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    SubjectRe: 2.6.39-rc4+: Kernel leaking memory during FS scanning, regression?
    On Sun, Apr 24, 2011 at 22:42, KOSAKI Motohiro wrote:
    >> On Sun, 24 April 2011 Bruno Prémont wrote:
    >> > On an older system I've been running Gentoo's revdep-rebuild to check
    >> > for system linking/*.la consistency and after doing most of the work the
    >> > system starved more or less, just complaining about stuck tasks now and
    >> > then.
    >> > Memory usage graph as seen from userspace showed sudden quick increase of
    >> > memory usage though only a very few MB were swapped out (c.f. attached RRD
    >> > graph).
    >>
    >> Seems I've hit it once again (though detected before system was fully
    >> stalled by trying to reclaim memory without success).
    >>
    >> This time it was during simple compiling...
    >> Gathered info below:
    >>
    >> /proc/meminfo:
    >> MemTotal:         480660 kB
    >> MemFree:           64948 kB
    >> Buffers:           10304 kB
    >> Cached:             6924 kB
    >> SwapCached:         4220 kB
    >> Active:            11100 kB
    >> Inactive:          15732 kB
    >> Active(anon):       4732 kB
    >> Inactive(anon):     4876 kB
    >> Active(file):       6368 kB
    >> Inactive(file):    10856 kB
    >> Unevictable:          32 kB
    >> Mlocked:              32 kB
    >> SwapTotal:        524284 kB
    >> SwapFree:         456432 kB
    >> Dirty:                80 kB
    >> Writeback:             0 kB
    >> AnonPages:          6268 kB
    >> Mapped:             2604 kB
    >> Shmem:                 4 kB
    >> Slab:             250632 kB
    >> SReclaimable:      51144 kB
    >> SUnreclaim:       199488 kB   <--- look big as well...
    >> KernelStack:      131032 kB   <--- what???
    >
    > KernelStack is used 8K bytes per thread. then, your system should have
    > 16000 threads. but your ps only showed about 80 processes.
    > Hmm... stack leak?

    i might have a similar report for 2.6.39-rc4 (seems to be working fine
    in 2.6.38.4), but for embedded Blackfin systems running gdbserver
    processes over and over (so lots of short lived forks)

    i wonder if you have a lot of zombies or otherwise unclaimed resources
    ? does `ps aux` show anything unusual ?
    -mike
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