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All the SAGA algorithms seems not usable in Processing Modeler. The same algorithms with the same data runs fine outside the Modeler. Here some other infos:

• SAGA raster algorithms: the only way to have output is to save the outout raster as `sdat` file. Both temporary layers and other formats will fail:

Processing algorithm…
Algorithm 'model' starting…
Input parameters:
{ 'ras' : '/home/matteo/lavori/miei/QPROTO2/DTM.tif', 'saga:rastercalculator_1:fsa' : '/tmp/processing_9f73c2c2a9ec46afa0f9703f84015abb/dcfb7760f5d54397ae189c1cd1238814/saga_rastercalculator_1_fsa.tif' }

Prepare algorithm: saga:rastercalculator_1
Running Raster calculator [1/1]
Input Parameters:
{ FORMULA: 'a*a', GRIDS: '/home/matteo/lavori/miei/QPROTO2/DTM.tif', RESAMPLING: 3, RESULT: '/tmp/processing_9f73c2c2a9ec46afa0f9703f84015abb/dcfb7760f5d54397ae189c1cd1238814/saga_rastercalculator_1_fsa.tif', TYPE: 7, USE_NODATA: False, XGRIDS: ['/home/matteo/lavori/miei/QPROTO2/DTM.tif'] }
grid_calculus "Grid Calculator" -GRIDS "/tmp/processing_9f73c2c2a9ec46afa0f9703f84015abb/2bbd3348cbef489a8e5dd89f0af54cb8/DTM.sgrd" -XGRIDS "/tmp/processing_9f73c2c2a9ec46afa0f9703f84015abb/2bbd3348cbef489a8e5dd89f0af54cb8/DTM.sgrd" -FORMULA "a*a" -RESAMPLING 3 -USE_NODATA false -TYPE 7 -RESULT "/tmp/processing_9f73c2c2a9ec46afa0f9703f84015abb/dcfb7760f5d54397ae189c1cd1238814/saga_rastercalculator_1_fsa.tif" 
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SAGA Version: 2.3.1

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library path: /usr/lib/x86_64-linux-gnu/saga/
library name: libgrid_calculus
library : Calculus
tool : Grid Calculator
author : A.Ringeler (c) 2003
processors : 4 [4]
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Load grid: /tmp/processing_9f73c2c2a9ec46afa0f9703f84015abb/2bbd3348cbef489a8e5dd89f0af54cb8/DTM.sgrd...

Parameters

Grid system: 10; 761x 718y; 346560.239738x 4899625.453186y
Grids: 1 object (DTM)
Grids from different Systems: 1 object (DTM)
Resampling: B-Spline Interpolation
Result: Result
Formula: a*a
Name: Calculation
Take Formula: no
Use NoData: no
Data Type: 4 byte floating point number

Warning: The number of supplied grids exceeds the number of variables in formula. (2 > 1)

OK. Execution took 1.543 s (1 outputs).
Model processed OK. Executed 1 algorithms total in 1.607 s.
Execution completed in 1.65 seconds
Results:
{'saga:rastercalculator_1:fsa': '/tmp/processing_9f73c2c2a9ec46afa0f9703f84015abb/dcfb7760f5d54397ae189c1cd1238814/saga_rastercalculator_1_fsa.tif'}

Loading resulting layers
The following layers were not correctly generated.
/tmp/processing_9f73c2c2a9ec46afa0f9703f84015abb/dcfb7760f5d54397ae189c1cd1238814/saga_rastercalculator_1_fsa.tif
You can check the 'Log Messages Panel' in QGIS main window to find more information about the execution of the algorithm.

• SAGA vector: no algorithms are working. No memory layers, no shapefile, no geopackage:

2018-05-04T14:10:09     CRITICAL    Traceback (most recent call last):
              File "/home/matteo/lavori/QGIS/newbuild/output/python/plugins/processing/algs/saga/SagaAlgorithm.py", line 203, in processAlgorithm
              self.tr('Unsupported file format'))
             _core.QgsProcessingException: Unsupported file format