Running processCcd on monocam data segfaults during astrometry.

Steps to reproduce:

• Download attached datafile.
• conda install v12.1 of the stack
• setup ticket branch DM-8401 of obs_monocam

• ingestImages.py path/to/downloaded/file/2016-05-12CAblank5_y4_70.fits

• processCcd.py filename --rerun test_1 --id visit=1333 --doraise -c isr.doLinearize=False isr.doBias=False isr.doDark=False isr.doFlat=False

Should see segfault after

processCcd.calibrate.astrometry.solver INFO: Number of selected sources for astrometry : 552

.

Interestingly, running processCcd with -c calibrate.doAstrometry=False results in the astrometric solver still being run, and a segfault still occurring, but in a different place. Just mentioning as this may or may not be useful debug info.