On Mon, Nov 16, 2015 at 8:41 PM, Nicolai Hess <nicolaihess@gmail.com> wrote:


2015-11-16 22:16 GMT+01:00 Mariano Martinez Peck <marianopeck@gmail.com>:


On Mon, Nov 16, 2015 at 5:37 PM, Mariano Martinez Peck <marianopeck@gmail.com> wrote:
Hi guys,

So I found out the exact method that is causing the VM crash. If I compile the method with Opal, it crashes the VM when I execute the code that use that method. If I compile it with old compiler, the code does work correctly.��

I tried comparing both compiled methods compiled from both Compilers and I cannot see real differences. They both seem to have similar (same?) bytecodes, literals, decompiled string, etc. The only difference I see is in #frameSize (old compiler one is 16 while Opal one is 56).��
Any idea what else can I check/compare?��

I also tried in Pharo 5.0 but same results.��

Thanks in advance,��


But the attached cs in there does NOT fixes mine.

You need to:
switch to old compiler in settings

I was doing that via��

Smalltalk compilerClass: XXX.

(I didn't know there was setting).
��
load change set fix_closure_stack_frame_size_computation.1.cs (not fix_closure_stack_frame_size_computation.2.cs!)
switch back to opal
recompile all

Yes, I did that.��
��
But the change set is old, and does not work for recent images (not even for pharo 4.0 release), because there are many
changes for the bytecodegenerator.

Uhhhh. Yes, I saw some. For example, i changed from IRAbstractBytecodeGenerator to IRBytecodeGenerator��

Do you think we can re-create your fix with latest 4.0 or 5.0 so that I can see if the issue was the same?

��

��
I can confirm it's a problem with the number of temp vars defined.�� As soon as I remove any of the temp vars, it works again.

The method is this (a bit ugly, yes) pasted below.
But the key point is: As soon as I remove ANY tempVar����the code starts to work again.

Any clues?

createZacksAccountingRulesFromTable: t1��
| t2 t3 t4 |
t2 := FaUserContextInformation current dbAccessor
db: 'zacks'
getTableAccessorOn: t1
indexOn: nil.
t3 := OrderedCollection new.
t4 := FaFileTranscript named: 'create-zacks-rules.txt'.
FaApplicationDB session
inUnitOfWorkDo: [:t5 |��
| t6 |
t6 := FaUserContextInformation current userDisplayName.
t2
doWithRowDictionaries: [:t7 | (t7 at: 'label')
== FaNullDatum instance
ifFalse: [{{'Annual'. 'ZACKS_A_'}. {'Quarterly'. 'ZACKS_Q_'}}
do: [:t8 |��
| t9 t10 t11 t12 t13 t14 t15 t16 t17 t18 |
t4 crLog: t8 first.
t9 := t8 at: 1.
t16 := t7 at: 'label'.
t18 := t7 at: 'TTM'.
t10 := t7 at: 'quuveKeyEquivalent'.
t12 := (t7 at: 'zacksKey') asUppercase.
t13 := 'ZACKS_' , t12.
t14 := 'ZACKS_Q_' , t12.
t15 := 'ZACKS_A_' , t12.
t11 := (t8 at: 2)
, t12.
t17 := FaAccountingRule new label: t16;
selector: t13 asSymbol;
context: 'Zacks' , t9 , 'Override';
argumentTypesSpecification: '{FaProcessorProxy}';
returnTypeSpecification: 'FaDatedFnSeries';
isReturnValueConstant: true;
action: (self
getZacksDataAtScriptForCache: t11
forZacksKey: t11
fromSet: t9);
comment: (nil
ifNil: [t16]);
isSensitive: true;
definedBy: t6;
ownedBy: t6;
lastEditBy: t6;
yourself.
t5 register: t17.
t3 add: 'Successfully added ' , t17 selector , '/' , t17 context.
t4 crLog: t3 last]]]].
^ t3









��

On Mon, Nov 16, 2015 at 2:48 PM, Mariano Martinez Peck <marianopeck@gmail.com> wrote:


On Mon, Nov 16, 2015 at 2:48 PM, Mariano Martinez Peck <marianopeck@gmail.com> wrote:


On Mon, Nov 16, 2015 at 1:07 PM, Nicolai Hess <nicolaihess@gmail.com> wrote:
��
Hi Mariano, if you know the method that may cause this crash can you check
if it works if you recompile this method with the old compiler,
maybe this issue is responsible - wrong stack frame size :
13854 frameSize calculated wrongly for #lineSegmentsDo:


Hi Nicolai,

Thanks for the pointer. I tried with your fix and I still get the same results (even after recompiling).
However...if I swap back to old Compiler rather than OpalCompiler and I recompile everything, then I do not have anymore the crash.��
So it's definitively something related to Opal compilation, and probably, related to closures compilation.��
I will see if I find other opal issues opened in 4.0.

Thanks!
��


2015-11-16 17:00 GMT+01:00 Mariano Martinez Peck <marianopeck@gmail.com>:
��
Hi guys,

I am debugging a Pharo VM crash I am having and I cannot figure out what it is exactly. I suspect it might be related to block closures compilation but I am not sure. I have a reproducible crash test under Pharo 4.0 and OSX.��

I built a VM in debug mode and I run it via gdb. This is the kind of info I am able to see:

Program received signal SIGSEGV, Segmentation fault.
0x000ab66b in updatePointersInRangeFromto (memStart=924623948, memEnd=928201420) at /Users/mariano/Pharo/git/pharo-vm/src/vm/gcc3x-cointerp.c:40444
40444 && (((longAt(fieldOop)) & MarkBit) != 0)) {
(gdb) call printAllStacks()
Process 0x30e228c4 priority 40
0xbffb2e10 M FaAction class>block: 0x20ebb104: a(n) FaAction class
0xbffb2e30 M BlockClosure(FaMemoryStoreSession)>register: 0x371d0968: a(n) BlockClosure
0xbffb2e4c M INVALID RECEIVER>register: 0x371cfd54: a(n) bad class

(callerContextOrNil == (nilObject())) || (isContext(callerContextOrNil)) 48626
0x3721e1f0 is not a context
0x371c34b4 is not a context

And another crash:

Program received signal SIGSEGV, Segmentation fault.
0x000ab66b in updatePointersInRangeFromto (memStart=924677864, memEnd=928262300) at /Users/mariano/Pharo/git/pharo-vm/src/vm/gcc3x-cointerp.c:40444
40444 && (((longAt(fieldOop)) & MarkBit) != 0)) {
(gdb) call printAllStacks()
Process 0x30e228c4 priority 40
0xbffb2de0 M INVALID RECEIVER>initialize 0x3722b9a0: a(n) bad class
0xbffb2df8 M FaAction class(Behavior)>new 0x20ebb104: a(n) FaAction class
0xbffb2e10 M FaAction class>block: 0x20ebb104: a(n) FaAction class
0xbffb2e30 M INVALID RECEIVER>register: 0x371ddee0: a(n) bad class
0xbffb2e4c M INVALID RECEIVER>register: 0x371dd328 is in old space

(callerContextOrNil == (nilObject())) || (isContext(callerContextOrNil)) 48626
0x3722b750 is not a context
[New Thread 0x1b43 of process 5886]
[New Thread 0x1d2f of process 5886]
[New Thread 0x1f07 of process 5886]
[New Thread 0x1e07 of process 5886]

>From what I can see in #printActivationNameFor: aMethod receiver: anObject isBlock: isBlock firstTemporary: maybeMessage
It looks like if the memory address is not an OOP, nor forwarding pointer nor...

It also seems like the above stack I can get is not the real cause but a side effect that makes GC to crash (#updatePointersInRangeFromto)

As said, I have a way to reproduce the crash, and I already have the VM compiled in debug and gdb running. I can also attach the full output of the gdb stack.��

BTW.... in the output of the gdb I see lots of printings like:

(numStack + ReceiverIndex) < (lengthOf(theContext)) 45421
(ReceiverIndex + contextSize) < (lengthOfbaseHeaderformat(oop, header2, fmt)) 40416


Any pointer is appreciated.

Thanks!

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Mariano
http://marianopeck.wordpress.com