# segmentation fault with rarefaction.shared
**URL:** https://forum.mothur.org/t/segmentation-fault-with-rarefaction-shared/1974
**Category:** mothur bugs
**Created:** [August 9, 2014, 3:58pm UTC](https://forum.mothur.org/t/segmentation-fault-with-rarefaction-shared/1974 "2014-08-09T15:58:17Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@azel](https://forum.mothur.org/u/azel)
#### Post date: [August 9, 2014, 3:58pm UTC](https://forum.mothur.org/t/segmentation-fault-with-rarefaction-shared/1974/1 "2014-08-09T15:58:17Z")
I have previously run rarefaction.shared with subsampling on mothur v.1.32.1 with no problems, however 3 days ago I started the following:
rarefaction.shared(shared=file.shared, subsample=3997)
It took 3 days to complete, and when it was done I received the following:
Segmentation fault: 11
logout
[Process completed]
However, it has been 3 hours since this popped up and I have yet to receive a new “mothur\>” command line.
This command has never taken this long to complete before, and I have never received that a segmentation fault before. Not sure if this is a bug or simply an error caused by my specific data?
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### Author:  [@pschloss](https://forum.mothur.org/u/pschloss)
#### Post date: [August 13, 2014, 11:59am UTC](https://forum.mothur.org/t/segmentation-fault-with-rarefaction-shared/1974/2 "2014-08-13T11:59:07Z")
Weird - i wonder if there’s something wrong with file.shared? Perhaps you want to rerun make.shared and try again.
Pat