SstOSObjectManager>>#freeBuffer: throws exceptions

[Marten Feldtmann]

Very often - when I save my development image (including Seaside, SST, etc) and restart it later again - I get exceptions from that method., because the method tries to free external memory, which is not available any more (general exception fault is thrown).

The best way would be to free potential objects when starting this image (with exception handling) or to initialize this object at startup. I do not think, that there can be any valid OSObjects at startup of an image.

[John O'Keefe]

Marten -

 

What version of VA Smalltalk do you see this happening in (and what platform)? I know there used to be a problem with #freeBuffer:, but I thought it got fixed.

 

John

[Marten Feldtmann]

That's for 8.5 (under Windows), but I've seen this under Linux also - and I think it was also under 8.03

[jtu...@objektfabrik.de]

Hi,

I got it today. For the first time. There's nothing helpful the debugger could tell me about it, but OSUInt8(OSPtr)>>#free fails due to GPF during processing of the finalizeQueue...

Joachim

[jtu...@objektfabrik.de]

sorry, forgot to mention: VAST 8.5 on Win XP SP3.

[jtu...@objektfabrik.de]

I now see it almost every time I start an Image in which there was a running WASstAdaptor before the image got saved.

VAST 8.5 on Win 7, Win XP SP3 and ubuntu 11.10.

A second or two after the image opened, the debugger pops up. You can terminate the process without any problems and continue to work.

Here's the stack trace, but I guess it's not really helpful:

Debugger Stack Trace Report:

Error String: 'Primitive failed in: OSPtr>>#free due to General protection fault'

Resumable: false

Process

Name: Idle 20:27:36

Process State: suspended

Priority: 1

GPF Information:

Handler=0xf74a79ac

vmState=0x00000002

vmError=0x00000034

Signal=0x0000000b

GS=0x00000063

FS=0x00000000

ES=0x0000002b

DS=0x0000002b

EDI=0x00000002

ESI=0xf4d35ed3

EBP=0xfff7ef38

ESP=0xfff7ef0c

EAX=0x00000000

EBX=0xf72c9ff4

ECX=0x09c49af8

EDX=0xf434c1d0

TRAPNO=0x0000000e

ERR=0x00000004

EIP=0xf71c688e

CS=0x00000023

EFL=0x00210202

UESP=0xfff7ef0c

SS=0x0000002b

Executing in: OSUInt8(OSPtr)>>#free

System Configuration Dump

Copyright:

VA Smalltalk V8.5; Image: 8.5 [194]

VM Timestamp: 4.0,(NC) 8/17/2011 (82)

(C) Copyright Instantiations 1994, 2011.  All rights reserved.

(C) Copyright International Business Machines Corp. 1994, 2006.  All rights reserved.

Time:  21:17:26

Date:  07.03.2012

Platform:

Virtual machine:  ES

Bytecode version:  4.0

Manager version:  4.00

'OS' subsystem:  'UNIX'

'CLIM' subsystem:  'ES'

'CP' subsystem:  'X'

'CLDT' subsystem:  'ES'

'CFS' subsystem:  'POSIX'

'SCI' subsystem:  'UNIX'

'CW' subsystem:  'MOTIF'

'CPM' subsystem:  'ES'

'CG' subsystem:  'X'

Current user:  Joachim Tuchel

Connected Library:

Pathname:  ####

Library version:  6

Size of library:  203476688 bytes

Has consistent EOF:  true

Acquire read locks:  false

Single user mode:  false

Server address:  '####'

Library Access:

Host system name:  None

Use release lock mode:  true

Native primitives library:  libemntv50

Emsrv primitives library:  libemsrv50

Memory:

Total allocation:  37664300 bytes

Available:  4043912 bytes

Fixed Space:  33948 bytes

New Space:  1839192 bytes

Old Space:  2204108 bytes

=============<STACK TRACE BEGINS>============

[] in <optimized block>(ExceptionalEvent class)>>#initializeSystemExceptions

signal=Signal on Exception: (ExError) An error has occurred.

Signal>>#evaluate:

self=Signal on Exception: (ExError) An error has occurred.

aBlock=[] in ExceptionalEvent class>>#initializeSystemExceptions

Signal>>#evaluateDefaultHandler:

self=Signal on Exception: (ExError) An error has occurred.

aBlock=[] in ExceptionalEvent class>>#initializeSystemExceptions

ExceptionalEvent>>#applyDefaultHandler:

self=Exception: (ExError) An error has occurred.

aSignal=Signal on Exception: (ExError) An error has occurred.

exception=Exception: (ExError) An error has occurred.

ExceptionalEvent>>#signalFor:

self=Exception: (ExError) An error has occurred.

aSignalOrExceptionSelector=Signal on Exception: (ExError) An error has occurred.

handler=nil

ExceptionalEvent>>#signalWithArguments:

self=Exception: (ExError) An error has occurred.

arguments=('Primitive failed in: OSPtr>>#free due to General protection fault')

ExceptionalEvent>>#signalWith:

self=Exception: (ExError) An error has occurred.

arg1='Primitive failed in: OSPtr>>#free due to General protection fault'

OSUInt8(Object)>>#error:

self=*OSUInt8 {16r09C49AF8}

aString='Primitive failed in: OSPtr>>#free due to General protection fault'

OSUInt8(Object)>>#primitiveFailed:withArgument:backUp:

self=*OSUInt8 {16r09C49AF8}

errorCode=52

argument=-1

backUp=1

OSUInt8(Object)>>#primitiveFailed

self=*OSUInt8 {16r09C49AF8}

OSUInt8(OSPtr)>>#free

self=*OSUInt8 {16r09C49AF8}

SstOSObjectManager>>#freeBuffer:

self=a SstOSObjectManager

anOSObject=*OSUInt8 {16r09C49AF8}

EsWeakSet>>#finalizedSlot:removedObject:

self=EsWeakSet()

index=1

anObject=*OSUInt8 {16r09C49AF8}

EsWeakArray>>#finalizedSlot:removedObject:

self=(nil nil ... recursive reference to EsWeakArray ... ... recursive reference to EsWeakArray ... ... recursive reference to EsWeakArray ... nil ... recursive reference to EsWeakArray ... ... recursive reference to EsWeakArray ... ... recursive reference to EsWeakArray ... ... recursive reference to EsWeakArray ... ... recursive reference to EsWeakArray ...)

slotIndex=2

anObject=*OSUInt8 {16r09C49AF8}

[] in <optimized block>(ProcessorScheduler)>>#finalizeCycle

finalizeQueue=an EsQueue()

EsCompactBlockContextTemplate(Block)>>#critical

self=[] in ProcessorScheduler>>#finalizeCycle

ProcessorScheduler>>#finalizeCycle

self=a ProcessorScheduler

[] in AbtWindowSystemStartUp class(EsImageStartUp class)>>#idleProcess

self=AbtWindowSystemStartUp

[] in Process>>#executeBlock:withArguments:

self=Process:Idle 20:27:36{suspended,1}

aBlock=[] in EsImageStartUp class>>#idleProcess

args=()

Process>>#executeBlock:withArguments:

self=Process:Idle 20:27:36{suspended,1}

aBlock=[] in EsImageStartUp class>>#idleProcess

args=()

Process>>#newProcessOn:stackSize:withArguments:named:

self=Process:Idle 20:27:36{suspended,1}

aBlock=[] in EsImageStartUp class>>#idleProcess

stackSize=1024

args=()

procName='23569'

==============<STACK TRACE ENDS>=============

[jtu...@objektfabrik.de]

Hi again,

is this one fixed in 8.5.1?

A packaged image should ideally not be affected by this, because there should never be a saved open socket or http session in it, but if there is for some reason, this might crash a server image right after its start.

Joachim

[John O'Keefe]

Marten -

 

The problem is caused by stale entries in the finalization queue when the image is started.  I will be changing the EmSystemConfiguration>>#initializeVM method to clear the finalization queue for V8.5.2.

 

John

On Friday, October 7, 2011 3:03:10 AM UTC-4, Marten Feldtmann wrote:

Very often - when I save my development image (including Seaside, SST, etc) and restart it later again - I get exceptions from that method., because the method tries to free external memory, which is not available any more (general exception fault is thrown).

The best way would be to free potential objects when starting this image (with exception handling) or to initialize this object at startup. I do not think, that there can be any valid OSObjects at startup of an image.