[uml-devel] plenty of "/proc/mm map failed" in syslog

[uml-devel] plenty of "/proc/mm map failed" in syslog

[Sven Köhler]

Hi,

i wrote a simple test-program to stress-test UML.

#!/usr/bin/perl
while (true)
{
   push @a, "a";
}

While executing it, i got plenty of thos messages in syslog:
Mar 14 15:59:01 localhost kernel:  12
Mar 14 15:59:01 localhost kernel: map : /proc/mm map failed, err = 12
Mar 14 15:59:02 localhost last message repeated 1321 times
Mar 14 15:59:02 localhost kernel:  12
Mar 14 15:59:02 localhost kernel: map : /proc/mm map failed, err = 12
Mar 14 15:59:02 localhost last message repeated 3216 times
Mar 14 15:59:02 localhost kernel:  12
Mar 14 15:59:02 localhost kernel: map : /proc/mm map failed, err = 12
Mar 14 15:59:02 localhost last message repeated 786 times
Mar 14 15:59:03 localhost kernel:  12
Mar 14 15:59:03 localhost kernel: map : /proc/mm map failed, err = 12

I expected perl to get killed or get an "out of memory"-error, cause the 
UML didn't have swap and only 128MB memory.

So are those errors normal?
I'm using 2.6.4-um1 in SKAS-mode running on 2.6.4 host patched with 
BlaisorBlades's 2.6.3-skas3 patch.

If i run the script on the host-machine, perl get's killed as expected.
(the new "kill best process"-stuff is not turned on in the host's 
kernel-config)

Thx
   Sven



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Re: [uml-devel] plenty of "/proc/mm map failed" in syslog

[Adrian Phillips]

>>>>> "Sven" == Sven Köhler <skoehler@upb.de> writes:

    Sven> While executing it, i got plenty of thos messages in syslog:
    Sven> Mar 14 15:59:01 localhost kernel: 12 Mar 14 15:59:01
    Sven> localhost kernel: map : /proc/mm map failed, err = 12 Mar 14
    Sven> 15:59:02 localhost last message repeated 1321 times Mar 14
    Sven> 15:59:02 localhost kernel: 12 Mar 14 15:59:02 localhost
    Sven> kernel: map : /proc/mm map failed, err = 12 Mar 14 15:59:02
    Sven> localhost last message repeated 3216 times Mar 14 15:59:02
    Sven> localhost kernel: 12 Mar 14 15:59:02 localhost kernel: map :
    Sven> /proc/mm map failed, err = 12 Mar 14 15:59:02 localhost last
    Sven> message repeated 786 times Mar 14 15:59:03 localhost kernel:
    Sven> 12 Mar 14 15:59:03 localhost kernel: map : /proc/mm map
    Sven> failed, err = 12

    Sven> I expected perl to get killed or get an "out of
    Sven> memory"-error, cause the UML didn't have swap and only 128MB
    Sven> memory.

Please check the user archives for the last 3 months or google for mm
map failed.

Sincerely,

Adrian Phillips

-- 
Who really wrote the works of William Shakespeare ?
http://www.pbs.org/wgbh/pages/frontline/shakespeare/


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[uml-devel] Re: plenty of "/proc/mm map failed" in syslog

[Sven Köhler]

> Please check the user archives for the last 3 months or google for mm
> map failed.

so i guess the UML kernel couldn't allocate more memory, but why wasn't 
the perl-process killed like it should?



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[uml-devel] Re: plenty of "/proc/mm map failed" in syslog

[Sven Köhler]

> Please check the user archives for the last 3 months or google for mm
> map failed.

http://usermodelinux.org/modules.php?name=News&file=article&sid=154

the page says, that i should use /proc/sys/vm/max_map_count but it 
doesn't seem to exist on my 2.6 host.



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