[Vm-dev] Reproducible VM crash with excessive garbage collection

Ben Coman btc at openInWorld.com
Mon Nov 17 10:33:08 UTC 2014

Max Leske wrote:
> ------------------------------------------------------------------------
> Hi.
> I may have discovered a bug in the PharoVM (stable and latest), which 
> may have been around for at least two years (I had a very similiar 
> situation about two years ago with Fuel).
> I have a test that fails when a particular method contains “3 
> timesRepeat: [ Smalltalk garbageCollect ]”. In order to be sure that it’ 
> not the #timesRepeat message that’s causing the crash, I replaced that 
> with multiple “Smalltalk garbageCollect” sends.
> The test I’m talking about ObsoleteTest>>testFixObsoleteSharedPools. To 
> make the test crash the VM, simply add a couple of garbageCollects at 
> the end of SmalltalkImage>>fixObsoleteSharedPools. I tried to come up 
> with a little script to demonstrate the issue but I can only reproduce 
> the problem with Nautilus (which makes me suspect that the problem is 
> related to Nautilus).
> Steps to reproduce:
> 1. get a fresh image and  the latest vm:
> curl get.pharo.org/40+vmLastest <http://get.pharo.org/40+vmLastest> | 
> bash && ./pharo-ui Pharo.image
> 2. open the class browser and navigate to 
> SmalltalkImage>>fixObsoleteSharedPools
> 3. Append ten “self garbageCollect” statements to the method.
> 4. navigate to ObsoleteTest>>testFixObsoleteSharedPools and click on the 
> test runner icon to the left of the method name.
> I can reproduce this with the Mac VM (OS X 10.10) as well as with the 
> linux VM (Ubuntu 12.04.1).
> I’ve opened an issue for 
> this: https://pharo.fogbugz.com/f/cases/14478/Reproducible-VM-crash-with-excessive-garbage-collection
> Cheers,
> Max

I reported similar here..

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