Setting threads parameter leads to Cbc crash #303
Description
Describe the bug
Setting threads parameter using model's setter method doesn't work and leads to crash of Cbc at the end of computation.
ERROR while running Cbc. Signal SIGSEGV caught. Getting stack trace.
...
python3(_PyObject_MakeTpCall+0x296) [0x5f74f6]
python3(_PyEval_EvalFrameDefault+0x5dc4) [0x571164]
python3(_PyEval_EvalCodeWithName+0x26a) [0x569dba]
python3(_PyFunction_Vectorcall+0x393) [0x5f6eb3]
python3(_PyEval_EvalFrameDefault+0x85a) [0x56bbfa]
python3(_PyEval_EvalCodeWithName+0x26a) [0x569dba]
python3(_PyFunction_Vectorcall+0x393) [0x5f6eb3]
python3(_PyEval_EvalFrameDefault+0x85a) [0x56bbfa]
python3(_PyFunction_Vectorcall+0x1b6) [0x5f6cd6]
python3(_PyEval_EvalFrameDefault+0x72d) [0x56bacd]
python3(_PyEval_EvalCodeWithName+0x26a) [0x569dba]
python3(_PyFunction_Vectorcall+0x393) [0x5f6eb3]
python3(_PyEval_EvalFrameDefault+0x72d) [0x56bacd]
python3(_PyEval_EvalCodeWithName+0x26a) [0x569dba]
python3(PyEval_EvalCode+0x27) [0x6902a7]
python3() [0x67f951]
python3() [0x67f9cf]
python3() [0x67fa71]
python3(PyRun_SimpleFileExFlags+0x197) [0x681b97]
python3(Py_RunMain+0x212) [0x6b9d32]
python3(Py_BytesMain+0x2d) [0x6ba0bd]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f92f51de083]
python3(_start+0x2e) [0x5fc5fe]
To Reproduce
model.threads = 2
model.optimize()
Expected behavior
Threads limited to 2 and Cbc oesn't crash
Desktop (please complete the following information):
- Operating System, version: Ubuntu 20.04.4 LTS
- Python version: 3.8.10
- Python-MIP version (we recommend you to test with the latest version): 1.14.1
Additional context
I notice that it works fine by using the Cbc wrapped method. Like:
cbc_set_parameter(model.solver, "threads", "{}".format(2))