Levente, It is indeed not the UUID plugin - Dave already suggested deleting it, and I tried that w/o success. As for running gdb, I will gladly do so, but I have zero experience with it. The most relevant posts I can find mention attaching to a vm that is already running, and I can't get that far. Below is my attempt to modify the one-click shell script to run the vm under gdb. Perhaps you or someone else can show me the errors of my ways and produce something that would yield a callstack. Bill #!/bin/sh # path ROOT=`dirname $0` LINUX="$ROOT/Contents/Linux" RESOURCES="$ROOT/Contents/Resources" # icon gvfs-set-attribute \ "$0" \ "metadata::custom-icon" \ "file://$RESOURCES/Squeak.png" \ 2> /dev/null # execute gdb "$LINUX/squeakvm" gdb run -plugins "$LINUX" \ -encoding latin1 \ -vm-display-X11 \ "$RESOURCES/Pharo.image" Levente wrote: Well, the file OneClick.txt says the vm is "Linux Intel x86 4.0.3.2202". But that's not true, because that's not a CogVM. The UUIDPlugin seems to have the patch which avoids the crash, so it's pretty unlikely that it's an issue with the UUIDPlugin. Even if the patch is wrong (which is unlikely, because we're using Eliot's latest build on 64-bit Ubuntu 8.04 and it doesn't crash, but previous unpatched builds did crash), it's pretty unlikely that the cause of the crash is the related to UUIDPlugin at all, because UUIDs are normally not created during startup and your image is crashing on startup. To be 100% sure you can try deleting UUIDPlugin and see if your image is crashing or not. If it still crashes, then use gdb to see where it crashes. The VM seems to be unstripped (8MB), so it should be easy to identify the cause of the crash. Levente ________________________________________ From: pharo-project-bounces@lists.gforge.inria.fr [pharo-project-bounces@lists.gforge.inria.fr] On Behalf Of Schwab,Wilhelm K [bschwab@anest.ufl.edu] Sent: Friday, April 08, 2011 11:56 AM To: Pharo-project@lists.gforge.inria.fr; Squeak Virtual Machine Development Discussion Subject: Re: [Pharo-project] [Vm-dev] FW: Debugging Cog crash Levente, The image will not load at all. It simply dies with "Segmentation fault" - NOTHING else happens. gdb is maybe a possibility, but it is not an approach I ordinarily take, so some guidance would be helpful. I have a reproducible crash, but poor access to the affected box. Bill On Fri, 8 Apr 2011, Schwab,Wilhelm K wrote:

Gratuitous default recipient...

If there is a verbose dump option or other diagnostic efforts that will help, I will do my best to run them and report the results. I am fairly certain the vm is 'Croquet Closure Cog VM [CoInterpreter VMMaker-oscog.54]' (can verify later today), but this happened with an earlier Cog one-click too. There is something about the machine (UUID again?) that is different. I do not have root access to it, but I can get to a terminal. Ubuntu 10.10.

Where did you download the VM? Does it crash when you're trying to evaluate [UUID new]? Did you try gdb? Levente ________________________________________ From: pharo-project-bounces@lists.gforge.inria.fr [pharo-project-bounces@lists.gforge.inria.fr] On Behalf Of Schwab,Wilhelm K [bschwab@anest.ufl.edu] Sent: Friday, April 08, 2011 11:42 AM To: Pharo-project@lists.gforge.inria.fr; Squeak Virtual Machine Development Discussion Subject: Re: [Pharo-project] [Vm-dev] FW: Debugging Cog crash Dave, It was, I did :) No help :( What else can I try? Bill ________________________________________ From: pharo-project-bounces@lists.gforge.inria.fr [pharo-project-bounces@lists.gforge.inria.fr] On Behalf Of David T. Lewis [lewis@mail.msen.com] Sent: Friday, April 08, 2011 10:32 AM To: Squeak Virtual Machine Development Discussion Cc: Pharo-project@lists.gforge.inria.fr Subject: Re: [Pharo-project] [Vm-dev] FW: Debugging Cog crash Yes, the libuuid.so bug would be a likely suspect. If the UUIDPlugin was built as an external library, just delete it and you will probably be good to go. If you need further info, look here: http://bugs.squeak.org/view.php?id=7358 Dave On Fri, Apr 08, 2011 at 07:58:39AM -0400, Schwab,Wilhelm K wrote:

Gratuitous default recipient...

If there is a verbose dump option or other diagnostic efforts that will help, I will do my best to run them and report the results. I am fairly certain the vm is 'Croquet Closure Cog VM [CoInterpreter VMMaker-oscog.54]' (can verify later today), but this happened with an earlier Cog one-click too. There is something about the machine (UUID again?) that is different. I do not have root access to it, but I can get to a terminal. Ubuntu 10.10.

________________________________________ From: Schwab,Wilhelm K Sent: Friday, April 08, 2011 7:44 AM To: Mariano Martinez Peck Subject: RE: [Pharo-project] Debugging Cog crash

Mariano,

I first identified this problem/opportunity a while ago. At the time, there was no log - the vm just died. I can sniff around again as there might be one this time. My question at the time was whether there was something that I could enable to perhaps get more info.

The output from the vm is, and I quote<g> "Segmentation fault". There is no other output. Perhaps it does not get far enough to have a call stack??

Bill

________________________________________ From: Mariano Martinez Peck [marianopeck@gmail.com] Sent: Friday, April 08, 2011 3:42 AM To: Squeak Development Discussion Virtual Machine; Pharo Development Cc: Schwab,Wilhelm K Subject: Re: [Pharo-project] Debugging Cog crash

also...shouldn't be a crash/dump file somewhere?

can you write the output of the console where you invoke the VM into a file ? (using > to redirect)

Cheers

Mariano

On Thu, Apr 7, 2011 at 11:10 PM, Schwab,Wilhelm K <bschwab@anest.ufl.edu<mailto:bschwab@anest.ufl.edu>> wrote: Hello all,

I have an account on an Ubuntu terminal server (at least I think that's what it would be called) running 10.10. The Cog one-click image crashes with "Segmentation fault" (if run from a terminal); the legacy VM seems to run the image nicely on the box. Any ideas? I will happily collect any facts that will be of help, but I need some direction.

Bill

-- Mariano http://marianopeck.wordpress.com