# Segmentation fault (core dumped) using fastq.info()

**URL:** https://forum.mothur.org/t/segmentation-fault-core-dumped-using-fastq-info/20159
**Category:** mothur bugs
**Created:** [October 17, 2019, 9:45pm UTC](https://forum.mothur.org/t/segmentation-fault-core-dumped-using-fastq-info/20159 "2019-10-17T21:45:59Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![aghudson](https://avatars.discourse-cdn.com/v4/letter/a/bc79bd/32.png) [@aghudson](https://forum.mothur.org/u/aghudson)
#### Post date: [October 17, 2019, 9:45pm UTC](https://forum.mothur.org/t/segmentation-fault-core-dumped-using-fastq-info/20159/1 "2019-10-17T21:45:59Z")

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Hi,

I am trying to use the fastq.info() command to demultiplex some 16S amplicon sequencing reads.

I downloaded version 1.42.3 version of mothur for linux (Mothur.linux\_64.zip).

I ran the following command: fastq.info(file=MY001\_info,oligos=MY001\_oligos.txt,fasta=F,bdiffs=1). The program runs for a short time but then I get the following error message “Segmentation fault (core dumped)”

I get the same error message whether I use the direct download of mothur or use the anaconda installation.

I ran the command again with the debug flag, and this is the final screen output:

“[DEBUG]: forward findex aligned fragment=TAGCAG-C, barcode=TAGCAGAC, numDiffs=1.  
[DEBUG]: forward findex aligned fragment=T-AGCAGCT, barcode=TCAGC-GTT, numDiffs=3.  
[DEBUG]: forward findex aligned fragment=—TAGCAGC, barcode=TCATAG-A-C, numDiffs=5.  
[DEBUG]: forward findex aligned fragment=TAGCAGCT—, barcode=–TC-GCTACG, numDiffs=7.  
[DEBUG]: forward findex aligned fragment=TAGCAGCT—, barcode=–TC-GCTATA, numDiffs=7.  
[DEBUG]: reverse rindex aligned fragment=ATCGT-ACG, barcode=A-CGTCTCG, numDiffs=3.  
[DEBUG]: reverse rindex aligned fragment=—ATC-G, barcode=ACTATCTG, numDiffs=4.  
[DEBUG]: reverse rindex aligned fragment=–A-TCGTAC, barcode=AGAGTC–AC, numDiffs=5.  
[DEBUG]: reverse rindex aligned fragment=ATCGTACG, barcode=ATCGTACG, numDiffs=0.  
[DEBUG]: reverse rindex aligned fragment=ATCGT-ACG–, barcode=–CGTGA-GTG, numDiffs=6.  
[DEBUG]: reverse rindex aligned fragment=ATCG-TACG-, barcode=–CGTTACTA, numDiffs=5.  
[DEBUG]: reverse rindex aligned fragment=ATCGTACG—, barcode=–C-TACTATA, numDiffs=7.  
[DEBUG]: reverse rindex aligned fragment=ATCGTACG—, barcode=–C-TGCGTGT, numDiffs=7.  
[DEBUG]: reverse rindex aligned fragment=—ATCGT, barcode=GACACCGT, numDiffs=4.  
[DEBUG]: reverse rindex aligned fragment=-ATCGTACG-, barcode=GATCGT–GT, numDiffs=4.  
[DEBUG]: reverse rindex aligned fragment=----ATCGT, barcode=GGATATC-T, numDiffs=5.  
[DEBUG]: reverse rindex aligned fragment=ATCGT-ACG—, barcode=—GTCA-GATA, numDiffs=8.  
[DEBUG]: reverse rindex aligned fragment=ATCGTACG----, barcode=----TACGAGAC, numDiffs=8.  
[DEBUG]: reverse rindex aligned fragment=ATCGTA-CG—, barcode=----TAGCGAGT, numDiffs=8.  
[DEBUG]: reverse rindex aligned fragment=–ATCGTACG, barcode=TCATCG-A-G, numDiffs=4.  
[DEBUG]: reverse rindex aligned fragment=ATCGTACG–, barcode=-TCG-ACGAG, numDiffs=4.  
Segmentation fault (core dumped)”

Is this an error with the program or installation or is this my error in setting up the info.file and oligos.txt?

Thanks for any help you can give,

Alan

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### Author: ![westcott](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.mothur.org/westcott/32/18_2.png) [@westcott](https://forum.mothur.org/u/westcott)
#### Post date: [October 22, 2019, 1:35pm UTC](https://forum.mothur.org/t/segmentation-fault-core-dumped-using-fastq-info/20159/2 "2019-10-22T13:35:59Z")

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Could you send your log file and inputs files to [mothur.bugs@gmail.com](mailto:mothur.bugs@gmail.com)?

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### Author: ![system](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.mothur.org/system/32/2_2.png) [@system](https://forum.mothur.org/u/system)
#### Post date: [November 1, 2019, 1:36pm UTC](https://forum.mothur.org/t/segmentation-fault-core-dumped-using-fastq-info/20159/3 "2019-11-01T13:36:03Z")

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