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Okay, this probably shows something. I add it here in case
you have a comment on how to submit the bug. But if you
don't, I'll just put in a report on a "dumps core" bug with
this included:

gdb ./python ./core
GNU gdb 4.17.0.11 with Linux support
...
This GDB was configured as "i386-redhat-linux"...
Core was generated by `./python'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libdl.so.2...done.
Reading symbols from /lib/libpthread.so.0...done.
Reading symbols from /lib/libutil.so.1...done.
Reading symbols from /lib/libm.so.6...done.
Reading symbols from /lib/libc.so.6...done.
Reading symbols from /lib/ld-linux.so.2...done.
#0  0x8075732 in eval_frame (f=0x8124f94) at Python/ceval.c:1310
1310                            Py_DECREF(u);