[rt-users] Problem after an upgrade to 3.8.1

[Sebastien Termeau]

Dear RT-Users,

I have a really recent RT 3.6.7 installation (around 200 tickets)
running on CentOS 5.2.
I was able to upgrade to 3.8.0 without problems.
The problems appear when I tried to upgrade either from 3.6.7 to 3.8.1
or from 3.8.0 to 3.8.1. A fresh 3.8.1 installation works fine.
After the upgrade,  when I try to access the web interface I only
receive a blank page.
In my apache error log file, the following message is present:
   Out of memory!
   Callback called exit.
I got the same error when I tried to use "rt-clean-sessions".
Using 'perl -d', I tracked down the error to
RT::Interface::Web::Session::ClearByUser line 246
  eval { tie %session, $class, $id, $attrs };
     -> $class=Apache::Session::MySQL
     -> $id=3d97a1c2c09740acfee006d0221d1d12
     -> attrs is an empty hash

I tried to remove all the existing sessions in the database : delete
from sessions;
And it was working fine for 5 minutes. Then the same error rise again.

Did I missed something in the upgrade process?
Do you have a suggestion?

Regards