Reproduction instructions, using the binary itself.
# Extract syslogd from the Precise netboot:
wget 
http://archive.ubuntu.com/ubuntu/dists/precise/main/installer-amd64/current/images/netboot/netboot.tar.gz
tar xzf /home/mwharris/Downloads/netboot.tar.gz 
./ubuntu-installer/amd64/initrd.gz
mkdir sbin
gzip -dc ubuntu-installer/amd64/initrd.gz | cpio -i sbin/syslogd

# Run the new syslogd.
sudo stop rsyslog # to free the port
sudo ./sbin/syslogd -n

# Now the busybox syslogd is running.
# Send a long line to syslogd
logger "watch runs command repeatedly, displaying its output and errors (the 
first screenfull).  This allows you to watch the program output change over 
time.  By default, the program is run every 2 seconds; use -n or --interval to 
specify a different interval. Normally, this interval is interpreted as the 
amout of time between the completion of one run of command and the beginning of 
the next run. However, with the -p or --precise option, you can make watch 
attempt to run command every interval seconds. Try it with ntptime and notice 
how the fractional seconds stays (nearly) the same, as opposed to normal mode 
where they continuously increase."

Check /var/log/messages for truncated output.

Another option to reproduce would be to look for a long line generated
during install time, but I don't know of one off-hand. We're running
puppet during install and it generates some long lines when it errors.

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https://bugs.launchpad.net/bugs/1040900

Title:
  syslog messages truncated to 256 chars during debian-installer run

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