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    SubjectRe: possible (ext4 related?) memory leak in kernel 2.6.26
    [ Reply-to set to linux-ext4@vger.kernel.org ]

    On Tue, Sep 30, 2008 at 10:27:29PM +0200, Quentin Godfroy wrote:
    > Hi lists,
    > I'd like to report the following problem : after ~ 10 days' uptime on a
    > Debian 2.6.26-1-686 kernel, my system becomes extremely sluggish and
    > unresponsive and the OOM-killer starts targeting even innocent processes like
    > identd or rsync (when the swap is disabled). The machine is low on RAM (192
    > MB) but this has never been a problem before. As for the slowness, strace
    > shows that the brk() syscall takes ages to complete; the blocking processes
    > are in the D state (and for some reason the kernel gives no wchan info).
    >
    > Config has nothing unusual except that all fs are ext4, which I am begining
    > to suspect may be the culprit, as every night some process stat()s and
    > read()s something like 850,000 files, which is maybe fs-stressing; also,
    > umounting then remounting /home makes the 'buffers' drop from 127304 to
    > 55920 and partially solves the problem.
    >
    > Free reports a large and constantly growing 'buffers' figure (more than
    > 50% of the available memory). No userland processes seems to be consuming
    > lare amounts of memory (sum of RSS in 'ps aux' is about 30 megs), and the
    > overall system is mostly idle.
    >
    > for instance, the following command reports
    >
    > $ free ; dpkg -l '*' >/dev/null; dmesg | tail -n 2
    > total used free shared buffers cached
    > Mem: 190356 178920 11436 0 126104 12520
    > -/+ buffers/cache: 40296 150060
    > Swap: 0 0 0
    > /* Waits a minute or so */
    > Killed
    > [811245.911859] Out of memory: kill process 6639 (dpkg-query) score 7292 or a child
    > [811245.911972] Killed process 6639 (dpkg-query)
    >

    Can you send the output of /proc/meminfo and /proc/slabinfo?

    - Ted


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