[squeak-dev] Crash

Jörg Belger unique75 at web.de
Fri Feb 11 17:09:57 UTC 2022


Hi Eliot,

I did that, I used a x64 Native shell from Visual Studio. But it does neither work with 2022 nor with 2017, I deinstalled 2022 today and installed 2017, same result. It shows me only the first line what the script prints out. I have currently no access to my computer, I am not at home. But it shows only that DEBUG is started, just one line, nothing more.

Maybe I need to have a look into the batch files, I am afraid of that :-)

Jörg

> Am 11.02.2022 um 18:03 schrieb Eliot Miranda <eliot.miranda at gmail.com>:
> 
> 
> 
> On Fri, Feb 11, 2022 at 12:51 AM Jörg Belger <unique75 at web.de <mailto:unique75 at web.de>> wrote:
> I was not able so far to compile a VM. Yesterday I installed Cygwin with standard settings and MS VisualStudio, but Version 2022, maybe I need 2017. I do all the things described in the HowToBuild, but when I do ../common/MAKEDEBUG.bat I get only the one output line that it does the DEBUG, but the script immediately stops, nothing happens.
> 
> You must run ..\common\MAKEDEBUG.BAT in an MSVC shell window, not a Cygwin window.  Furst do ..\common\SETPATH.BAT, then run MAKEDEBUG.BAT
> 
> I used simply the latest debug build and attached it to VisualStudio. This is what I get, which means, exception raised, access violation at
> 
> Ausnahme ausgelöst bei 0x00007FF75DE1878B in Squeak.exe: 0xC0000005: Zugriffsverletzung beim Lesen an Position 0x00005AF973234C20.
> 
>> Am 10.02.2022 um 21:12 schrieb Eliot Miranda <eliot.miranda at gmail.com <mailto:eliot.miranda at gmail.com>>:
>> 
>> 
>>> On Feb 10, 2022, at 12:07 PM, Jörg Belger <unique75 at web.de <mailto:unique75 at web.de>> wrote:
>>> 
>>> There is no crash.dmp file
>> 
>> Then the only thing I can suggest is building a VM using the MSCV tool chain (see MSVC in opensmalltalk-vm/building/win64x64/HowToBuild), running that VM in the VisualStudio debugger, and seeing if that is more informative.
>> 
>>> 
>>>> Am 10.02.2022 um 20:58 schrieb Eliot Miranda <eliot.miranda at gmail.com <mailto:eliot.miranda at gmail.com>>:
>>>> 
>>>> HI Jörg,
>>>> 
>>>> On Wed, Feb 9, 2022 at 11:08 PM Jörg Belger <unique75 at web.de <mailto:unique75 at web.de>> wrote:
>>>> Hi Dave,
>>>> 
>>>> I mean with „crash“ the Squeak process is exited unexpectedly, it is just fully gone away. Maybe it happens for me earlier because if have a 32 GB machine and I do not have so much swapping. It is not a hanging/locking/unresponsivness, it is a real crash :-)
>>>> 
>>>> Is there a crash.dmp file?  If so, can you post it? It should be in the same directory as either the image or the vm.
>>>> 
>>>> Here are my machine details:
>>>> 
>>>> Gerätename      timemachine
>>>> Prozessor       AMD Ryzen 9 3900X 12-Core Processor               3.80 GHz
>>>> Installierter RAM       32,0 GB
>>>> Geräte-ID       F6FA897B-DDB1-44D6-9BF3-8BD1110AA754
>>>> Produkt-ID      00326-10048-08575-AA867
>>>> Systemtyp       64-Bit-Betriebssystem, x64-basierter Prozessor
>>>> Stift- und Toucheingabe Für diese Anzeige ist keine Stift- oder Toucheingabe verfügbar.
>>>> 
>>>> Edition Windows 10 Home
>>>> Version 20H2
>>>> Installiert am  ‎23.‎03.‎2021
>>>> Betriebssystembuild     19042.1526
>>>> Leistung        Windows Feature Experience Pack 120.2212.4170.0
>>>> 
>>>> 
>>>> > Am 10.02.2022 um 04:27 schrieb David T. Lewis <lewis at mail.msen.com <mailto:lewis at mail.msen.com>>:
>>>> > 
>>>> > On Thu, Feb 03, 2022 at 10:30:49PM +0100, J??rg Belger wrote:
>>>> >> This leads to an image/VM crash too
>>>> >> 
>>>> >>      | oc |
>>>> >>      oc := OrderedCollection new.
>>>> >>      400000000 timesRepeat: [oc add: Object new]
>>>> >> 
>>>> >> This here is working for me:
>>>> >> 
>>>> >>      | oc |
>>>> >>      oc := OrderedCollection new: 400000000.
>>>> >>      400000000 timesRepeat: [oc add: Object new]
>>>> >> 
>>>> >> This here is working too for me:
>>>> >> 
>>>> >>      | oc |
>>>> >>      oc := OrderedCollection new.
>>>> >>      400000000 timesRepeat: [oc add: 1]
>>>> >> 
>>>> >> It seems there is possibly a memory problem in the VM.
>>>> >> 
>>>> >> 
>>>> > 
>>>> > I have tried to reproduce this on my PC with 8GB memory. I was not able
>>>> > to crash the VM but it certainly locked my system up in swapping as the
>>>> > test continued to use memory. Eventually I ran out of time and patience
>>>> > and killed the VM process.
>>>> > 
>>>> > If there is an actual VM crash involved then maybe there is a bug. But
>>>> > if you are seeing your Squeak image is just stalling out, then nothing
>>>> > is wrong except for a matter of basic arithmetic.
>>>> > 
>>>> > You are trying to allocate 400,000,000 individual objects, each of which
>>>> > requires 16 bytes of memory in the object memory, and you are storing
>>>> > each of those objects using an 8 byte object pointer to the object in
>>>> > the ordered collection. So just for the raw storage you are going to
>>>> > need for those "Object new" things, you need 400,000,000 * (16 + 8)
>>>> > = 9,600,000,000 bytes. On top of that you are putting the objects into
>>>> > an OrderedCollection that does not know that you are going to ask it
>>>> > to hold 400,000,000 object pointers, so it has to keep extending itself
>>>> > as the test proceeds.
>>>> > 
>>>> > When I tried to run this on my PC with a mere eight GB of real memory,
>>>> > the operating system had to start swapping out real memory make room
>>>> > for all of that activity. And every time the OrderedCollection needs
>>>> > to extend its space, it is accessing real memory that probably got
>>>> > swapped out to disk to make room in the 8GB of real memory space, so
>>>> > basically it puts the system into a death spiral that locks up the
>>>> > Squeak image (and pretty much everything else on my computer).
>>>> > 
>>>> > So I am able to reproduce the locked up image (as I would expect on my
>>>> > PC with only 8GB memory) but I have not been able to reproduce a crash.
>>>> > 
>>>> > Just to clarify, are you describing a "crash" in which the actual
>>>> > Squeak VM process exited unexpectedly, or was it a "crash" in the
>>>> > sense of the the image locking up and becoming unresponsive? If the
>>>> > latter, then most likely nothing is wrong.
>>>> > 
>>>> > Dave
>>>> > 
>>>> > 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> -- 
>>>> _,,,^..^,,,_
>>>> best, Eliot
>>> 
>>> 
>> 
> 
> 
> 
> 
> -- 
> _,,,^..^,,,_
> best, Eliot

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