I agree that there's no obvious way for a subcomponent package to affect a core-compiled function, but I see this effect on all three machines I have access to today, all running testing ( vanilla testing install, upgraded crouton install, upgraded Compute Engine instance) . For the machines where I initially discovered this crashing problem, uninstalling the ltfat package appears to have resolved the problem with rcond completely.
Here's the octave-related package list from a machine that displays the problem (minus octave-ltfat) : $ dpkg -l 'octave*' | grep ^ii ii octave 3.8.2-4 amd64 GNU Octave language for numerical computations ii octave-audio 1.1.4-5 amd64 functions to work with audio files in Octave ii octave-bim 1.1.5-1 all PDE solver using a finite element/volume approach in Octave ii octave-common 3.8.2-4 all architecture-independent files for octave ii octave-communications 1.2.0-2+b1 amd64 communications package for Octave ii octave-communications-common 1.2.0-2 all communications package for Octave (arch-indep files) ii octave-control 2.6.6-1 amd64 control functions for Octave from Octave-Forge ii octave-data-smoothing 1.3.0-3 all functions to do data smoothing on noisy data ii octave-dataframe 1.0.1-1 all manipulate data in Octave similar to R data.frame ii octave-econometrics 1:1.1.1-2+b1 amd64 econometrics functions for Octave ii octave-financial 0.4.0-2 all financial manipulation and plotting functions ii octave-fpl 1.3.4-2 all plot data on unstructured triangular and tetrahedral meshes in Octave ii octave-ga 0.10.0-2 all genetic optimization code for Octave ii octave-general 1.3.4-2 amd64 provide extra general functions for Octave ii octave-geometry 1.7.0-2 amd64 geometric computing functions for Octave ii octave-gsl 1.0.8-6 amd64 GSL binding for Octave ii octave-image 2.2.2-1 amd64 image manipulation for Octave ii octave-io 2.2.4-1 amd64 input/output data functions for Octave ii octave-linear-algebra 2.2.0-3 amd64 additional linear-algebra functions for Octave ii octave-ltfat-common 2.0.1-1 all Large Time/Frequency Analysis Toolbox (arch-indep files) ii octave-msh 1.0.10-1 amd64 create and manage meshes for FE or FV solvers in Octave ii octave-optim 1.4.0-1 amd64 unconstrained non-linear optimization toolkit for Octave ii octave-signal 1.3.0-1 amd64 signal processing functions for Octave ii octave-splines 1.2.7-2 all cubic spline functions for Octave ii octave-struct 1.0.10-2 amd64 additional structure manipulation functions for Octave $ Thanks for looking into this so quickly! By uninstalling the package, it's no longer a blocker for my work, but after spending more than a day narrowing down the problem, I'd like to save someone else the effort! :). Charlie On Mon, Apr 20, 2015 at 2:29 PM, Charlie Hagedorn < charlie.haged...@gmail.com> wrote: > Package: octave-ltfat > Version: 2.0.1-1 > Severity: important > > Dear Maintainer, > > I've had inconsistent Octave seg-faults on several jessie machines that > I've traced to at least the octave-ltfat package. The seg-faults are > triggered calls to the Octave function rcond. Installing octave-ltfat makes > it break, uninstalling restores expected behavior (i.e. not crashing > Octave). > > I discovered this problem when chasing down a segmentation fault in > octave-optim's leasqr function. rcond breaks only on matrices of size > greater than 9 (31 is used below), so it will only turn up when fitting > functions of ten or more parameters. > > Example breakage: > > cah49@charlie:~$ octave --quiet > octave:1> rcond(magic(31)) > ans = 0.030391 > octave:2> cah49@charlie:~$ > cah49@charlie:~$ sudo apt-get install octave-ltfat > Reading package lists... Done > Building dependency tree > Reading state information... Done > The following NEW packages will be installed: > octave-ltfat > 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded. > Need to get 0 B/561 kB of archives. > After this operation, 7,074 kB of additional disk space will be used. > Selecting previously unselected package octave-ltfat. > (Reading database ... 100497 files and directories currently installed.) > Preparing to unpack .../octave-ltfat_2.0.1-1_amd64.deb ... > Unpacking octave-ltfat (2.0.1-1) ... > Setting up octave-ltfat (2.0.1-1) ... > cah49@charlie:~$ octave --quiet > octave:1> rcond(magic(31)) > Segmentation fault > cah49@charlie:~$ sudo apt-get remove octave-ltfat > Reading package lists... Done > Building dependency tree > Reading state information... Done > The following package was automatically installed and is no longer > required: > octave-ltfat-common > Use 'apt-get autoremove' to remove it. > The following packages will be REMOVED: > octave-ltfat > 0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded. > After this operation, 7,074 kB disk space will be freed. > Do you want to continue? [Y/n] y > (Reading database ... 100544 files and directories currently installed.) > Removing octave-ltfat (2.0.1-1) ... > cah49@charlie:~$ octave --quiet > octave:1> rcond(magic(31)) > ans = 0.030391 > octave:2> > > I will update this bug report if I find any other packages that break > *** Reporter, please consider answering these questions, where appropriate > *** > > * What was the outcome of this action? > * What outcome did you expect instead? > > *** End of the template - remove these template lines *** > > > -- System Information: > Debian Release: 8.0 > APT prefers testing-updates > APT policy: (500, 'testing-updates'), (500, 'testing') > Architecture: amd64 (x86_64) > > Kernel: Linux 3.16.0-4-amd64 (SMP w/8 CPU cores) > Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) > Shell: /bin/sh linked to /bin/dash > Init: systemd (via /run/systemd/system) > > Versions of packages octave-ltfat depends on: > ii libblas3 [libblas.so.3] 1.2.20110419-10 > ii libc6 2.19-18 > ii libfftw3-double3 3.3.4-2 > ii libfftw3-single3 3.3.4-2 > ii libgcc1 1:4.9.2-10 > ii libgfortran3 4.9.2-10 > ii liblapack3 [liblapack.so.3] 3.5.0-4 > ii liboctave2 3.8.2-4 > ii libopenblas-base [liblapack.so.3] 0.2.12-1 > ii libquadmath0 4.9.2-10 > ii libstdc++6 4.9.2-10 > ii octave 3.8.2-4 > ii octave-ltfat-common 2.0.1-1 > > octave-ltfat recommends no packages. > > octave-ltfat suggests no packages. > > -- no debconf information >
