On a low-powered VPS I maintain, which also functions as a production server, I keep an eye on logs to crisis-manage should a site get an influx of traffic or something goes haywire (tail a bunch of log files, top, iostat etc). This is infrequent, but can happen.
There's half a dozen WordPress installs (all up to date), with a few custom plugins (all up to date) and cached & optimised for quick pageloads.
I've noticed that in
/var/log/messages there's dozens, nay, hundreds of entries similar to the following:
httpd: <ul></ul> Feb 25 09:48:19 node1 httpd: <ul></ul> Feb 25 09:51:54 node1 last message repeated 8 times Feb 25 09:56:23 node1 last message repeated 40 times Feb 25 10:11:49 node1 last message repeated 40 times
with nothing further provided. This isn't a new problem, but I couldn't pin down when exactly it started happening.
Obviously Apache's generating the error, and it smells to me like a PHP error, but before I go squirreling around turning various high-level logging on and enabling debug modes on this production VM, has anybody else come across this problem and knows the root cause(s)?