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ultra summit set segfaults #3
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Some initial checks with valgrind. Make a file
Then, after compiling with
Output file
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The problem seems to come from the expressions
we get the output
Thus, I think the problem is due to trying to copy an empty
will segfault if |
E-mail de Bert:
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This same bug appears to be hit here: It definitely looks like it gets confused about the factors in a braid that is a power of Delta. |
Yes, I supposed we looked at this years ago but never fixed it. I seemed to have emailed Bert Wiest about it above. I'm not the author of the code and I didn't have time back then to look at it more deeply. Not sure if you have a patch to suggest. |
I am working on it, but might need some help understanding what the method does (in particular, what is it supposed to do in that case). I have emailed Juan Gonzalez Meneses and Maria cumplido for help. |
I am suspicious with the solution, because if I try to compute the centralizer of the examples that used to crash, I get something that indeed is in the centralizer, but does not contain the braid itself (which should be trivially on the centralizer). |
I create a branch The code doesn't crash, and the output of foo.txt is:
Does this look right? |
Bug uncovered by Bert Wiest.
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