Xcos error: "Unable to load block from library..."

Reported by Paul BIGNIER

Originally assigned to Marcos Cardinot

BUG DESCRIPTION:
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Open Xcos & Palette,
in the Scilab console, start a long loop, such as ' for(i=1:10000000) a=0; end '
During the loop, successively drag any blocks into a diagram. After a few blocks dragged, Xcos displays an error "Unable to load block from library ...", and the Scilab console displays a "Stack problem detected within a loop." error.

Bug first reported by user in the mailing list: 


ERROR LOG:
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HOW TO REPRODUCE THE BUG:
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OTHER INFORMATION:
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added Bugzilla Medium PC Xcos master GIT version [master branch] labels

By Clement DAVID (@davidcl)

Thanks for the report but can you clarify the expected result ?

As of Scilab 5.4.0, the blocks are no more loaded as SOD but instanciated (o = MY_BLOCK("define")) through the Scilab interpreter. Is it ok to disable the drag action while Scilab is busy ?

By Paul BIGNIER

(In reply to Clement DAVID from comment #1)

Thanks for the report but can you clarify the expected result ?

As of Scilab 5.4.0, the blocks are no more loaded as SOD but instanciated (o = MY_BLOCK("define")) through the Scilab interpreter. Is it ok to disable the drag action while Scilab is busy ?

Sounds like a safe idea to me (message like "Please wait for Scilab to complete task").

How about diagram opening while Scilab is busy ? Can it potentially generate the error too ? I did not manage to make it happen.

By Alexandre HERISSE

Hi,

When starting the long scilab loop as described in this bug, I remark that pressing the start simulation button in the same time leads to the same crash.

Best regards.