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Ghostcript no longer hangs when converting a PDF file to PNG
Previously, when converting a PDF file into a PNG file, Ghostscript could become unresponsive. This bug has been fixed, and the conversion time is now proportional to the size of the PDF file being converted.
Created attachment 1118609[details]
test.pdf in question
Description of problem:
When converting a PDF to PNG using 'convert', it hangs.
Version-Release number of selected component (if applicable):
RHEL 7
ImageMagick-6.7.8.9-10.el7.x86_64
How reproducible:
Always
Steps to Reproduce:
1. Download PDF
2. Attempt to convert PDF with 'convert test.pdf test.png'
Actual results:
Hangs, no output
Expected results:
Output test.png
Additional info:
Customer was able to get around this using an upstream version.
The pstack shows that the convert command is actually waiting for the 'gs' command to return. So this is most likely a problem in ghostscript and not ImageMagick. I'm moving the components and I'll see if I can determine what gs is up to to cause the problem.
According to strace, ImageMagick is executing the following command:
/usr/bin/gs -q -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT \
-dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 -sDEVICE=pam \
-dTextAlphaBits=4 -dGraphicsAlphaBits=4 -r72x72 -dUseCIEColor \
-sOutputFile=/tmp/magick-gvr4A3Qr-%08d -f/tmp/magick-FGoe7KZa \
-f/tmp/magick-B-PH4C8T"
/tmp/magick-B-PH4C8T is a symlink to the original file passed to ImageMagick
/tmp/magick-FGoe7KZa is a file containing one space (0x20):
$ hexdump -C /tmp/magick-FGoe7KZa
00000000 20 | |
This works (or at least it returns):
$ gs -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -sDEVICE=pam \
-sOutputFile=test.pam -f test.pdf
GPL Ghostscript 9.07 (2013-02-14)
Copyright (C) 2012 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
Adding options fails when I reach "-dTextAlphaBits=4":
/usr/bin/gs -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT \
-dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 -sDEVICE=pam \
-dTextAlphaBits=4 -sOutputFile=test.pam -f test.pdf
The rest of the command, without "-dTextAlphaBits=4" doesn't hang:
$ /usr/bin/gs -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT \
-dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 -sDEVICE=pam \
-dGraphicsAlphaBits=4 -r72x72 -dUseCIEColor -sOutputFile=test.pam \
-f test.pdf
GPL Ghostscript 9.07 (2013-02-14)
Copyright (C) 2012 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
So I'm guessing the problem is with "-dTextAlphaBits=4"
Comment 10David Kaferad // Dee'Kej
2016-06-22 11:59:46 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2016-2550.html
Created attachment 1118609 [details] test.pdf in question Description of problem: When converting a PDF to PNG using 'convert', it hangs. Version-Release number of selected component (if applicable): RHEL 7 ImageMagick-6.7.8.9-10.el7.x86_64 How reproducible: Always Steps to Reproduce: 1. Download PDF 2. Attempt to convert PDF with 'convert test.pdf test.png' Actual results: Hangs, no output Expected results: Output test.png Additional info: Customer was able to get around this using an upstream version.