[Opensim-users] Ubuntu and magic mini-trampolines (crash problem)

[Mic Bowman]

there is a mantis for this (3237)...

i've been going through the various script engine calls to log4net and
commenting them out to get rid of the problem. two in particular
seemed to help. i'll put up another patch on that mantis in the next
couple days.

the problem comes and goes. i've tried various combinations of mono
threads, debug/release builds, and even rebuilt log4net. the more
scripts i have in a region that is restarting, the more likely the
problem occurs. there is clearly a race condition somewhere in the
mono 2.2 and 2.4 internals which opensim is tweaking.

--mic


On Wed, Apr 22, 2009 at 6:09 PM, John Hopkin
<opensim at jfhopkin.karoo.co.uk> wrote:
> Thanks.  I'll try that.  At the moment, it's working OK - it seems to
> be intermittent, whereas before it was during each bootup.  If/when it
> happens again, I'll drop that value.
>
> John
>
> Snoopy Pfeffer wrote:
>
>>I have experienced the same when MONO_THREADS_PER_CPU is set to a very high number. 500 works for me.
>>
>>  Snoopy Pfeffer
>>
>>
>>
>>
>>________________________________
>>From: John Hopkin <opensim at jfhopkin.karoo.co.uk>
>>To: opensim-users at lists.berlios.de
>>Sent: Thursday, April 23, 2009 1:50:37 AM
>>Subject: [Opensim-users] Ubuntu and magic mini-trampolines (crash problem)
>>
>>I've just upgraded Mono from 2.1 to 2.2 under Ubuntu Hardy, using Dr
>>Scofield's script from here:
>>
>>http://xyzzyxyzzy.net/2009/02/17/updated-mono-build-script-mono-22/
>>
>>and all went smoothly with that.
>>
>>But now, when I run OpenSim.exe, it loads OK at first, but then I get
>>the error:
>>
>><start paste>
>>Region (root) # 0x18 0x0 0x0 0x55 0x8b 0xec 0x57 0x56 0x83 0xec 0x20
>>0x8b 0x75 0x8 0x83 0xec 0x8 0x56 0x68 0x10 0x75 0xe8 0x9c 0x8b 0x5
>>0x10 0x75 0xe8 0x9c 0xff 0x50 0x34
>>**
>>ERROR:mini-trampolines.c:122:mono_magic_trampoline: assertion failed:
>>(vt)
>>Stacktrace:
>>
>>  at log4net.LogManager.WrapLogger (log4net.Core.ILogger) <0xffffffff>
>>  at log4net.LogManager.WrapLogger (log4net.Core.ILogger) <0x0001d>
>><end paste>
>>
>>and a long stacktrace.  The server crashes, of course.  Presumably,
>>the references to magic mini-trampolines are within the code; I don't
>>have any scripts or objects that I'm aware of like that.
>>
>>Vital stats:
>>
>>* OpenSim revision 9205 (binary package from OSGrid)
>>* Ubuntu Intrepid, kernel 2.6.27-11-generic
>>* Mono run with MONO_THREADS_PER_CPU set to 2000
>>* 7 regions run by one OpenSim.exe
>>*  P4/3.6GHz, 2GB RAM, more than adequate (or were under Mono 2.1)
>>* UGAIM through OSGrid
>>* MySQL 14.12
>>
>>I'm completely at a loss as to what could be causing this.  Does
>>anyone have any ideas?
> --
> John Hopkin
>
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