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

[John Hopkin]

Thanks, Mic.  I've put a monitor on that mantis, and I'll upgrade when
the patch comes through.  It's not a killer problem - if I can get the
sim up, which can take a couple of tries, it seems to stay up pretty
well, with only one crash so far during normal running, which was
during a border crossing.

John

Mic Bowman wrote:

>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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>>
-- 
John Hopkin