mksquashfs hangs

Bug #222700 reported by Dr Paul Brewer on 2008-04-26
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Ubuntu Customization Kit
squashfs (Debian)
Fix Released
squashfs (Ubuntu)

Bug Description

Binary package hint: squashfs-tools

What I expected to happen:
mksquashfs should build a compressed filesystem

What happened instead:
mksquashfs hangs

Potential Fix, Untested:
Debian bugs reports a similar problem with mksquashfs hanging while building a compressed filesystem; there may exist a patch in CVS for squashfs on sourceforge that is not in the officially released distribution on sourceforge.

I routinely use mksquashfs as part of a procedure to build a customized compressed filesystem.
No special parameters are input to mksquashfs, as part of this process, so this potentially affects all builders.
Whereas on ubuntu 7.10 and a single processor system, I had no problem with mksquashfs; on a multiprocessor system under ubuntu 8 it hangs.

Command that hangs:
# mksquashfs . $TMPCDCOPY/casper/filesystem.squashfs
(run as root; $TMPCDCOPY points to a valid location; process completes to 96% before hanging)

Package version:
# dpkg-query --list | grep squashfs
ii squashfs-tools 1:3.3-1ubuntu2

Arch: intel 64 bit

lsb_release -rd
Description: Ubuntu 8.04
Release: 8.04

Possible solution:
Debian bugs reports a similar problem; there may exist a patch in CVS for squashfs on sourceforge that is not in the released file on sourceforge.
I thought perhaps the ubuntu mksquashfs could suffer from the same problem and maybe does not include the code in CVS
 as mentioned with debian.

A patch is mentioned at
cut/paste of this message follows. (However, I have not tried applying the patch he mentions)

>Message #10 received at <email address hidden> (full text, mbox):
>From: Stefan Lippers-Hollmann <email address hidden>
>To: <email address hidden>
>Subject: upstream CVS fixes the regression in squashfs-tools 1:3.3-1
>Date: Tue, 11 Dec 2007 02:30:54 +0100
>[Message part 1 (text/plain, inline)]
>tags 455589 + patch
>Looking through the recent revision history for mksquashfs.c in the
>upstream CVS, changeset 1.47 of /squashfs/squashfs-tools/mksquashfs.c:
>caught my eyes. Applying it to 1:3.3-1 succeeds and fixes the previously
>mentioned regression in mksquashfs:

tm-o (tm-o) wrote :

This is probably the same bug that is mentioned in squashfs mailing list. You can identify this by trying to use mksquashfs with "-no-sparse" option. This bug seems to be fixed in the latest CVS-version of suashfs-tools. This all was mentioned in squashfs mailing list:

I confirm this report. Mine hangs at 49% and I have tried 5 times

ii squashfs-tools 1:3.3-1ubuntu2
Running Ubuntu 8.04 i386

macada (macadanet) wrote :

A workaround is download the debian package of the squasfs-tools: The requirements for this packages are supported in the 8.04 ubuntu.
I hope this helps.

Changed in uck:
importance: Undecided → Low
status: New → Confirmed
Paul Sladen (sladen) on 2008-06-22
Changed in uck:
status: Confirmed → Invalid
Changed in squashfs:
status: New → Confirmed
Changed in squashfs:
status: Unknown → Fix Released
gutocarvalho (gutocarvalho) wrote :

I confirm this report.

The package from debian works fine.

I'm still waiting the fix in ubuntu package.


sanych (ssanych) wrote :

I confirm this report too.
Debian package worked.

Miguel Rodríguez (migrax) wrote :

I confirm that -no-sparse switch fixes the problem for me

Please, update update the hardy version. I always encounter this problem when I update LTSP images.

GerryG (kanab2004) wrote :

As of Ubuntu Hardy 2-6-24-24, the problem remains. the --no--sparse let it go further, but it still hung. Replaced with the debian package as noted above and all works fine.

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