If I am not wrong the problem is created in sage-7.3.beta3. I can try with 
the different patches beta2->beta3. Can anyone guess a good order to do 
that?

El sábado, 14 de enero de 2017, 19:18:32 (UTC+1), Enrique Artal escribió:
>
> I have installed 7.3, 7.4 and 7.5 and we use several instances of sagenb 
> (it is for teaching and we use different addresses for different studies). 
> With 7.3, if a user reaches the limit of CPU time, his worksheet stops and 
> all the data in memory is lost, but quitting and opening the worksheet 
> again causes no problem, and it does not affect other users. With 7.5, the 
> instance of the notebook must be restarted because it does not work for any 
> user of this instance (no problem for the other ones). 
> Is there some documentation for the debugging technique? Is it possible to 
> take beta releases? Enrique. 
>
> El sábado, 14 de enero de 2017, 11:13:37 (UTC+1), Dima Pasechnik escribió:
>>
>> Oh, right, this certainly has nothing to do with sagenb, what is not 
>> stopped is sage worker that does the computation itself, right?
>>
>> Could it be that you updated your OS in the meantime, and if you roll 
>> back to sage 7.3 you would still see the same behaviour?
>>
>> On sage's side it might be ipython update, although I am guessing.
>>
>> There is a debugging technique that would let you find a git commit that 
>> caused the change you noticed, using git bisect, although this might take a 
>> full day of work or so, just because there were few hundred commits and you 
>> would need to run 'make build' a dozen times or so, with testing after each 
>> rebuild...
>>
>>

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