livecd-creator during the
RPM-installation step (which for my current spin takes 10 minutes or so) I end up with a
hung /dev/loop0 mount that I cannot umount.  I find I have to reboot to clear the mount. 


I'm working on a customized application DVD with many custom RPMs -- this means that
frequently during the RPM installation phase of livecd-creator I see an issue I want to
address and I would rather not wait for it to finish so I would like to be able to CTRL-C
things right there.

Here's an example of what I see after an interrupted livecd-creator session and what I
try to do to clear it (I modified livecd-creator to use /repo/tmp rather than /var/tmp on
my machine but that's the only change):

[root@mca proc]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda8             5.9G  4.3G  1.5G  75% /
tmpfs                1007M     0 1007M   0% /dev/shm
/dev/sda7             4.9G  2.2G  2.8G  45% /images
/dev/sda9              25G  6.9G   18G  29% /repo
/dev/loop0            3.4G  1.3G  2.1G  39% /repo/tmp/livecd-creator-o_09S3/install_root

[root@mca proc]# umount /repo/tmp/livecd-creator-o_09S3/install_root
umount: /repo/tmp/livecd-creator-o_09S3/install_root: device is busy
umount: /repo/tmp/livecd-creator-o_09S3/install_root: device is busy

[root@mca proc]# lsof | grep /repo/tmp/livecd-creator-o_09S3/install_root

[root@mca proc]# lsof | grep loop0
loop0      3445      root  cwd       DIR        8,8     4096          2 /
loop0      3445      root  rtd       DIR        8,8     4096          2 /
loop0      3445      root  txt   unknown                                /proc/3445/exe

[root@mca proc]# ps auxww | grep 3445
root      3445  0.5  0.0      0     0 ?        S<   16:05   0:04 [loop0]
root      5140  0.0  0.0   4000   704 pts/0    R+   16:18   0:00 grep 3445

[root@mca proc]# 


I'd appreciate any help or insight into how I can either umount the /dev/loop0 mount
or more cleanly interrupt the livecd-creator.

Thanks!

-Andy Smith

[J. Hartline]

asmith11(a)cox.net wrote:
>  Hi,
>
>  I've been using the livecd-creator with FC7-t3 and am mostly pretty happy with the
> results.  I have noticed one problem.  If I try to CTRL-C the livecd-creator during the
> RPM-installation step (which for my current spin takes 10 minutes or so) I end up with a
> hung /dev/loop0 mount that I cannot umount.  I find I have to reboot to clear the mount. 
>
>
>
>
>
>  I'd appreciate any help or insight into how I can either umount the /dev/loop0 mount
> or more cleanly interrupt the livecd-creator.
>     
Ideally, you want to trap SIGINT which is sent using CTRL-C and cleanup.
livecd-creator to my knowledge is still under development, so this 
hasn't been implemented probably.

J. Hartline

[Jeroen van Meeuwen]

asmith11(a)cox.net wrote:
>  Hi,
>  
>  I've been using the livecd-creator with FC7-t3 and am mostly pretty happy with the
> results.  I have noticed one problem.  If I try to CTRL-C the livecd-creator during the
> RPM-installation step (which for my current spin takes 10 minutes or so) I end up with a
> hung /dev/loop0 mount that I cannot umount.  I find I have to reboot to clear the mount. 
>
>  
>  I'm working on a customized application DVD with many custom RPMs -- this means that
> frequently during the RPM installation phase of livecd-creator I see an issue I want to
> address and I would rather not wait for it to finish so I would like to be able to CTRL-C
> things right there.
>  
>  Here's an example of what I see after an interrupted livecd-creator session and what
> I try to do to clear it (I modified livecd-creator to use /repo/tmp rather than /var/tmp
> on my machine but that's the only change):
>   
You'ld actually want to remove the loop device mount with a little 
utility called 'losetup'. View it's man page to get the details.

Kind regards,

Jeroen van Meeuwen

[Elias Hunt]

Andy,

I hit the same problems while testing against T4. I don't remember if I
performed a lazy unmount first or dumped the loop device. But
effectively you need to clear the loop device to tidy things up.

losetup -d /dev/loop0

If that alone doesn't allow you to unmount, or that fails with a mount
issue, try running unmount with the "-l" flag for lazy unmount. That
clears the mount from the mount tables without waiting on processes.

-Eli

-----Original Message-----
From: fedora-livecd-list-bounces(a)redhat.com
[mailto:[e-mail]] On Behalf Of
asmith11(a)cox.net
Sent: Thursday, May 10, 2007 12:35 PM
To: fedora-livecd-list(a)redhat.com
Subject: [Fedora-livecd-list] Interrupted livecd-creator leaves
hungloopback mount

Hi,

I've been using the livecd-creator with FC7-t3 and am mostly pretty
happy with the results.  I have noticed one problem.  If I try to CTRL-C
the livecd-creator during the RPM-installation step (which for my
current spin takes 10 minutes or so) I end up with a hung /dev/loop0
mount that I cannot umount.  I find I have to reboot to clear the mount.


I'm working on a customized application DVD with many custom RPMs --
this means that frequently during the RPM installation phase of
livecd-creator I see an issue I want to address and I would rather not
wait for it to finish so I would like to be able to CTRL-C things right
there.

Here's an example of what I see after an interrupted livecd-creator
session and what I try to do to clear it (I modified livecd-creator to
use /repo/tmp rather than /var/tmp on my machine but that's the only
change):

[root@mca proc]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda8             5.9G  4.3G  1.5G  75% /
tmpfs                1007M     0 1007M   0% /dev/shm
/dev/sda7             4.9G  2.2G  2.8G  45% /images
/dev/sda9              25G  6.9G   18G  29% /repo
/dev/loop0            3.4G  1.3G  2.1G  39%
/repo/tmp/livecd-creator-o_09S3/install_root

[root@mca proc]# umount /repo/tmp/livecd-creator-o_09S3/install_root
umount: /repo/tmp/livecd-creator-o_09S3/install_root: device is busy
umount: /repo/tmp/livecd-creator-o_09S3/install_root: device is busy

[root@mca proc]# lsof | grep
/repo/tmp/livecd-creator-o_09S3/install_root

[root@mca proc]# lsof | grep loop0
loop0      3445      root  cwd       DIR        8,8     4096          2
/
loop0      3445      root  rtd       DIR        8,8     4096          2
/
loop0      3445      root  txt   unknown
/proc/3445/exe

[root@mca proc]# ps auxww | grep 3445
root      3445  0.5  0.0      0     0 ?        S<   16:05   0:04 [loop0]
root      5140  0.0  0.0   4000   704 pts/0    R+   16:18   0:00 grep
3445

[root@mca proc]# 


I'd appreciate any help or insight into how I can either umount the
/dev/loop0 mount or more cleanly interrupt the livecd-creator.

Thanks!

-Andy Smith

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