[Bug 422138] Re: Slow memory leak, seen on two machines, appears to be dupe of 224945 even after -updates

[Joe McDonagh]

Hey Chuck, thanks for the response. The command is:

ab -n 2000000 -c 100 -f TLS11 https://webserver/

At ten seconds:

30253 www-data  20   0  254m  75m 4432 S   31  0.5   0:03.50 apache2            
30252 www-data  20   0  251m  72m 4464 S   30  0.4   0:03.34 apache2            
30250 www-data  20   0  250m  70m 4420 S   29  0.4   0:03.26 apache2            
30251 www-data  20   0  250m  70m 4448 S   29  0.4   0:03.28 apache2            
30249 www-data  20   0  249m  70m 4444 S   28  0.4   0:03.20 apache2            
30331 www-data  20   0  244m  65m 4404 R   30  0.4   0:02.96 apache2            
30369 www-data  20   0  233m  53m 4432 R   24  0.3   0:02.36 apache2            
30410 www-data  20   0  231m  51m 4348 S   22  0.3   0:02.18 apache2            
30458 www-data  20   0  224m  45m 4372 S   19  0.3   0:01.86 apache2            
30506 www-data  20   0  217m  38m 4324 R   15  0.2   0:01.50 apache2            
30557 www-data  20   0  212m  32m 4356 R   12  0.2   0:01.20 apache2            
30620 www-data  20   0  207m  27m 4356 S    9  0.2   0:00.92 apache2            

This is a significant jump in memory allocation, and children get
spawned. I expect the children per my configuration, but the memory use
is obscene. At three minutes (stopped ab at this point)

30253 www-data  20   0  366m 187m 4636 S    3  1.2   0:09.52 apache2            
30252 www-data  20   0  364m 185m 4656 S    3  1.2   0:09.46 apache2            
30251 www-data  20   0  363m 184m 4668 S    3  1.1   0:09.40 apache2            
30250 www-data  20   0  361m 182m 4632 S    3  1.1   0:09.30 apache2            
30249 www-data  20   0  359m 179m 4676 S    3  1.1   0:09.14 apache2            
30331 www-data  20   0  355m 176m 4668 S    3  1.1   0:08.94 apache2            
30369 www-data  20   0  343m 164m 4636 S    3  1.0   0:08.34 apache2            
30410 www-data  20   0  343m 163m 4628 S    3  1.0   0:08.26 apache2            
30458 www-data  20   0  337m 158m 4684 S    3  1.0   0:07.96 apache2            
30557 www-data  20   0  320m 141m 4608 R    3  0.9   0:07.08 apache2            
30620 www-data  20   0  320m 140m 4676 S    3  0.9   0:07.06 apache2            
30675 www-data  20   0  315m 135m 4620 S    3  0.8   0:06.74 apache2            
30731 www-data  20   0  311m 131m 4624 S    3  0.8   0:06.54 apache2            
30841 www-data  20   0  300m 121m 4656 S    3  0.8   0:05.96 apache2            
30901 www-data  20   0  295m 116m 4608 S    3  0.7   0:05.70 apache2            
30957 www-data  20   0  294m 114m 4624 S    3  0.7   0:05.62 apache2            

Now ab is not running, but my stopwatch program is. Now at 5 minutes:

30458 www-data  20   0  341m 162m 4692 S    0  1.0   0:08.16 apache2            
31126 www-data  20   0  290m 111m 4596 S    0  0.7   0:05.42 apache2            
31112 www-data  20   0  288m 109m 4604 S    0  0.7   0:05.30 apache2            
31210 www-data  20   0  287m 108m 4612 S    0  0.7   0:05.24 apache2            
31257 www-data  20   0  287m 107m 4600 S    0  0.7   0:05.24 apache2            
31222 www-data  20   0  286m 107m 4636 S    0  0.7   0:05.20 apache2            
31410 www-data  20   0  285m 105m 4588 S    0  0.7   0:05.10 apache2            
31412 www-data  20   0  284m 105m 4656 S    0  0.7   0:05.12 apache2            
31396 www-data  20   0  284m 105m 4632 S    0  0.7   0:05.12 apache2            

Note that although some threads do disappear (normal, expect) the ones
that stay never free up any RAM. If I were to let this just chill by
itself for a few days, res would be a gig or so and virt would be up
there.

And for good measure, ten minutes:

30458 www-data  20   0  341m 162m 4692 S    0  1.0   0:08.22 apache2            
31126 www-data  20   0  291m 111m 4604 S    0  0.7   0:05.48 apache2            
31112 www-data  20   0  290m 110m 4620 S    0  0.7   0:05.42 apache2            
31222 www-data  20   0  288m 109m 4652 S    0  0.7   0:05.34 apache2            
31210 www-data  20   0  288m 109m 4616 S    0  0.7   0:05.36 apache2            
31257 www-data  20   0  287m 108m 4604 S    0  0.7   0:05.30 apache2            
31410 www-data  20   0  286m 107m 4604 S    0  0.7   0:05.22 apache2            
31396 www-data  20   0  286m 106m 4636 S    0  0.7   0:05.24 apache2            
31384 www-data  20   0  286m 106m 4616 S    0  0.7   0:05.22 apache2            
31412 www-data  20   0  285m 106m 4660 S    0  0.7   0:05.18 apache2 

The server isn't being used much right now, but as you can see, no
memory has really been free'd. Right now I am working around this by
reloading apache at 11:59 every night (the saddest cron job on earth),
which appears to bring memory usage back down.

-- 
Slow memory leak, seen on two machines, appears to be dupe of 224945 even after -updates
https://bugs.launchpad.net/bugs/422138
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