[Vm-dev] [squeak-dev] Squeak5.3 linux ARMv6 segfaults on startup

[Nicolas Cellier]

Hi Eliot,
a few mails above in the thread, it seems to be in #stepToNextBezier

Le lun. 27 avr. 2020 à 20:01, Eliot Miranda <eliot.miranda at gmail.com> a
écrit :

>
> Hi Nicolas,
>
> On Sun, Apr 26, 2020 at 6:27 PM Eliot Miranda <eliot.miranda at gmail.com>
> wrote:
>
>>
>>
>> On Apr 26, 2020, at 1:50 PM, Nicolas Cellier <
>> nicolas.cellier.aka.nice at gmail.com> wrote:
>>
>> 
>> and https://source.squeak.org/VMMaker/VMMaker.oscog-nice.2732.diff
>>
>>
> Alas no.  The bug is definitely still there in both 32-bit and 64-bits in
> the trunk of VMMaker under the simulator.  Run with your favorite trunk
> image and in the simulation open up an About Squeak SystemReporter. The
> good news is that it is *only* in the simulator on 64-bits.  On the real VM
> on my Mac I see no problems.
>
> Nicolas, can you point me to the (un)signed shifts that had to be changed
> in Slang to fix the problem in the real VM?  That should make it trivial to
> fix the simulation.  I ask because there are no senders of >>> in
> BitBltSimulation so I don't see an obvious place to focus on.
>
>
>
>> Thanks!!
>>
>>
>> Le dim. 26 avr. 2020 à 22:48, Nicolas Cellier <
>> nicolas.cellier.aka.nice at gmail.com> a écrit :
>>
>>> Hi Eliot,
>>> already fixed by
>>> https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/3fa41faef52a157954d706aa5305e756f0f23228
>>>
>>> Le dim. 26 avr. 2020 à 22:44, Eliot Miranda <eliot.miranda at gmail.com> a
>>> écrit :
>>>
>>>> Hi Tim,
>>>>
>>>> On Sun, Mar 22, 2020 at 2:50 PM Eliot Miranda <eliot.miranda at gmail.com>
>>>> wrote:
>>>>
>>>>> Hi Bruce,
>>>>>
>>>>> On Mar 22, 2020, at 8:31 AM, Bruce O'Neel <bruce.oneel at pckswarms.ch>
>>>>> wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> Good news, playing with
>>>>>
>>>>> --enable-fast-bitblt
>>>>>
>>>>>
>>>>> and
>>>>>
>>>>> --disable-fast-bitblt
>>>>>
>>>>>
>>>>> does work in that it builds a working VM.
>>>>>
>>>>> Good news/bad news, it does not change the font problem.  So that's
>>>>> not the problem.
>>>>>
>>>>>
>>>>> Great news.  We now know it is an X11 problem and can stop worrying
>>>>> about the fast BitBLT code.  Thanks.
>>>>>
>>>>
>>>> Looks like the problem, or at least a version of the problem, is
>>>> nothing to do with X11.  If I open an About Squeak System Reporter in the
>>>> simulator (64-bits x64) I see the fixed pitch font corruption we saw on X11
>>>> on ARM.  So it looks tile the issue is actually in BitBlt itself.
>>>>
>>>> <SysRepFixedPitch.png>
>>>>
>>>>
>>>>>
>>>>> cheers
>>>>>
>>>>> bruce
>>>>>
>>>>> *21 March 2020 01:07 tim Rowledge <tim at rowledge.org
>>>>> <tim at rowledge.org>> wrote:*
>>>>>
>>>>>
>>>>>
>>>>> > On 2020-03-20, at 6:16 AM, Bruce O'Neel wrote:
>>>>> >
>>>>> >
>>>>> > I specialize in ridiculous. Good news, I guess, is that I dug up a
>>>>> monitor, and, walked it downstairs with a keyboard and mouse and attached
>>>>> it. The effect with the BitstreamVeraSans and ComicSans fonts are the same.
>>>>> Maybe it likes serfed fonts?
>>>>>
>>>>> I'm completely baffled by this. I don't get this effect with any ARM
>>>>> vm that I have that actually runs, with any image I have.
>>>>>
>>>>> >
>>>>> > So that means that it is not some funky X11 over the wire problem
>>>>> with the Mac and Windows X11 servers problem. That's good.
>>>>>
>>>>> Guess so, though it just makes life weirder.
>>>>>
>>>>> >
>>>>> > I have no idea then why. Are these fonts part of the image? Is it
>>>>> some funky binary format that for some reason Coq is mis-reading?
>>>>>
>>>>> Yes, the font glyphs are in-image. We've been using these ones for
>>>>> goodness knows how many years.
>>>>>
>>>>> >
>>>>> > I built a stack VM and I get the same result with a Squeak 5.3 image.
>>>>>
>>>>> There*shouldn't* be any difference between the stack & cog vms.
>>>>>
>>>>> You could try building a VM with the fastbitblt turned off I suppose -
>>>>> a quick hack is to find the BITBLT_FLAGS= -DENABLE_FAST_BLT and
>>>>> related lines in the Makefile in you squeak.cog.spur/build directory. I
>>>>> haven't actually built an ARM vm without that in years so I don't know it
>>>>> it even still works.
>>>>>
>>>>>
>>>>> tim
>>>>> --
>>>>> tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
>>>>> It is easier to change the specification to fit the program than vice
>>>>> versa.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>> --
>>>> _,,,^..^,,,_
>>>> best, Eliot
>>>>
>>>>
>>
>
> --
> _,,,^..^,,,_
> best, Eliot
>
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