In fact, seeing that in your log makes me strongly suspect that the original reporter has been bitten by the same bug - and that /var/tmp or /var/log is actually being delayed until another mount has finished which never does.
Can't 100% verify since the original reporter hasn't provided the requested information (or even his /etc/fstab) - but I feel pretty confident that this is fixed in lucid since I can now replicate a similar problem, and can explain why this would only affect tmpfs
In fact, seeing that in your log makes me strongly suspect that the original reporter has been bitten by the same bug - and that /var/tmp or /var/log is actually being delayed until another mount has finished which never does.
Can't 100% verify since the original reporter hasn't provided the requested information (or even his /etc/fstab) - but I feel pretty confident that this is fixed in lucid since I can now replicate a similar problem, and can explain why this would only affect tmpfs