Hi! I came over this bug after the latest upload of enigmail to debian. The build only failed on mips and on mipsel, on mipsel with the message "Bus error". https://buildd.debian.org/fetch.cgi?pkg=enigmail;ver=2%3A1.0.1-2;arch=mipsel;stamp=1275567604 The command "install-xpi" that exposes this bus error is a python script. It uses the package python-rdflib, which is an RDF library. The parser for the supported RDF query language is generated C code. I don't have shell access to a mipsel machine, so I did all my tests in qemu using -M malta as machine type. The first thing I tried is to compile without optimization. The error no longer occured. So I tried to reduce the largest function in the generated parser by removing debug code first that shouldn't change the results. Unfortunately, after the removal of one type of these debug blocks, the "Bus error" no longer occured. So I did a binary search on the number of blocks I could remove before the problem disappears. The result is that I have two versions of the parser that only differ in 8 lines with one exposing the bug, the other not. The command-line is $ gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict- prototypes -g -O2 -fPIC -I/usr/include/python2.5 -c src/bison/SPARQLParser.c -o build/temp.linux-mips-2.5/src/bison/SPARQLParser.o The two versions of the parser are available from http://wserver.wm1.at/~willi/debian/gcc_mipsel_bug/ The source package is available from http://packages.debian.org/source/sid/rdflib A stripped down version of install-xpi that's enough to trigger the bug is available from the following Debian bug: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=584327 It's then enough to run $ ./install-xpi install.rdf to trigger the bug. Is this a gcc bug? In theory, it could also be a python bug (or some other python extension's bug) but this is very unlikely (I think) because the problem only occurs with optimization enabled and only on mipsel and maybe mips. (The build on of mips fails at the same position (build log), but with SEGFAULT. As I haven't set up a mips machine, I can't say whether it looks like the same issue.) WM Please CC: me on replies.
