ubuntu-syncdaemon produces "disk wait CPU" death and filesystem crash

[Nemo_bis]

In the last few days, soon after reboot ubuntu-syncdaemon, if not killed immediately, soon keeps the disk so busy that all the CPU goes to "wait CPU" and the system basically dies; after a while, the filesystem is made read-only (due to errors created by the hectic situation, I suppose), which is sometimes fixed by the disk checks on reboot and sometimes not (needing some fsck work).
I'm quite sure that ubuntu-syncdaemon is to blame because 1) if I disable sync the situation never reappears, 2) if I kill it immediately after reboot or when CPU wait begins to peak the system doesn't "crash", 3) if I don't do (1) nor (2) it's consistently reproduced.
It's not possible to run apport when the FS is read-only nor when the CPU is basically unavailable, hence what attached is taken before the actual problem begins.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: ubuntuone-client 2.0.1-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.0.0-22.36-generic-pae 3.0.33
Uname: Linux 3.0.0-22-generic-pae i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Tue Jul 10 18:58:45 2012
ExecutablePath: /usr/lib/ubuntuone-client/ubuntuone-syncdaemon
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
SourcePackage: ubuntuone-client
UbuntuOneSyncdaemonExceptionsLog:

UbuntuOneUserSyncdaemonConfig:
 [__main__]
 files_sync_enabled = True
 log_level = DEBUG
UpgradeStatus: Upgraded to oneiric on 2011-10-27 (257 days ago)

[Nemo_bis (nemobis)]

Might be the same as bug 946565.

[Alejandro J. Cura (alecu)]

Hi Nemo_bis, would you mind telling more about your issue?

Did you find hardware errors on your disk? Perhaps you can get more info by looking at the "SMART Data" for your device in the "Disk Utility" application (it's called "palimpsest" from the command line).

[Nemo_bis (nemobis)]

I did have some errors but not severe ones it seems; I don't notice any when Ubuntu One is disabled. The drive passes tests.

[Launchpad Janitor (janitor)]

[Expired for ubuntuone-client (Ubuntu) because there has been no activity for 60 days.]