[Scilab-users] ?==?utf-8?q? scilab 6.1 crashes when trying to load big matfile (loadmatfile)

[Stéphane Mottelet]

> Le 20 juin 2020 à 03:00, Antoine Monmayrant <amonmayr at laas.fr> a écrit :
> 
> Le Vendredi, Juin 19, 2020 15:59 CEST, Rafael Guerra <jrafaelbguerra at hotmail.com> a écrit: 
> 
>> Script runs fine on Win10, Scilab 6.1, 64 GB RAM.
>> But btw, the file a28.mat seems to have only 342MB.
> 
> I suspect that it does work fine with 64GB of ram:

Not so sure. It crashes on a 128GB machine.

S.


> that's how I managed to work around my initial problem.
> This script should be adapted to your available ram: you should try to increase n.
> But in your case, I think you have enough ram to reach scilab maximum variable size (is it something like 2^31-1 maximum elements?) before triggering this bug.
> Ideally, this should be tested on a ram-limited hardware (~8GB).
> The issue is that there might be some malloc() somewhere that fails, while the code tries to use the memory without checking whether the malloc() was successful or not.
> If you have gazillion's of GB of available ram, you never face this problem.
> 
> Antoine
> 
>> 
>> 
>> -----Original Message-----
>> From: users <users-bounces at lists.scilab.org> On Behalf Of Stéphane Mottelet
>> Sent: Friday, June 19, 2020 10:15 AM
>> To: users at lists.scilab.org
>> Subject: Re: [Scilab-users] scilab 6.1 crashes when trying to load big matfile (loadmatfile)
>> 
>> it's the loadmatfile that crashes (here on Scilab-branch-6.1 under OSX, 
>> with 16Gb ram)
>> 
>>   "savematfile('a28.mat','a28');"
>> scilab-cli-bin(3310,0x115f1f5c0) malloc: can't allocate region
>> *** mach_vm_map(size=18446744071562067968) failed (error code=3)
>> scilab-cli-bin(3310,0x115f1f5c0) malloc: *** set a breakpoint in 
>> malloc_error_break to debug
>> 
>> Same crash with Scilab-branch-6.1 under Ubuntu 18.04, with 128Gb ram:
>> 
>>   "a28=[1:2^28];"
>> ATTENTION : Option -v7 ajoutée.
>> 
>>   "savematfile('a28.mat','a28');"
>> Segmentation fault (core dumped)
>> 
>> S.
>> 
>>> Le 19/06/2020 à 08:57, Antoine Monmayrant a écrit :
>>> Hello all,
>>> 
>>> 
>>> Here is a small script that systematically crashes scilab on my machine:
>>> 
>>> 
>>> ////////////////////////////////
>>> 
>>> // on my machine with 8Gb or ram and usual workload, n=28 crashes scilab
>>> n=[24,26,28];
>>> 
>>> for i=n
>>> 
>>>     disp('---- '+string(i)+' ----');
>>>     execstr('a'+string(i)+'=[1:2^'+string(i)+'];')
>>>     disp('a'+string(i)+'=[1:2^'+string(i)+'];')
>>> execstr("savematfile(''a"+string(i)+".mat'',''a"+string(i)+"'');")
>>> disp("savematfile(''a"+string(i)+".mat'',''a"+string(i)+"'');")
>>>     execstr("loadmatfile(''a"+string(i)+".mat'');")
>>>     disp("loadmatfile(''a"+string(i)+".mat'');")
>>>     disp('---- OK ----');
>>> 
>>> end
>>> 
>> 
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