Pharo Save backtrace.

3/home/deech/Pharo/vms/70-x64/lib/pharo/5.0-201806281256/pharo
Pharo VM version: 5.0-201806281256  Thu Jun 28 13:04:44 UTC 2018 gcc 4.8 [Production Spur 64-bit VM]
Built from: CoInterpreter VMMaker.oscog-eem.2401 uuid: 29232e0e-c9e3-41d8-ae75-519db862e02c Jun 28 2018
With: StackToRegisterMappingCogit VMMaker.oscog-eem.2401 uuid: 29232e0e-c9e3-41d8-ae75-519db862e02c Jun 28 2018
Revision: VM: 201806281256 https://github.com/OpenSmalltalk/opensmalltalk-vm.git Date: Thu Jun 28 14:56:30 2018 CommitHash: a8a1dc1 Plugins: 201806281256 https://github.com/OpenSmalltalk/opensmalltalk-vm.git
Build host: Linux travis-job-46342785-b1c1-4811-8c3c-9b2a88ae7ecc 4.4.0-101-generic #124~14.04.1-Ubuntu SMP Fri Nov 10 19:05:36 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
plugin path:  [default: /home/deech/Pharo/vms/70-x64/lib/pharo/5.0-201806281256/]


C stack backtrace & registers:
	rax 0x4ae4da00 rbx 0x4ae4d890 rcx 0x4ae4dab8 rdx 0x4ae4d948
	rdi 0x4ae4d668 rsi 0x4ae4d668 rbp 0x4ae4d7d8 rsp 0x4ae4db70
	r8  0x4ae4d0a8 r9  0x4ae4d160 r10 0x4ae4d218 r11 0x4ae4d2d0
	r12 0x4ae4d388 r13 0x4ae4d440 r14 0x4ae4d4f8 r15 0x4ae4d5b0
	rip 0x4ae4dc28
*[0x7ffe4ae4dc28]
/home/deech/Pharo/vms/70-x64/lib/pharo/5.0-201806281256/pharo[0x41b017]
/home/deech/Pharo/vms/70-x64/lib/pharo/5.0-201806281256/pharo[0x41ca5e]
/lib/libpthread.so.0(+0x123c0)[0x7f4444caa3c0]
[0x7f442ccf86d0]
[0x0]


Smalltalk stack dump:
    0x7ffe4ae694c0 M >primShutdownPlatform 0x85450f0: a(n) 
    0x7ffe4ae69518 I FFICalloutAPI>function:module: 0x2254990: a(n) FFICalloutAPI
    0x7ffe4ae69568 I (Object)>ffiCall: 0x85450f0: a(n) 
    0x7ffe4ae695b0 I >primShutdownPlatform 0x85450f0: a(n) 
    0x7ffe4ae695e0 M [] in >stop 0x85450f0: a(n) 
    0x7ffe4ae69620 M BlockClosure>ensure: 0x223f728: a(n) BlockClosure
    0x7ffe4ae69668 I >stop 0x85450f0: a(n) 
    0x7ffe4ae696a8 I >shutDown: 0x85450f0: a(n) 
    0x7ffe4ae696e0 M ClassSessionHandler>shutdown: 0x88592b0: a(n) ClassSessionHandler
    0x7ffe4ae69720 M [] in WorkingSession>runShutdown: 0x53a09f8: a(n) WorkingSession
    0x7ffe4ae69768 M [] in WorkingSession>runList:do: 0x53a09f8: a(n) WorkingSession
    0x7ffe4ae69798 M BlockClosure>on:do: 0x223f418: a(n) BlockClosure
    0x7ffe4ae697e0 M [] in WorkingSession>runList:do: 0x53a09f8: a(n) WorkingSession
    0x7ffe4ae69828 M Array(SequenceableCollection)>do: 0x21d0ad0: a(n) Array
    0x7ffe4ae69870 I WorkingSession>runList:do: 0x53a09f8: a(n) WorkingSession
    0x7ffe4ae698c0 I WorkingSession>runShutdown: 0x53a09f8: a(n) WorkingSession
    0x7ffe4ae69908 I WorkingSession>stop: 0x53a09f8: a(n) WorkingSession
    0x7ffe4ae69960 I SessionManager>launchSnapshot:andQuit: 0x2670390: a(n) SessionManager
    0x7ffe4ae83280 I SessionManager>snapshot:andQuit: 0x2670390: a(n) SessionManager
    0x7ffe4ae832e0 I [] in SmalltalkImage>snapshot:andQuit: 0x260a918: a(n) SmalltalkImage
    0x7ffe4ae83328 I CurrentExecutionEnvironment class>activate:for: 0x26023c0: a(n) CurrentExecutionEnvironment class
    0x7ffe4ae83378 I DefaultExecutionEnvironment(ExecutionEnvironment)>beActiveDuring: 0x25f7d40: a(n) DefaultExecutionEnvironment
    0x7ffe4ae833c0 I DefaultExecutionEnvironment class>beActiveDuring: 0x26029c8: a(n) DefaultExecutionEnvironment class
    0x7ffe4ae83408 I SmalltalkImage>snapshot:andQuit: 0x260a918: a(n) SmalltalkImage
    0x7ffe4ae83448 M [] in WorldState class>saveAndQuit 0x2cc1230: a(n) WorldState class
    0x7ffe4ae83488 M BlockClosure>ensure: 0x218b3e0: a(n) BlockClosure
    0x7ffe4ae834c8 M CursorWithMask(Cursor)>showWhile: 0x2c8f368: a(n) CursorWithMask
    0x7ffe4ae83500 M WorldState class>saveAndQuit 0x2cc1230: a(n) WorldState class
    0x7ffe4ae83540 M [] in ToggleMenuItemMorph(MenuItemMorph)>invokeWithEvent: 0xa497f70: a(n) ToggleMenuItemMorph
    0x7ffe4ae83580 M BlockClosure>ensure: 0x218b220: a(n) BlockClosure
    0x7ffe4ae835c0 M CursorWithMask(Cursor)>showWhile: 0x2c8f640: a(n) CursorWithMask
    0x7ffe4ae83600 M ToggleMenuItemMorph(MenuItemMorph)>invokeWithEvent: 0xa497f70: a(n) ToggleMenuItemMorph
    0x7ffe4ae83648 I ToggleMenuItemMorph(MenuItemMorph)>mouseUp: 0xa497f70: a(n) ToggleMenuItemMorph
    0x7ffe4ae83680 M ToggleMenuItemMorph(MenuItemMorph)>handleMouseUp: 0xa497f70: a(n) ToggleMenuItemMorph
    0x7ffe4ae836b8 M MouseButtonEvent>sentTo: 0x2165998: a(n) MouseButtonEvent
    0x7ffe4ae836f0 M ToggleMenuItemMorph(Morph)>handleEvent: 0xa497f70: a(n) ToggleMenuItemMorph
    0x7ffe4ae83750 M MorphicEventDispatcher>dispatchDefault:with: 0x2d02ab8: a(n) MorphicEventDispatcher
    0x7ffe4ae83790 M MorphicEventDispatcher>handleMouseUp: 0x2d02ab8: a(n) MorphicEventDispatcher
    0x7ffe4ae837c8 M MouseButtonEvent>sentTo: 0x2165998: a(n) MouseButtonEvent
    0x7ffe4ae83808 M [] in MorphicEventDispatcher>dispatchEvent:with: 0x2d02ab8: a(n) MorphicEventDispatcher
    0x7ffe4ae83848 M BlockClosure>ensure: 0x2165aa0: a(n) BlockClosure
    0x7ffe4ae83880 M MorphicEventDispatcher>dispatchEvent:with: 0x2d02ab8: a(n) MorphicEventDispatcher
    0x7ffe4ae838c0 M ToggleMenuItemMorph(Morph)>processEvent:using: 0xa497f70: a(n) ToggleMenuItemMorph
    0x7ffe4ae83928 M MorphicEventDispatcher>dispatchDefault:with: 0x2d02ab8: a(n) MorphicEventDispatcher
    0x7ffe4ae83968 M MorphicEventDispatcher>handleMouseUp: 0x2d02ab8: a(n) MorphicEventDispatcher
    0x7ffe4ae77368 M MouseButtonEvent>sentTo: 0x2164618: a(n) MouseButtonEvent
    0x7ffe4ae773a8 M [] in MorphicEventDispatcher>dispatchEvent:with: 0x2d02ab8: a(n) MorphicEventDispatcher
    0x7ffe4ae773e8 M BlockClosure>ensure: 0x2164720: a(n) BlockClosure
    0x7ffe4ae77420 M MorphicEventDispatcher>dispatchEvent:with: 0x2d02ab8: a(n) MorphicEventDispatcher
    0x7ffe4ae77460 M MenubarMenuMorph(Morph)>processEvent:using: 0x98ca918: a(n) MenubarMenuMorph
    0x7ffe4ae774a0 M MenubarMenuMorph(Morph)>processEvent: 0x98ca918: a(n) MenubarMenuMorph
    0x7ffe4ae774d8 M MenubarMenuMorph(MenuMorph)>handleFocusEvent: 0x98ca918: a(n) MenubarMenuMorph
    0x7ffe4ae77528 M [] in HandMorph>sendFocusEvent:to:clear: 0x2d07258: a(n) HandMorph
    0x7ffe4ae77558 M BlockClosure>on:do: 0x21644f0: a(n) BlockClosure
    0x7ffe4ae775b0 M WorldMorph(PasteUpMorph)>becomeActiveDuring: 0x2d07368: a(n) WorldMorph
    0x7ffe4ae775f8 M HandMorph>sendFocusEvent:to:clear: 0x2d07258: a(n) HandMorph
    0x7ffe4ae77648 M HandMorph>sendEvent:focus:clear: 0x2d07258: a(n) HandMorph
    0x7ffe4ae77690 M HandMorph>sendMouseEvent: 0x2d07258: a(n) HandMorph
    0x7ffe4ae776e8 M HandMorph>handleEvent: 0x2d07258: a(n) HandMorph
    0x7ffe4ae77740 M HandMorph>processEventsFromQueue: 0x2d07258: a(n) HandMorph
    0x7ffe4ae77778 M HandMorph>processEvents 0x2d07258: a(n) HandMorph
    0x7ffe4ae777a8 M [] in WorldState>doOneCycleNowFor: 0x2d153f0: a(n) WorldState
    0x7ffe4ae777f0 M Array(SequenceableCollection)>do: 0x2d30858: a(n) Array
    0x7ffe4ae77828 M WorldState>handsDo: 0x2d153f0: a(n) WorldState
    0x7ffe4ae77860 M WorldState>doOneCycleNowFor: 0x2d153f0: a(n) WorldState
    0x7ffe4ae77898 M WorldState>doOneCycleFor: 0x2d153f0: a(n) WorldState
    0x7ffe4ae778d0 M WorldMorph>doOneCycle 0x2d07368: a(n) WorldMorph
    0x7ffe4ae77900 M WorldMorph class>doOneCycle 0x2cc10f8: a(n) WorldMorph class
    0x7ffe4ae77930 M [] in MorphicUIManager>spawnNewProcess 0x53cc4e0: a(n) MorphicUIManager
    0x7ffe4ae77970 I [] in BlockClosure>newProcess 0x1d77530: a(n) BlockClosure