Re: [uml-devel] UML not returning memory

[Michael Richardson <mcr@sandelman.ottawa.on.ca>]

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>>>>> "BlaisorBlade" == BlaisorBlade  <blaisorblade_spam@yahoo.it> writes:
    >> Host:
    >> 
    >> gimli-[aggr/testing/pluto/basic-pluto-01] mcr 1097 %uname -a
    >> Linux gimli 2.4.24 #4 Tue Mar 9 22:18:59 EST 2004 i686 GNU/Linux
    >> debian-sarge, linus kernel.  I seem to be running in TT mode,
    >> rather than MM.
    BlaisorBlade> Ah, ok, you mean SKAS mode, right? However, please
    BlaisorBlade> make sure that /proc/mm does not exist; if it exists
    BlaisorBlade> you are running in SKAS mode.

  Not running in SKAS. no /proc/mm on host.

    >> Any ideas of where else memory might be disappearing to?

    BlaisorBlade> The host kernel allocates his own memory (let's say it
    BlaisorBlade> has his kmalloc'ed() memory) - this is the only
    BlaisorBlade> possible idea I have.  To check this, please go
    BlaisorBlade> posting before/after reboot, together with this data
    BlaisorBlade> (please take another shoot of this data), the content
    BlaisorBlade> of /proc/slabinfo and /proc/meminfo. Also, please go
    BlaisorBlade> in runlevel 1:

  okay, slabinfo and meminfo.

    BlaisorBlade> Finally, please attach everything - I don't care if it
    BlaisorBlade> is one file or separate files, but just that it's not
    BlaisorBlade> inline in the mail. I prefer to avoid line wrapping
    BlaisorBlade> and such things.

  okay.

    BlaisorBlade> However, are you able to reproduce this on a box
    BlaisorBlade> without Open/FreeSWAN installed (I don't know what you
    BlaisorBlade> are using here)? If the new data I've requested you
    BlaisorBlade> that the bug is in the host kernel, either it is in
    BlaisorBlade> the vanilla kernel or it is in the Open/FreeSWAN
    BlaisorBlade> patch, or in whatever other patches you have applied.

  That's certainly possible.
  I can disable IPsec on the host, but it is compiled in, so it will
still initialize.  If I need to rebuild host kernel, I'll do that, but
not today.

    BlaisorBlade> Having said this, I must note that something similar
    BlaisorBlade> happened (in some special configurations) on host
    BlaisorBlade> kernels with SKAS patch; but only with the version for
    BlaisorBlade> kernel >= 2.4.25, and with UML in SKAS mode, and with
    BlaisorBlade> the very first patch I posted on my web-site; I fixed
    BlaisorBlade> this months ago.

  Yes, this is what has me most confused.
  I would have expected issues with SKAS.
  I keep thinking that maybe it is all in disk buffers, but the numbers
do not make sense to me.

- --
]     "Elmo went to the wrong fundraiser" - The Simpson         |  firewalls  [
]   Michael Richardson,    Xelerance Corporation, Ottawa, ON    |net architect[
] mcr@xelerance.com      http://www.sandelman.ottawa.on.ca/mcr/ |device driver[
] panic("Just another Debian GNU/Linux using, kernel hacking, security guy"); [
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