PGError: server closed the connection unexpectedly

Hi,
Since 1-2 weeks I get a lot of "PGError: server closed the connection
unexpectedly" errors and I cant figure out where it is coming from.
Haven't found any solution on Google either.

My setup is:
Postgres
Rails 2.3.9
Passenger
Ruby 1.9.2

Thought it might be passenger, so I stopped the spawning, it seems to
have helped a bit, but I still get these errors.
The errors are from random queries, so can't really limit it to a
controller or model either.

any ideas appreciated

Could you set your log level to debug and send us the error message
+backtrace?. The log entries would help.

Exequiel wrote in post #1018244:

Could you set your log level to debug and send us the error message
+backtrace?. The log entries would help.

Attached one of the traces I get from exception mailer

Attachments:
http://www.ruby-forum.com/attachment/6546/stack_trace.txt

Is the postgres server running on the same machine? or is a remote
server?. It could be a timing out problem. OR, are you using a fork
method in some place, maybe the app is missing the db connection. I
think I had same error message some time ago and if I remember well I
updated the pg-ruby binding and it worked.

Exequiel wrote in post #1018312:

Is the postgres server running on the same machine? or is a remote
server?. It could be a timing out problem. OR, are you using a fork
method in some place, maybe the app is missing the db connection. I
think I had same error message some time ago and if I remember well I
updated the pg-ruby binding and it worked.

I read about the forking problem, but I am using a plain rails stack, so
not forking anything really.

will try to up/downgrade the pg gem.

I was getting these errors too, in my case it turned out to be the ssl connection to postgresql (on a local to local connection). Seems it uses ssl by default, and there is an issue with long running ssl connections.

Simple solution for me was to turn off SSL on the connection, as it was a local connection and going going over the internet.

I read your post somewhere and already tried to turn ssl off. My db is
on the same server currently.
I will turned it off in Postgres explicitly and will add the yml flag to
database.yml as another try.

Jim Morris wrote in post #1018382:

Nothing seems to help.
Turned off ssl and added it to database.yml
Stopped passenger spawning
Downgraded pg gem to 0.10.1.

Still get the random errors....

Well my setup is different, I use rails 3+, I’ve used pg 0.10 and now pg 0.11, posgresql 8.4, ruby 1.8.7 and the current passenger.

I found the problem now. It was actually nothing related to either
Ruby/Rails or Postgres, but to Ubuntu.

Wouldn't have thought that, but it seems there was a big bug with the
glibc library that caused the Postgres connections to crash.

postgres[8194]: segfault at 0 ip b6eb5e11 sp bfb3e41c error 4 in
libc-2.11.1.so[b6e40000+157000]

looked much too late into /var/log/messages to see the error. Seems to
have been a common error on Ubuntu 10.04 LTS!! Lot of people are
affected by it in various applications.

An upgrade to a later kernel release seems to have fixed the problem.
already thought I have to switch to another release.

hope this helps people having the same problem