[hunchentoot-devel] Strange race condition?

[John Thingstad]

I have just written a blog program.
Functionally it is complete, but it contains a big and serious flaw.
At intermittent intervals it gives a error like:

[2007-08-18 09:05:58 [ERROR]] While accessing database  
#<CLSQL-MYSQL:MYSQL-DATAB
ASE localhost/blog/jthing OPEN 219A8C6F>
   with expression "SELECT * FROM BLOG_ITEMS WHERE (ID = 224)":
   Error 2006 / MySQL server has gone away
   has occurred.

It seems like a clsql error.. So why am I reporting it to here?

Well the first thing to do is to isolate what is causing the error.
After eliminating that the error was in my code (which included a rewrite)  
I found it down to the following lines:

     (with-html-output-to-string
         (*standard-output* nil :prologue t :indent t)
       (:html :xmlns "http://www.w3.org/1999/xhtml"
        (:head
         (:title (fmt "~A - ~A"
                      (escape-string (getf blog :title))
                      (escape-string (getf item :title))))
         (:link :href *blog-css-file*
          :rel "stylesheet" :type "text/css")
         (:link :href *tree-css-file*
          :rel "stylesheet" :type "text/css"
          :media "screen, projection")
         (:script :type "text/javascript" :src *tree-js-file* "")
         (:script :type "text/javascript"
          (fmt "~%addLoadListener( function() { treeMenu('~A', '~A'); });"
               "navigation"
               (format nil "~A?id=~D"
                       (script-name)
                       item-id))))

So it should be reported to cl-who right. Wrong!
The problem isn't in the code that is generated.
It appers to be the fact that I am including 2 css files and a javascript  
file.
It is the UPLOAD of these from the client and the inerruption of the  
thread that causes the problem.
Has anyone here experienced anything simular?