[stunnel-users] possible stunnel memory leak

Tue Mar 25 16:40:06 CET 2008

Michał Trojnara wrote:
> Stefano Stabellini wrote:
>> I may have found a possible memory leak in stunnel
>> (version 4.15) when used with pthreads.
> 
> Please test it with latest stunnel and the OpenSSL library.
> I'd rather expect the leak to be within the OpenSSL library.
> Stunnel is very conservative about its dynamic memory allocation.
> 

The situation is different with stunnel 4.21, the peak is lower (about 
100M instead of 300M) but after closing all the connections the memory 
usage is still about 50M:

VmPeak:    97036 kB
VmSize:    92652 kB
VmLck:         0 kB
VmHWM:     51444 kB
VmRSS:     46992 kB
VmData:    89192 kB
VmStk:        88 kB
VmExe:        84 kB
VmLib:      3124 kB
VmPTE:       104 kB

in any case a big improvement, but probably there is still an issue 
somewhere.
I think that it has something to do with deallocating resources when a 
thread dies, but it is just a guess.