[Mono-dev] xbuild - ** ERROR **: shm_semaphores_init: semget error: No space left on device.

[Rafael Teixeira]

Have you tried to set MONO_DISABLE_SHM? From the top of my mind there
is where a huge use of semaphores are used to simulate the shared
memory files used for cross-process, but I may be mixing things. If
you're using it you can try to disable it, and see if things gets
better.

Just my two cents,
Rafael "Monoman" Teixeira
---------------------------------------
"We live in a world operated by science and technology. We have also
arranged things so that almost no one understands science and
technology. This is a prescription for disaster. We might get away
with it for a while, but sooner or later this combustible mixture of
ignorance and power is going to blow up in our faces."
-Carl Sagan


On Fri, Nov 12, 2010 at 4:53 AM, Arne Claassen <arnec at mindtouch.com> wrote:
>
> I'm running mono 2.6.7 (novell rpms) on centos 5.5 w/ mod_mono and
> I've twice run into xbuild stopping to work with this error:
>
> ** ERROR **: shm_semaphores_init: semget error: No space left on device.
>
> I don't have the full error right now, since i rebooted the machine
> again and didn't capture it first. But it talks about either removing
> semaphores using ipcrm and ipcs or increasing the max semaphores
>
> After restart, ipcs has no Semaphore Arrays, but after i hit my
> various asp.net apps, that output quickly goes up:
>
>
> ------ Shared Memory Segments --------
> key        shmid      owner      perms      bytes      nattch     status
> 0x0101400b 327680     root       600        52828      45
> 0x01014069 360449     root       600        52828      26
> 0x740102df 131074     root       600        4          0
> 0x010140af 393219     root       600        52828      26
> 0x010140b1 425988     root       600        52828      26
>
> ------ Semaphore Arrays --------
> key        semid      owner      perms      nsems
> 0x00000000 0          root       600        1
> 0x00000000 65537      apache     600        1
> 0x00000000 98306      apache     600        1
> 0x00000000 131075     apache     600        1
> 0x00000000 163844     apache     600        1
> 0x00000000 196613     apache     600        1
> ....
> etc.
>
> When the error occured, that list of arrays was about 100 long.
> restarting apache, mod_mono, etc didn't help. Killing off semaphores
> using ipcrm seemed to get xbuild working again, but the asp.net apps
> then only returned blank pages. Finally I rebooted again.
>
> Not knowing what those semaphores are and what makes them increase,
> leaves me a bit worried. Do i just need more semphores (and how do i
> do that) or is xbuild just creating them and never cleaning them up?
> Any help understanding what this means and how to either prevent or at
> least clean it up would be greatly appreciated.
>
> cheers,
> Arne Claassen
>
> MindTouch
> San Diego, CA
> http://twitter.com/sdether
>
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