I now have access to a Debian Sparc box, and I can reproduce the
problem. The crash happens in the pthreads library, and I find it
confusing that this should happen on Linux/Sparc, but no other
platforms (that I'm aware of). Looking at the code, there's nothing
immediately obvious, unless there is a bug packing unions into
structs, causing a pointer alignment problem. Actually, that does seem
to be the problem: the second union does not sit on a 64 bit aligned
boundary.
Anyway, in the short term, the solution is to disable threading in
Ghostscript (it's rarely used, and only if the caller actually asks
for it). To do so, change the definition in the Makefile after
configure (or in Makefile.in) of the SYNC setting. By default it is:
SYNC=posync
and changing it to:
SYNC=nosync
will disable threading.
And Ghostscript should run as expected.
I intend to add a "nosync" option to configure for the next release,
and I will obviously investigate solving the alignment problem.
HTH,
Chris
Quoting Jonathan Nieder <[email protected]>:
Hi,
Stéphane Glondu wrote:
ocaml-melt currently FTBFS on sparc [1] because of a bus error
provoked by ps2pdf. The bus error is easily reproduced by running
ps2pdf on the file available at [2]. This bug is not present with the
previous version, 8.71~dfsg2-10.
Thanks for reporting it. If anyone has time on a sparc, what might be
useful is
apt-get build-dep ghostscript
git clone git://git.ghostscript.com/ghostscript.git
cd ghostscript/gs
# configure to minimize features (hopefully speeding up build)
./autogen.sh -C \
--disable-fontconfig \
--disable-freetype --disable-cups --disable-gtk \
--enable-dynamic --with-system-libtiff \
--without-ijs --without-jbig2dec --without-jasper
make
# [2]
lib/ps2pdfwr /path/to/doc.ps
git show -s HEAD
If that reproduces the error, it could be reported at
http://bugs.ghostscript.com and I'd be glad to hear about it.
git bisect start
git bisect bad HEAD
git bisect good ghostscript-8.71
can guide through the bisection process afterwards to find the bad
patch (which is hopefully an underalignment problem or similar).
Any takers?
Jonathan
[1]
https://buildd.debian.org/fetch.cgi?pkg=ocaml-melt&arch=sparc&ver=1.3.0-2&stamp=1297644449&file=log&as=raw
[2] http://glondu.net/tmp/doc.ps
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