Comment 7 for bug 1806517

I have the same issue on multiple servers running ubuntu 16.04 or 18.04 since the 9.26 upgrade. In order to convert a PDF file in PNG I use the command:

» convert "myfile.pdf[0]" test.png

Which gives this error:

convert-im6.q16: FailedToExecuteCommand `'gs' -sstdout=%stderr -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 '-sDEVICE=pngalpha' -dTextAlphaBits=4 -dGraphicsAlphaBits=4 '-r72x72' -dFirstPage=1 -dLastPage=1 '-sOutputFile=/tmp/magick-11774WIkYdVETEs9I%d' '-f/tmp/magick-11774JZhknqCDhkN0' '-f/tmp/magick-11774twGtf-JFihri'' (-1) @ error/delegate.c/ExternalDelegateCommand/462.
convert-im6.q16: no images defined `test.png' @ error/convert.c/ConvertImageCommand/3258.

So I tried using ghostscript directly:

» ghostscript -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 -sDEVICE=pngalpha -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -r72x72 -dFirstPage=1 -dLastPage=1 '-sOutputFile=test.png' '-fmyfile.pdf'

Which gives an error:

GPL Ghostscript 9.26 (2018-11-20)
Copyright (C) 2018 Artifex Software, Inc. All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
Processing pages 1 through 1.
Page 1
[1] 10954 segmentation fault (core dumped) ghostscript -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000

If I omit -dFirstPage=1 -dLastPage=1 it works properly:

» ghostscript -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 -sDEVICE=pngalpha -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -r72x72 '-sOutputFile=test.png' '-fmyfile.pdf'
GPL Ghostscript 9.26 (2018-11-20)
Copyright (C) 2018 Artifex Software, Inc. All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
Processing pages 1 through 2.
Page 1
Page 2

Please note that it also affects imagemagick convert command and PHP readimage command.