Esteban here is the script to systematically reproduce it.

wget -O - http://get.pharo.org/30+vmLatest | bash

Close all the nautilus windows. Gofer new smalltalkhubUser: 'Pharo' project: 'SystemConfigurations'; version: 'UnReloader-StephaneDucasse.25'; load. UnReloader new unload On 09 Mar 2014, at 22:10, Pharo4Stef <pharo4Stef@free.fr> wrote:

Hi

We already experienced this with Pavel in December.

Once I loaded UnReloader from SystemConfigurations from STHUB/Pharo and I run unload I crash systematically the latest vm obtain with

wget -O - http://get.pharo.org/30+vmLatest | bash

the method crashing the system is

checkState "self new checkState" | difference |

difference := SystemNavigation default allUnimplementedCalls copyWithoutAll: unimplementedCalls. difference ifNotEmpty: [ self log nextPutAll: 'new unimplemented calls: '; cr; nextPutAll: difference asString; cr.].

difference := (SystemNavigation default obsoleteClasses collect: #name) asSet copyWithoutAll: obsoleteClasses. difference ifNotEmpty: [ self log nextPutAll: 'new obsoleteClasses:'; cr; nextPutAll: difference asString; cr].

difference := (Undeclared collect: #name) asSet copyWithoutAll: undeclared. difference ifNotEmpty: [ self log nextPutAll: 'new undeclared: '; cr; nextPutAll: difference asString; cr].

unimplementedCalls := SystemNavigation default allUnimplementedCalls. obsoleteClasses := (SystemNavigation default obsoleteClasses collect: #name) asSet. undeclared := (Undeclared collect: #name) asSet.

Now executing the expressions one by one once the tools have been removed does not crash.

Stef