Date:	Sun, 5 Oct 2008 11:15:26 +0200
From:	Quentin Godfroy <godfroy@...pper.ens.fr>
To:	Theodore Tso <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: possible (ext4 related?) memory leak in kernel 2.6.26

On Thu, Oct 02, 2008 at 08:35:48PM -0400, Theodore Tso wrote:
> On Wed, Oct 01, 2008 at 12:23:58AM +0200, Quentin wrote:
> > 
> > Of course. However since I unmounted and remounted /home the 'buffer' line
> > is now only 59megs, and they are still not dropped when a program tries to
> > malloc all the memory. I'll tell next time the problem shows up (it
> > can take ten days)
> > 
> 
> Are you willing to patch and recompile your kernel?  If so, the
> following patch would be very helpful in determining what is going on.
> It allows us to see what buffer heads are in use for a particular
> block device.  Attached please the kernel patch and the user program.

Now that the machine is again in the 100M+ in buffers (still unreleased when
a program asks for all the memory), I launched the program on the devices
which support / and /home.

I also attached /proc/meminfo and /proc/slabinfo

In both cases it freezes solid the machine for more than a minute or so, and
it overflows the dmesg with messages. Here is shown what I got

[166632.382632] buffer dirty: block 35491 count 1
[166632.386827] buffer dirty: block 35493 count 3
[166632.391019] buffer dirty: block 35494 count 1
[166632.395251] buffer dirty: block 35496 count 1
[166632.399446] buffer dirty: block 35497 count 2
[166632.403644] buffer dirty: block 35498 count 3
[166632.407979] buffer dirty: block 35499 count 1
[166632.412221] buffer dirty: block 35501 count 2
[166632.416464] buffer dirty: block 35502 count 1
[166632.420726] buffer dirty: block 35503 count 1
[166632.424962] buffer dirty: block 35504 count 3
[166632.429169] buffer dirty: block 35505 count 1
[166632.433410] buffer dirty: block 35506 count 1
[166632.437580] buffer dirty: block 35507 count 3
[166632.441787] buffer dirty: block 35508 count 1
[166632.446056] buffer dirty: block 35509 count 2
[166632.450333] buffer dirty: block 35510 count 2
[166632.454579] buffer dirty: block 35512 count 1
[166632.458791] buffer dirty: block 35513 count 1
[166632.462964] buffer dirty: block 35514 count 2
[166632.467136] buffer dirty: block 35515 count 1
[166632.471309] buffer dirty: block 35517 count 1
[166632.475482] buffer dirty: block 35518 count 2
[166632.479651] buffer dirty: block 35519 count 2
[166632.483933] buffer dirty: block 35522 count 1
[166632.488066] buffer dirty: block 35523 count 1
[166632.492162] buffer dirty: block 35524 count 1
[166632.496258] buffer dirty: block 35525 count 4
[166632.500350] buffer dirty: block 35527 count 1
[166632.504476] buffer dirty: block 35528 count 2
[166632.508607] buffer dirty: block 35529 count 3
[166632.512736] buffer dirty: block 35533 count 3
[166632.516831] buffer dirty: block 35536 count 1
[166632.520973] buffer dirty: block 35537 count 3
[166632.525138] buffer dirty: block 35538 count 1
[166632.529267] buffer dirty: block 35539 count 3
[166632.533398] buffer dirty: block 35541 count 1
[166632.537526] buffer dirty: block 35542 count 2
[166632.541653] buffer dirty: block 35543 count 1
[166632.545820] buffer dirty: block 35544 count 1
[166632.549949] buffer dirty: block 35545 count 2
[166632.554048] buffer dirty: block 35547 count 3
[166632.558216] buffer dirty: block 35548 count 2
[166632.562388] buffer dirty: block 35549 count 1
[166632.566521] buffer dirty: block 35550 count 1
[166632.570624] buffer dirty: block 35552 count 1
[166632.574755] buffer dirty: block 35553 count 2
[166632.578887] buffer dirty: block 35554 count 1
[166632.583055] buffer dirty: block 35555 count 2
[166632.587226] buffer dirty: block 35556 count 1
[166632.591395] buffer dirty: block 35557 count 2
[166632.595574] buffer dirty: block 35558 count 1
[166632.599780] buffer dirty: block 35559 count 1
[166632.603989] buffer dirty: block 35560 count 3
[166632.608196] buffer dirty: block 35563 count 1
[166632.612446] buffer dirty: block 35564 count 3
[166632.616729] buffer dirty: block 35565 count 1
[166632.621013] buffer dirty: block 35567 count 1
[166632.625222] buffer dirty: block 35568 count 3
[166632.629432] buffer dirty: block 35569 count 1
[166632.633643] buffer dirty: block 35570 count 1
[166632.637849] buffer dirty: block 35571 count 1
[166632.642020] buffer dirty: block 35572 count 2
[166632.646190] buffer dirty: block 35573 count 2
[166632.650316] buffer dirty: block 35574 count 1
[166632.654448] buffer dirty: block 35575 count 2
[166632.658569] buffer dirty: block 35576 count 1
[166632.662693] buffer dirty: block 35577 count 1
[166632.666776] buffer dirty: block 35578 count 2
[166632.670902] buffer dirty: block 35579 count 2
[166632.674989] buffer dirty: block 35580 count 1
[166632.679078] buffer dirty: block 35583 count 2
[166632.683166] buffer dirty: block 35584 count 2
[166632.687216] buffer dirty: block 35585 count 1
[166632.691299] buffer dirty: block 35587 count 2
[166632.695420] buffer dirty: block 35588 count 1
[166632.699540] buffer dirty: block 35589 count 2
[166632.703657] buffer dirty: block 35590 count 1
[166632.707955] buffer dirty: block 35591 count 1
[166632.712075] buffer dirty: block 35592 count 1
[166632.716151] buffer dirty: block 35593 count 1
[166632.720187] buffer dirty: block 35594 count 3
[166632.724299] buffer dirty: block 35595 count 1
[166632.728375] buffer dirty: block 35597 count 2
[166632.732556] buffer dirty: block 35598 count 2
[166632.736610] buffer dirty: block 35599 count 2
[166632.740614] buffer dirty: block 35600 count 1
[166632.744688] buffer dirty: block 35603 count 4
[166632.748791] buffer dirty: block 35605 count 1
[166632.752897] buffer dirty: block 35606 count 1
[166632.757033] buffer dirty: block 35607 count 1
[166632.761136] buffer dirty: block 35608 count 2
[166632.765271] buffer dirty: block 35609 count 2
[166632.769409] buffer dirty: block 35610 count 1
[166632.773546] buffer dirty: block 35611 count 1
[166632.777652] buffer dirty: block 35613 count 2
[166632.781755] buffer dirty: block 35614 count 2
[166632.785898] buffer dirty: block 35616 count 2
[166632.790067] buffer dirty: block 35617 count 1
[166632.794205] buffer dirty: block 35618 count 3
[166632.798306] buffer dirty: block 35619 count 1
[166632.802439] buffer dirty: block 35620 count 1
[166632.806579] buffer dirty: block 35621 count 1
[166632.810682] buffer dirty: block 35622 count 2
[166632.814749] buffer dirty: block 35623 count 1
[166632.818817] buffer dirty: block 35624 count 1
[166632.822850] buffer dirty: block 35626 count 4
[166632.826910] buffer dirty: block 35628 count 2
[166632.830971] buffer dirty: block 35629 count 1
[166632.835112] buffer dirty: block 35630 count 2
[166632.839290] buffer dirty: block 35632 count 1
[166632.843435] buffer dirty: block 35633 count 1
[166632.847543] buffer dirty: block 35634 count 1
[166632.851611] buffer dirty: block 35635 count 1
[166632.855679] buffer dirty: block 35636 count 1
[166632.859782] buffer dirty: block 35637 count 1
[166632.863805] buffer dirty: block 35638 count 5
[166632.867796] buffer dirty: block 35639 count 1
[166632.871789] buffer dirty: block 35642 count 1
[166632.875784] buffer dirty: block 35643 count 2
[166632.879971] buffer dirty: block 35644 count 2
[166632.883960] buffer dirty: block 35645 count 1
[166632.888025] buffer dirty: block 35646 count 2
[166632.892087] buffer dirty: block 35648 count 3
[166632.896154] buffer dirty: block 35649 count 1
[166632.900291] buffer dirty: block 35650 count 2
[166632.904422] buffer dirty: block 35652 count 1
[166632.908574] buffer dirty: block 35653 count 2
[166632.912757] buffer dirty: block 35654 count 2
[166632.916904] buffer dirty: block 35656 count 3
[166632.921019] buffer dirty: block 35657 count 1
[166632.925166] buffer dirty: block 35658 count 1
[166632.929317] buffer dirty: block 35659 count 2
[166632.933461] buffer dirty: block 35660 count 1
[166632.937615] buffer dirty: block 35663 count 1
[166632.941768] buffer dirty: block 35664 count 2
[166632.945888] buffer dirty: block 35665 count 1
[166632.950007] buffer dirty: block 35666 count 1
[166632.954054] buffer dirty: block 35667 count 1
[166632.958098] buffer dirty: block 35668 count 1
[166632.962130] buffer dirty: block 35669 count 2
[166632.966199] buffer dirty: block 35670 count 3
[166632.970344] buffer dirty: block 35673 count 1
[166632.974530] buffer dirty: block 35674 count 1
[166632.978683] buffer dirty: block 35675 count 2
[166632.982876] buffer dirty: block 35676 count 1
[166632.987069] buffer dirty: block 35678 count 1
[166632.991219] buffer dirty: block 35679 count 4
[166632.995372] buffer dirty: block 35683 count 2
[166632.999496] buffer dirty: block 35684 count 1
[166633.003662] buffer dirty: block 35685 count 1
[166633.007809] buffer dirty: block 35686 count 1
[166633.011994] buffer dirty: block 35687 count 1
[166633.016019] buffer dirty: block 35688 count 2
[166633.020042] buffer dirty: block 35689 count 2
[166633.024052] buffer dirty: block 35690 count 1
[166633.028096] buffer dirty: block 35691 count 1
[166633.032132] buffer dirty: block 35693 count 1
[166633.036170] buffer dirty: block 35694 count 1
[166633.040205] buffer dirty: block 35696 count 2
[166633.044235] buffer dirty: block 35697 count 1
[166633.048338] buffer dirty: block 35698 count 1
[166633.052433] buffer dirty: block 35699 count 3
[166633.056548] buffer dirty: block 35701 count 1
[166633.060669] buffer dirty: block 35702 count 1
[166633.064800] buffer dirty: block 35703 count 2
[166633.068934] buffer dirty: block 35704 count 1
[166633.073105] buffer dirty: block 35705 count 1
[166633.077244] buffer dirty: block 35706 count 1
[166633.081350] buffer dirty: block 35707 count 1
[166633.085417] buffer dirty: block 35708 count 1
[166633.089409] buffer dirty: block 35709 count 2
[166633.093433] buffer dirty: block 35710 count 1
[166633.097534] buffer dirty: block 35711 count 1
[166633.101628] buffer dirty: block 35712 count 1
[166633.105686] buffer dirty: block 35713 count 2
[166633.109818] buffer dirty: block 35715 count 2
[166633.113908] buffer dirty: block 35716 count 2
[166633.117958] buffer dirty: block 35717 count 1
[166633.122037] buffer dirty: block 35718 count 2
[166633.126112] buffer dirty: block 35719 count 1
[166633.130229] buffer dirty: block 35720 count 1
[166633.134346] buffer dirty: block 35721 count 1
[166633.138425] buffer dirty: block 35722 count 2
[166633.142506] buffer dirty: block 35723 count 3
[166633.146558] buffer dirty: block 35726 count 2
[166633.150646] buffer dirty: block 35728 count 3
[166633.154777] buffer dirty: block 35729 count 1
[166633.158914] buffer dirty: block 35730 count 1
[166633.163011] buffer dirty: block 35731 count 1
[166633.167076] buffer dirty: block 35732 count 2
[166633.171179] buffer dirty: block 35733 count 2
[166633.175242] buffer dirty: block 35734 count 2
[166633.179260] buffer dirty: block 35735 count 1
[166633.183519] buffer dirty: block 35736 count 1
[166633.187544] buffer dirty: block 35738 count 4
[166633.191633] buffer dirty: block 35739 count 2
[166633.195897] buffer dirty: block 35741 count 1
[166633.200026] buffer dirty: block 35742 count 1
[166633.204191] buffer dirty: block 35743 count 2
[166633.208362] buffer dirty: block 35746 count 2
[166633.212499] buffer dirty: block 35748 count 3
[166633.216599] buffer dirty: block 35749 count 2
[166633.220699] buffer dirty: block 35750 count 1
[166633.224833] buffer dirty: block 35752 count 2
[166633.228931] buffer dirty: block 35753 count 3
[166633.233111] buffer dirty: block 35754 count 1
[166633.237313] buffer dirty: block 35756 count 1
[166633.241488] buffer dirty: block 35758 count 4
[166633.245667] buffer dirty: block 35759 count 2
[166633.249841] buffer dirty: block 35760 count 1
[166633.254052] buffer dirty: block 35762 count 2
[166633.258270] buffer dirty: block 35763 count 3
[166633.262523] buffer dirty: block 35764 count 1
[166633.266776] buffer dirty: block 35765 count 1
[166633.270959] buffer dirty: block 35766 count 2
[166633.275140] buffer dirty: block 35768 count 2
[166633.279283] buffer dirty: block 35769 count 2
[166633.283421] buffer dirty: block 35771 count 2
[166633.287529] buffer dirty: block 35772 count 1
[166633.291639] buffer dirty: block 35773 count 1
[166633.295712] buffer dirty: block 35775 count 1
[166633.299970] buffer dirty: block 35776 count 1
[166633.303976] buffer dirty: block 35777 count 2
[166633.308047] buffer dirty: block 35778 count 1
[166633.312089] buffer dirty: block 35779 count 1
[166633.316122] buffer dirty: block 35780 count 1
[166633.320119] buffer dirty: block 35781 count 2
[166633.324185] buffer dirty: block 35782 count 2
[166633.328244] buffer dirty: block 35784 count 1
[166633.332323] buffer dirty: block 35785 count 1
[166633.336382] buffer dirty: block 35786 count 1
[166633.340441] buffer dirty: block 35787 count 2
[166633.344503] buffer dirty: block 35788 count 1
[166633.348564] buffer dirty: block 35789 count 2
[166633.352625] buffer dirty: block 35792 count 5
[166633.356694] buffer dirty: block 35793 count 1
[166633.360796] buffer dirty: block 35795 count 1
[166633.364898] buffer dirty: block 35796 count 2
[166633.369004] buffer dirty: block 35797 count 1
[166633.373136] buffer dirty: block 35798 count 4
[166633.377268] buffer dirty: block 35799 count 2
[166633.381398] buffer dirty: block 35800 count 1
[166633.385531] buffer dirty: block 35801 count 1
[166633.389664] buffer dirty: block 35802 count 1
[166633.393754] buffer dirty: block 35803 count 1
[166633.397846] buffer dirty: block 35804 count 1
[166633.401937] buffer dirty: block 35806 count 1
[166633.406030] buffer dirty: block 35807 count 1
[166633.410083] buffer dirty: block 35808 count 2
[166633.414210] buffer dirty: block 35809 count 2
[166633.418341] buffer dirty: block 35811 count 1
[166633.422479] buffer dirty: block 35812 count 1
[166633.426576] buffer dirty: block 35813 count 1
[166633.430668] buffer dirty: block 35815 count 2
[166633.434769] buffer dirty: block 35816 count 4
[166633.438936] buffer dirty: block 35818 count 1
[166633.443067] buffer dirty: block 35819 count 2
[166633.447205] buffer dirty: block 35820 count 1
[166633.451348] buffer dirty: block 35821 count 1
[166633.455492] buffer dirty: block 35822 count 1
[166633.459603] buffer dirty: block 35824 count 2
[166633.463711] buffer dirty: block 35825 count 1
[166633.467821] buffer dirty: block 35826 count 2
[166633.471998] buffer dirty: block 35827 count 2
[166633.476031] buffer dirty: block 35828 count 2
[166633.479995] buffer dirty: block 35829 count 1
[166633.483957] buffer dirty: block 35830 count 2
[166633.484035] buffer dirty: block 35832 count 2
[166633.488006] buffer dirty: block 35834 count 2
[166633.491937] buffer dirty: block 35835 count 2
[166633.495863] buffer dirty: block 35836 count 2
[166633.499748] buffer dirty: block 35838 count 2
[166633.503592] buffer dirty: block 35839 count 1
[166633.507479] buffer dirty: block 35840 count 2
[166633.511407] buffer dirty: block 35842 count 2
[166633.515374] buffer dirty: block 35843 count 1
[166633.519376] buffer dirty: block 35844 count 1
[166633.523369] buffer dirty: block 35845 count 2
[166633.527366] buffer dirty: block 35846 count 2
[166633.531393] buffer dirty: block 35848 count 2
[166633.535411] buffer dirty: block 35849 count 2
[166633.539425] buffer dirty: block 35851 count 1
[166633.543484] buffer dirty: block 35852 count 3
[166633.547574] buffer dirty: block 35853 count 1
[166633.551630] buffer dirty: block 35854 count 1
[166633.555645] buffer dirty: block 35856 count 2
[166633.559692] buffer dirty: block 35857 count 1
[166633.563768] buffer dirty: block 35858 count 1
[166633.567843] buffer dirty: block 35859 count 3
[166633.571960] buffer dirty: block 35861 count 1
[166633.576081] buffer dirty: block 35862 count 4
[166633.583931] buffer dirty: block 35866 count 1
[166633.588061] buffer dirty: block 35867 count 1
[166633.592174] buffer dirty: block 35868 count 2
[166633.596299] buffer dirty: block 35869 count 2
[166633.600418] buffer dirty: block 35872 count 2
[166633.604467] buffer dirty: block 35874 count 1
[166633.608587] buffer dirty: block 35876 count 1
[166633.612672] buffer dirty: block 35877 count 3
[166633.616798] buffer dirty: block 35878 count 2
[166633.620961] buffer dirty: block 35879 count 1
[166633.625124] buffer dirty: block 35880 count 2
[166633.629328] buffer dirty: block 35881 count 2
[166633.633523] buffer dirty: block 35882 count 2
[166633.637897] buffer dirty: block 1081370 count 1
[166633.642089] buffer dirty: block 2588673 count 1
[166633.646391] buffer dirty: block 2588727 count 2
[166633.650767] Total number of dirty buffers: 24754

for /home

and

[166982.440144] buffer dirty: block 31549 count 1
[166982.443561] buffer dirty: block 31573 count 1
[166982.446978] buffer dirty: block 31586 count 1
[166982.450372] buffer dirty: block 31590 count 1
[166982.453800] buffer dirty: block 31601 count 1
[166982.457235] buffer dirty: block 31609 count 1
[166982.460667] buffer dirty: block 31611 count 1
[166982.464047] buffer dirty: block 31614 count 1
[166982.467477] buffer dirty: block 31615 count 1
[166982.470903] buffer dirty: block 31621 count 1
[166982.474333] buffer dirty: block 31634 count 1
[166982.477760] buffer dirty: block 31644 count 1
[166982.481154] buffer dirty: block 31645 count 1
[166982.484538] buffer dirty: block 31648 count 2
[166982.487915] buffer dirty: block 31651 count 1
[166982.491929] buffer dirty: block 31659 count 1
[166982.495424] buffer dirty: block 31660 count 1
[166982.498919] buffer dirty: block 31662 count 1
[166982.502421] buffer dirty: block 31666 count 1
[166982.505912] buffer dirty: block 31667 count 1
[166982.509365] buffer dirty: block 31668 count 1
[166982.512218] buffer dirty: block 31676 count 1
[166982.515629] buffer dirty: block 31697 count 1
[166982.519043] buffer dirty: block 31700 count 1
[166982.522461] buffer dirty: block 31701 count 1
[166982.525872] buffer dirty: block 31704 count 1
[166982.529258] buffer dirty: block 31708 count 1
[166982.532642] buffer dirty: block 31713 count 1
[166982.536013] buffer dirty: block 31738 count 2
[166982.539441] buffer dirty: block 31751 count 2
[166982.542868] buffer dirty: block 31754 count 1
[166982.546336] buffer dirty: block 31764 count 1
[166982.549799] buffer dirty: block 31787 count 1
[166982.553225] buffer dirty: block 31788 count 1
[166982.556649] buffer dirty: block 31795 count 1
[166982.560026] buffer dirty: block 31796 count 1
[166982.563448] buffer dirty: block 31809 count 1
[166982.566881] buffer dirty: block 31810 count 1
[166982.570324] buffer dirty: block 31822 count 1
[166982.573766] buffer dirty: block 31833 count 1
[166982.577208] buffer dirty: block 31834 count 1
[166982.580648] buffer dirty: block 31837 count 1
[166982.584060] buffer dirty: block 31840 count 1
[166982.587460] buffer dirty: block 31843 count 1
[166982.590891] buffer dirty: block 31846 count 1
[166982.594249] buffer dirty: block 31849 count 1
[166982.597571] buffer dirty: block 31862 count 1
[166982.600859] buffer dirty: block 31878 count 1
[166982.604131] buffer dirty: block 31886 count 1
[166982.607427] buffer dirty: block 31889 count 1
[166982.610722] buffer dirty: block 31896 count 1
[166982.614052] buffer dirty: block 31899 count 1
[166982.617373] buffer dirty: block 31903 count 1
[166982.620660] buffer dirty: block 31906 count 1
[166982.623963] buffer dirty: block 31907 count 1
[166982.627985] buffer dirty: block 31912 count 1
[166982.631376] buffer dirty: block 31920 count 1
[166982.634768] buffer dirty: block 31936 count 1
[166982.638119] buffer dirty: block 31937 count 1
[166982.641467] buffer dirty: block 31943 count 1
[166982.644111] buffer dirty: block 31947 count 1
[166982.647427] buffer dirty: block 31950 count 1
[166982.650742] buffer dirty: block 31953 count 1
[166982.654054] buffer dirty: block 31956 count 2
[166982.657401] buffer dirty: block 31967 count 1
[166982.660791] buffer dirty: block 31980 count 1
[166982.664088] buffer dirty: block 31981 count 1
[166982.667466] buffer dirty: block 31990 count 1
[166982.670845] buffer dirty: block 31998 count 1
[166982.674225] buffer dirty: block 31999 count 1
[166982.677602] buffer dirty: block 32002 count 1
[166982.680986] buffer dirty: block 32006 count 1
[166982.684363] buffer dirty: block 32030 count 1
[166982.687736] buffer dirty: block 32031 count 1
[166982.691751] buffer dirty: block 32032 count 1
[166982.695184] buffer dirty: block 32035 count 1
[166982.698611] buffer dirty: block 32049 count 1
[166982.702032] buffer dirty: block 32059 count 1
[166982.705452] buffer dirty: block 32065 count 1
[166982.708201] buffer dirty: block 32079 count 1
[166982.711583] buffer dirty: block 32082 count 1
[166982.714999] buffer dirty: block 32083 count 1
[166982.718395] buffer dirty: block 32096 count 1
[166982.721814] buffer dirty: block 32109 count 1
[166982.725212] buffer dirty: block 32123 count 1
[166982.728601] buffer dirty: block 32126 count 1
[166982.731973] buffer dirty: block 32132 count 1
[166982.736004] buffer dirty: block 32138 count 1
[166982.739399] buffer dirty: block 32146 count 1
[166982.742793] buffer dirty: block 32155 count 1
[166982.746225] buffer dirty: block 32156 count 1
[166982.749652] buffer dirty: block 32168 count 1
[166982.752417] buffer dirty: block 32169 count 1
[166982.755789] buffer dirty: block 32170 count 1
[166982.759844] buffer dirty: block 32171 count 1
[166982.763194] buffer dirty: block 32175 count 1
[166982.766542] buffer dirty: block 32181 count 1
[166982.769890] buffer dirty: block 32182 count 1
[166982.772614] buffer dirty: block 32184 count 1
[166982.775947] buffer dirty: block 32188 count 1
[166982.779961] buffer dirty: block 32189 count 1
[166982.783334] buffer dirty: block 32190 count 1
[166982.786711] buffer dirty: block 32191 count 1
[166982.790093] buffer dirty: block 32193 count 1
[166982.793437] buffer dirty: block 32194 count 1
[166982.796097] buffer dirty: block 32197 count 1
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[166983.495167] Total number of dirty buffers: 5421

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