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

[Willem Huisman]

F.Y.I.

OpenSim 0.6.4.9332
Debian Lenny 5.0.1
Mono JIT compiler version 20090414
(tarball Mon Apr 27 13:11:24 CEST 2009)

Compiled and installed  Mono from source recently. One thing I noticed
during  the 'make install', albeit it in a flash on screen, is that there
were compilation warnings during the use of mini-trampoline.cs ( don't
remember specific names ) where ".... type was declared but it's value is
never used".

The mini-trampoline error/crash while starting opensim always happens
when
 the section of scripts starts. Never happens earlier. I mean , the crash
, in my case
with XEngine , always occurs at [XEngine] NameScriptLoading . After these
crashes I
also noticed shutting down all of UGAIM and restarting them, made the
crash 'stay away'.

As I type I am starting and shutting down to reproduce the crash. I will
check Mantis if
I can add debug info , if any at all.

My efforts till now to backtrace with gdb have been unsuccesful. There
are no debugging symbols for opensim,
or better, I do not know how to create/obtain them. Tried to hook gdb to
the opensim' pid-id, but that stalls the running
opensim instance completely.

Maybe I should reinstall Mono and catch the warnings of the types of
mini-trampolines.cs .. :S

  ----- Original Message -----
  From: "Mic Bowman"
  To: opensim-users at lists.berlios.de
  Subject: Re: [Opensim-users] Ubuntu and magic mini-trampolines (crash
  problem)
  Date: Tue, 28 Apr 2009 08:16:10 -0700


  in general we see crashes, not freezes. the apparent freeze is
  usually
  caused by the gdb process that gets started when the crash occurs
  (kill the gdb process and the simulator crashes "gracefully").

  given that the problem seems to happen when log4net attempts to get a
  logger associated with a particular script class, my guess is that
  one
  of a couple problems is happening... 1) mono is somehow messing up
  the
  class that is passed in (there are nulls in the argument stack that
  look suspicious), 2) log4net isn't as thread-safe as it claims
  (though
  the routine that creates the wrapper object looks fine at first
  glance), 3) somehow mono is screwing up the assembly binding when
  log4net creates the wrapper. I've looked at the mono code that is
  throwing the exception... but it wasn't very helpful without a LOT
  more investigation.

  at this point, i'm building a custom log4net dll with some additional
  debugging in it. which, given that this certainly appears to be a
  timing issue, will almost certainly hide the problem. :-(

  --mic


  On Tue, Apr 28, 2009 at 5:04 AM, Dr Scofield
  wrote:
  > Mic Bowman wrote:
  >> we've seen the problem with mono_threads_per_cpu set across a
  range of
  >> values (i think we've tried a number of values from 100 to 1000).
  >> there doesn't appear to be any correlation.
  >
  > ok. we had freezes that got cured by increasing
  MONO_THREADS_PER_CPU, hence
  > my
  > asking...
  >
  > a real deadlock is nasty... :-( sigh.
  >
  >  DrS/dirk
  >>
  >> --mic
  >>
  >>
  >> On Mon, Apr 27, 2009 at 10:38 PM, dr scofield
  >> wrote:
  >>> Justin Clark-Casey wrote:
  >>>
  >>> Mic Bowman wrote:
  >>>
  >>>
  >>> I have the same freeze at times. In my case there's a gdb process
  >>> running that I can kill off to terminate the simulator.
  >>>
  >>>
  >>>
  >>> I presume there's no revealing deadlock information in the thread
  dump
  >>> (perhaps that's too much to hope for :) ?
  >>>
  >>>
  >>> what is your value of the MONO_THREADS_PER_CPU environment
  variable?
  >>>
  >>> --
  >>> dr dirk husemann ---- math & computer science ---- ibm zurich
  research lab
  >>> RL: hud at zurich.ibm.com - +41 44 724 8573 -
  http://www.zurich.ibm.com/~hud/
  >>> SL: drscofield at xyzzyxyzzy.net ---------------------
  http://xyzzyxyzzy.net/
  >>>
  >>> _______________________________________________
  >>> Opensim-users mailing list
  >>> Opensim-users at lists.berlios.de
  >>> https://lists.berlios.de/mailman/listinfo/opensim-users
  >>>
  >>>
  >> _______________________________________________
  >> Opensim-users mailing list
  >> Opensim-users at lists.berlios.de
  >> https://lists.berlios.de/mailman/listinfo/opensim-users
  >>
  >
  >
  > --
  > dr dirk husemann ---- virtual worlds research ---- ibm zurich
  research lab
  > SL: dr scofield ---- drscofield at xyzzyxyzzy.net ----
  http://xyzzyxyzzy.net/
  > RL: hud at zurich.ibm.com - +41 44 724 8573 -
  http://www.zurich.ibm.com/~hud/
  > _______________________________________________
  > Opensim-users mailing list
  > Opensim-users at lists.berlios.de
  > https://lists.berlios.de/mailman/listinfo/opensim-users
  >
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