Dear all,

I have a subject whose Freesurfer processing crashes during topology fixing step. The last lines in `recon-all.log` are:

After retessellation of defect 2 (v0=22890), euler #=-15 (110444,329616,219157) : difference with theory (-18) = -3
CORRECTING DEFECT 3 (vertices=8808, convex hull=2020, v0=31369)
Segmentation fault (core dumped)
Linux compute-0-2.local 2.6.32-504.16.2.el6.x86_64 #1 SMP Wed Apr 22 06:48:29 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
recon-all -s 81489f2bb-M12_T1_01 exited with ERRORS at Tue Apr 27 21:23:59 CEST 2021

For the full `recon-all.log` and `recon-all.error` files please see the attached files.

I tried to follow the manual topology fixing instructions from MailScanner has detected a possible fraud attempt from "secure-web.cisco.com" claiming to be https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/TopologicalDefect_freeview, but *.white and *.pial surface files are missing from `surf` directory. It only contains these files:

lh.defect_borders lh.defect_labels lh.orig.nofix lh.smoothwm.nofix rh.orig.nofix rh.smoothwm.nofix
lh.defect_chull lh.inflated.nofix lh.qsphere.nofix rh.inflated.nofix rh.qsphere.nofix

Which files can I use in place of white and pial surface files in order to look for WM segmentation defects?

Some additional information about the data:

- I am running Freesurfer 7.1

- overall, there are no gross errors in WM segmentation, although the subjects does have significant temporal lobe atrophy

- there are two images acquired at different times, and processing fails for both images

- interestingly, processing didnt crash with Freesurfer 6.

Thank you and have a great weekend,

Renat.