[stunnel-users] possible stunnel memory leak

[Stefano Stabellini]

Hi all,
I may have found a possible memory leak in stunnel (version 4.15) when 
used with pthreads.
What I am seeing is the memory usage going up when connections open and 
never going down, no matter if all the connections close.
It is really easy to reproduce it: I have started two stunnel instances 
communicating with each other, the first one acting as a server (config 
file stunnel.1) and executing cat, the second one acting as a client 
(config file stunnel.2) and opening port 5556.
Then I execute the script I have attached that simply opens 500 
connections using netcat to port 5556.
If you cat /proc/<stunnel pid>/status you can see that the memory usage 
is about 300MB.
The problem is that even after all the connections are closed the memory 
usage stays (more or less) the same.
I tried to find the bug myself using valgrind, but I couldn't get far, 
it seems that valgrind gets confused by openssl so doesn't print very 
useful informations.
I really appreciate any help you can give me; just tell me if you need 
any other info.
Best Regards,

Stefano Stabellini
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