Re: segfaults building documentation when machine under load

On Tue, May 19, 2020 at 8:44 AM John W. Eaton <[email protected]> wrote:

> On 5/19/20 7:19 AM, Dmitri A. Sergatskov wrote:
> >
> >
> > On Tue, May 19, 2020 at 7:07 AM Andreas Weber <[email protected]
> > <mailto:[email protected]>> wrote:
> >
> >     I'm not able to reproduce it with debugging symbols... but here is
> gdb
> >     without without symbols:
> >
> >
> > How do you run gdb with parallel?
>
> would enable core files (ulimit -c unlimited in bash) and run gdb on the
> core file resulting from the crash.
>
> Could you also try
>
>    (gdb) thread apply all bt
>
> to see whether that gives additional clues about the location and cause
> of the crash?
>
>
I cannot reproduce the crash with parallel. I am still getting some kind of
crash while building doc/.
With default compiler flags i get a coredump that appears completely
useless:

Stack trace of thread 3125:
                                              #0  0x000000000a70756f n/a
(n/a)
                                              #1  0x00007fa14eb3c9ae n/a
(/home/dima/src/octave/gcc_def/libgui/.libs/liboctgui.so.6.0.0)
                                              #2  0x00007ffd98e0b660 n/a
(n/a)

With "-O0 -ggdb3" no crash.
With "-O1 -ggdb3" or "-O2 -ggdb3" I do not get a coredump. The crash is
something like:

/bin/sh run-octave --norc --silent --no-history --path
/home/dima/src/octave/gcc_debug/../doc/interpreter/ --eval "splineimages
('doc/interpreter/', 'splinefit3', 'png');"
error: imwrite: invalid empty image
error: called from
    __imwrite__ at line 40 column 5
    imwrite at line 125 column 5
    print at line 755 column 13
    sparseimages at line 53 column 5
/bin/sh run-octave --norc --silent --no-history --path
/home/dima/src/octave/gcc_debug/../doc/interpreter/ --eval "splineimages
('doc/interpreter/', 'splinefit4', 'png');"
/bin/sh run-octave --norc --silent --no-history --path
/home/dima/src/octave/gcc_debug/../doc/interpreter/ --eval "splineimages
('doc/interpreter/', 'splinefit6', 'png');"
make[2]: *** [Makefile:31328: doc/interpreter/gplot.png] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory '/home/dima/src/octave/gcc_debug'
make[1]: *** [Makefile:27418: all-recursive] Error 1
make[1]: Leaving directory '/home/dima/src/octave/gcc_debug'
make: *** [Makefile:11053: all] Error 2

the actual input file would be different from run to run, e.g. it could be:
/bin/sh run-octave --norc --silent --no-history --path
/home/dima/src/octave/gcc_debug/../doc/interpreter/ --eval "geometryimages
('doc/interpreter/', 'inpolygon', 'png');"
error: imwrite: invalid empty image
error: called from
    __imwrite__ at line 40 column 5
    imwrite at line 125 column 5
    print at line 755 column 13
    geometryimages at line 70 column 5
/bin/sh run-octave --norc --silent --no-history --path
/home/dima/src/octave/gcc_debug/../doc/interpreter/ --eval "interpimages
('doc/interpreter/', 'interpft', 'png');"
/bin/sh run-octave --norc --silent --no-history --path
/home/dima/src/octave/gcc_debug/../doc/interpreter/ --eval "interpimages
('doc/interpreter/', 'interpn', 'png');"
/bin/sh run-octave --norc --silent --no-history --path
/home/dima/src/octave/gcc_debug/../doc/interpreter/ --eval "interpimages
('doc/interpreter/', 'interpderiv1', 'png');"
make[2]: *** [Makefile:31198: doc/interpreter/triplot.png] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory '/home/dima/src/octave/gcc_debug'
make[1]: *** [Makefile:27418: all-recursive] Error 1
make[1]: Leaving directory '/home/dima/src/octave/gcc_debug'
make: *** [Makefile:11053: all] Error 2



> jwe
>

Dmitri.