Re: https server - memory leaks

[Dan Winship <danw gnome org>]

On 12/03/2013 10:50 AM, Bernhard Schuster wrote:
> I am running a decent HTTP server which fulfills just one specific task.
> I trimed (almost - setup stuff) all memory leaks so far, except for one.
>
> Massif/Valgrind tell me that it is part of libgiognutls.so/libgnutls.so
> (g_memdup -> g_bytes_new). I had a very brief look at the code but could
> not spot anything suspicous in gtls{server,}connection.[ch] - but as
> said I only had a very brief look.
>
> Also when I just do a few requests and set breakpoints on g_bytes_new
> and g_bytes_unref their count is equal, and g_memdup occurs by far too
> frequently to set breakpoints on.

This looks like the session cache; it's not actually leaking, it's just 
keeping a bit of information about each recent connection that allows 
those clients to do a simplified (ie, faster) TLS handshake the next 
time they connect.

Currently it only evicts cache entries when they're more than an hour 
old, so if you get lots of connections from lots of different clients, 
the cache might get pretty large... maybe the expiration time should be 
shorter. Or adjustable...

-- Dan