VB 3.0.x crashes when creating loop file

[romarin12]

Hi All,

Virtual Box (3.0.8 & 3.0.10 , Vistax64 host) crashes every time I launch the code below as root on a Fedora11x64 guest. This code works on a 'real' Fedora11 box, and is meant to create a file system image (via a loop file) to be used as a customized Amazon EC2 AMI. The crashes occurs after about 5 mins, half way through the rpm downloads. The VM simply stops and Vista tries and fails (hangs) to send a crash report. The previous Virtual Box version (2.2) worked fine.

Thanks for all the good work,

Olivier.

#!/bin/sh

ver=11
arch=x86_64
loop=loop_F11x64

# clear stuff
umount -d /mnt/$loop/proc
umount -d /mnt/$loop
rm -fR /mnt/$loop
rm -f fc$ver-$arch.img

# create file system image 
dd if=/dev/zero of=fc$ver-$arch.img bs=1M count=1 seek=9500
/sbin/mke2fs -F -j fc$ver-$arch.img

# mount image as loop file
mkdir /mnt/$loop
mount -o loop fc$ver-$arch.img /mnt/$loop

# create some basic directories
mkdir /mnt/$loop/dev
mkdir /mnt/$loop/proc
mkdir /mnt/$loop/etc
for i in console null zero ; do /sbin/MAKEDEV -d /mnt/$loop/dev -x $i ; done

# create basic fstab
cat <<EOL > /mnt/$loop/etc/fstab
/dev/sda1  /         ext3    defaults        1 1
/dev/sdb   /mnt      ext3    defaults        0 0
none       /dev/pts  devpts  gid=5,mode=620  0 0
none       /dev/shm  tmpfs   defaults        0 0
none       /proc     proc    defaults        0 0
none       /sys      sysfs   defaults        0 0
EOL

# create proc dir
mkdir /mnt/$loop/proc
mount -t proc none /mnt/$loop/proc

# create local yum conf file for Fedora
cat <<EOL > ./yumec2.conf
[main]
cachedir=/var/cache/yum
debuglevel=2
logfile=/var/log/yum.log
exclude=*-debuginfo
gpgcheck=0
obsoletes=1
reposdir=/dev/null

[base]
name=Fedora Core $ver - $arch - Base
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=fedora-$ver&arch=$arch
enabled=1

[updates-released]
name=Fedora Core $ver - $arch - Released Updates
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=updates-released-f$ver&arch=$arch
enabled=1
EOL

# install base packages into image
yum -c ./yumec2.conf --installroot=/mnt/$loop -y groupinstall Base
yum -c ./yumec2.conf --installroot=/mnt/$loop -y clean packages

# cleaning
mv /mnt/$loop/lib/tls /mnt/$loop/lib/tls-disabled
mv /mnt/$loop/lib64/tls /mnt/$loop/lib64/tls-disabled

# flush file system buffers
sync

# unmount
umount -d /mnt/$loop/proc
umount -d /mnt/$loop 

[romarin12]

screen capture

[romarin12]

VB log

[romarin12]

Correction: Vista finally sends its crash report after 10 mins.

[Sander van Leeuwen]

This is reproducable?

[Frank Mehnert]

Are you running that script on a shared folder, that is, is the current directory a shared folder when you run this script?

[romarin12]

Hi Frank; I am running this script on a subfolder of /root . NOT a shared folder.

[romarin12]

Hi sandervl73 ; This is reproducible on this VirtualBox/Vistax64. I am currently setting-up VB and a clean Fedora11 guest onto another Vista host(32bits), in order to check for reproducibility in another environment.

[romarin12]

clean install - screen capture

[romarin12]

On the Vista 64bit host I have, after removing and re-installing VB 3.0.10, I experience the same crash with a clean ('out-of-the-box') Fedora 11 x64 guest. See screen capture:
​http://www.virtualbox.org/attachment/ticket/5384/VB-crash-shot-cleaninstall.PNG

I cannot reproduce this on the Vista 32bit host I have.

[codeslingercompsalot]

the assumption here is that this is somehow to do with the loop file.... But if I understand this correctly, you are doing major *network downloads* of files that you are saving to the loop disk. and you are crashing half-way through the download.

I wonder if this is actually a network bug instead??? there seems to be several problems with networking - for instance see bug #3318. Can you reproduce this crash by saving the downloaded files to a local directory instead?

[romarin12]

Thanks for following-up of this!

Unfortunately, I cannot reproduce this bug any more, as I don't work with MS Windows any more...

Anyway, I have just tested again the above code: it now works fine on a Fedora14x64 host/virtual machine running VB4.0.4

Please note that when I originally posted this bug, it did not occur on a Vista 32 bit host, but only on a Vista 64 bit, so this is not in favor of the network bug option.

[Frank Mehnert]

So let's close this ticket. Reopen if necessary.