Memory leak when Archive Download fails #1235
Description
Version
6.2.64
Installation method
My own rpm, derived from official source RPM. Redhat Enterprise Server 7.
Expected behavior
wwsympa.pl should not leak 4 GBytes of memory when an archive download fails.
Actual behavior
(Output from Linux top command):
16817 sympa 20 0 4916564 4.2g 6612 S 0.0 26.8 4:30.05 wwsympa.fcgi
4.2g is 4.2 Gytes of Residient Set Size. That starts as about 200 MBytes.
Additional Information
One of my list owners attempted to download a 1.3 GBytes ZIP archive of their mail archives (about 3 to 4 GBytes of raw data).
Apache timed out after (I think) 60 seconds: it is possible I need to increase the Apache default timeout. That left the wwsympa.fcgi process in question using 4.2 GBytes RSS, which does not appear to be returned to the system.
The list owner then repeated the process multiple times until all of the wwsympa processes were 4.2 GBytes in size.
I think that there might also be slow memory leaks in other Sympa daemons, but this largely explains why a virtual machine with 16 GBytes RAM was swapping like mad this morning until I restarted wwsympa. It normally only uses about 6 GBytes, with the rest spare/as buffer cache. OOM killer had stepped in, which is never a good sign on Linux.
I don't think that this memory leak happens if the download is successful. However I think that I will disable list archive downloads for the time being...