Solved. As expected, this issue had nothing to do with Linode or the Linux kernel/distribution. More information, although this will be useless for the majority of people: http://www.facepunch.com/showpost.php?p=22575850&postcount=407

Hi,

I run a Garry's Mod dedicated server using the officially built beta Linux binaries. I'm posting here as has been suggested that it's some kind of kernel issue.

I apologise in advance about the vagueness of this post and the fact that I'm posting about something still in beta; however other people on the thread they were released on do not seem to be experiencing any kind of said stability problems.

The server keeps dying about once an hour with "Segmentation Fault", and spewing an entirely unhelpful debug.log: http://pastebin.com/raw.php?i=L4P3x7JM

Along with a load of messages dumped in /var/log/messages referencing the kernel (last few lines of said file): http://pastebin.com/raw.php?i=Lk5CpCUS

I'm running Ubuntu 9.10 x64 bit. Are there any other form of logs that linux keeps about crashed software that I can try and decipher? Does the included /var/log/messages point to something specific?

It has also been suggested that the Xen virtualization could be affecting the software in some way - could this be the case?

Thank you, but I realize this is seemingly impossible to diagnose from the little information I've got.