I've recently setup a couple of new servers. This time I'm encrypting most of my partitions using dmcrypt+LUKS. However these new servers crash very often, every few days. Full lockups, kernel does not respond to keyboard, system does not ping. According to Munin graphs and atop records, there has been no increase in resource usage. There are no relevant log records in the local syslog logs. There are no relevant records on our remote log host (which the new servers forward syslog to). There are no relevant netconsole messages (the new servers forward all kernel messages using netconsole to a log host). The kernel didn't even print anything to the TTY. I asked the hosting company to perform a full hardware test, and they found nothing. I'm suspecting LUKS. Does anybody else also experience full lock ups with LUKS? The only reference I could find is http://ubuntuforums.org/showthread.php?t=2125287.
I had similar problems when trying to set up an Arch and Debian system on a dmcrypt+LUKS partition. The issue always surfaced while secure-erasing the LUKS partition using the
Point 4.3 on the cryptsetup FAQ page describes how faulty memory can cause drastic corruption while writing to encrypted devices, and related symptoms like freezing and lock-ups, which lead me to suspect a faulty memory.
Just for reference I am listing some of the posts/discussions describing similar issues I went through while searching for hints and solution: