Package: texlive-binaries
Version: 2025.20250727.75242+ds-4
Severity: normal
User: [email protected]
Usertags: randomness toolchain
I have found that when a PNG image's row width does not correspond to a
whole number of bytes, the low-order bits of the last byte in each
uncompressed row can fluctuate between pdflatex runs, at least when
libpng can perform SIMD-assisted decompression, yielding
nondeterministic output even when arranging to supply predetermined
timestamps. (Moreover, this fluctuation can affect the length of the
resulting compressed stream, slightly shifting the file position of
subsequent content.)
In particular, such nondeterminism occurs when including images with
4-bit color maps and odd row lengths, such as FLTK's valuators.png [1].
I tried to put together a minimal example, but the bits in question
came out all zero, presumably because there hadn't yet been enough
memory churn. At any rate, I suspect it would help for the PNG-reading
code to prezero the last byte of the row buffer, at least in this
scenario.
Could you please take a look?
Thanks!
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List of ls-R files
-rw-r--r-- 1 amu amu 171 Oct 21 2005 /home/amu/share/texmf/ls-R
-rw-rw-r-- 1 root staff 80 Apr 8 2025 /usr/local/share/texmf/ls-R
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lrwxrwxrwx 1 root root 29 Feb 28 2025 /usr/share/texmf/ls-R ->
/var/lib/texmf/ls-R-TEXMFMAIN
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/var/lib/texmf/ls-R-TEXLIVEDIST
######################################
Config files
-rw-r--r-- 1 root root 1656 Mar 5 2025 /etc/texmf/web2c/texmf.cnf
lrwxrwxrwx 1 root root 33 Sep 29 18:31 /usr/share/texmf/web2c/fmtutil.cnf ->
/var/lib/texmf/fmtutil.cnf-DEBIAN
lrwxrwxrwx 1 root root 32 Sep 29 18:31 /usr/share/texmf/web2c/updmap.cfg ->
/var/lib/texmf/updmap.cfg-DEBIAN
-rw-r--r-- 1 root root 5067 Oct 4 23:44
/var/lib/texmf/tex/generic/config/language.dat
######################################
Files in /etc/texmf/web2c/
total 8
-rw-r--r-- 1 root root 283 Jun 25 2011 mktex.cnf
-rw-r--r-- 1 root root 1656 Mar 5 2025 texmf.cnf
######################################
md5sums of texmf.d
ca40c66f144b4bafc3e59a2dd32ecb9c /etc/texmf/texmf.d/00debian.cnf
d588a08518f705d06ac262acd78f2bc4 /etc/texmf/texmf.d/20xmltex.cnf
8e901c9e6562b73e4ba4d1b4e603412f /etc/texmf/texmf.d/30ptex.bak
055e06548bac99958d8ab2dd1248f2b4 /etc/texmf/texmf.d/80tex4ht.cnf
1df66bc319cec731e202eaf39f5d85e1 /etc/texmf/texmf.d/96JadeTeX.cnf
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Versions of packages texlive-binaries depends on:
ii libc6 2.41-12
ii libcairo2 1.18.4-1+b1
ii libfontconfig1 2.15.0-2.4
ii libfreetype6 2.13.3+dfsg-1
ii libgcc-s1 15.2.0-4
ii libgraphite2-3 1.3.14-11
ii libharfbuzz0b 12.1.0-1
ii libicu76 76.1-4
ii libkpathsea6 2025.20250727.75242+ds-4
ii libmpfi0 1.5.4+ds-4
ii libmpfr6 4.2.2-2
ii libpaper2 2.2.5-0.3+b2
ii libpixman-1-0 0.46.4-1
ii libpng16-16t64 1.6.50-1
ii libpotrace0 1.16-2+b2
ii libptexenc1 2025.20250727.75242+ds-4
ii libstdc++6 15.2.0-4
ii libsynctex2 2025.20250727.75242+ds-4
ii libteckit0 2.5.12+ds1-1+b1
ii libtexlua53-5 2025.20250727.75242+ds-4
ii libx11-6 2:1.8.12-1
ii libxaw7 2:1.0.16-1
ii libxi6 2:1.8.2-1
ii libxmu6 2:1.1.3-3+b4
ii libxpm4 1:3.5.17-1+b3
ii libxt6t64 1:1.2.1-1.3
ii libzzip-0-13t64 0.13.78+dfsg.1-0.2
ii perl 5.40.1-6
ii t1utils 1.41-4
ii tex-common 6.19
ii zlib1g 1:1.3.dfsg+really1.3.1-1+b1
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ii texlive-base 2025.20250927-3
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ii texlive-binaries-sse2 2025.20250727.75242+ds-4
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Versions of packages tex-common suggests:
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Versions of packages texlive-binaries is related to:
ii tex-common 6.19
ii texlive-base 2025.20250927-3
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