Alan, Simple fix. Problem was just that the plD_eop_svgqt function wasn't properly checking the familying option to see if the page should be saved or not. This caused a seg fault for me. The other qt drivers producing single pages do seem to check properly so this was just an oversight.
Should now be ok. Andrew On Sun, Nov 18, 2012 at 05:00:42PM -0800, Alan Irwin wrote: > Hi Andrew: > > I have recently been doing some tests of familying devices > _without_ the -fam option, and I discovered a memory management > issue for -dev svgqt for this corner case. > > software@raven> valgrind examples/c/x02c -dev svgqt -o test.epsqt > ==22913== Memcheck, a memory error detector > ==22913== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et > al. > ==22913== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright > info > ==22913== Command: examples/c/x02c -dev svgqt -o test.epsqt > ==22913== > > *** PLPLOT WARNING *** > All pages after the first skipped because family file output not > specified. > > ==22913== Invalid read of size 8 > ==22913== at 0x779A3A8: QPainter::end() (in > /usr/lib/x86_64-linux-gnu/libQtGui.so.4.8.2) > ==22913== by 0x6E01600: plD_eop_svgqt(PLStream*) (in > /home/software/plplot_svn/HEAD/build_dir/drivers/qt.so) > ==22913== by 0x4E4C5A6: plP_eop (in > /home/software/plplot_svn/HEAD/build_dir/src/libplplotd.so.11.0.0) > ==22913== by 0x40134E: demo2 (in > /home/software/plplot_svn/HEAD/build_dir/examples/c/x02c) > ==22913== by 0x400D85: main (in > /home/software/plplot_svn/HEAD/build_dir/examples/c/x02c) > ==22913== Address 0x0 is not stack'd, malloc'd or (recently) free'd > ==22913== > ==22913== > ==22913== Process terminating with default action of signal 11 (SIGSEGV) > ==22913== Access not within mapped region at address 0x0 > ==22913== at 0x779A3A8: QPainter::end() (in > /usr/lib/x86_64-linux-gnu/libQtGui.so.4.8.2) > ==22913== by 0x6E01600: plD_eop_svgqt(PLStream*) (in > /home/software/plplot_svn/HEAD/build_dir/drivers/qt.so) > ==22913== by 0x4E4C5A6: plP_eop (in > /home/software/plplot_svn/HEAD/build_dir/src/libplplotd.so.11.0.0) > ==22913== by 0x40134E: demo2 (in > /home/software/plplot_svn/HEAD/build_dir/examples/c/x02c) > ==22913== by 0x400D85: main (in > /home/software/plplot_svn/HEAD/build_dir/examples/c/x02c) > ==22913== If you believe this happened as a result of a stack > ==22913== overflow in your program's main thread (unlikely but > ==22913== possible), you can try to increase the size of the > ==22913== main thread stack using the --main-stacksize= flag. > ==22913== The main thread stack size used in this run was 8388608. > ==22913== > ==22913== HEAP SUMMARY: > ==22913== in use at exit: 1,017,715 bytes in 7,267 blocks > ==22913== total heap usage: 57,682 allocs, 50,415 frees, 7,520,506 > bytes allocated > ==22913== > ==22913== LEAK SUMMARY: > ==22913== definitely lost: 1,560 bytes in 5 blocks > ==22913== indirectly lost: 5,344 bytes in 166 blocks > ==22913== possibly lost: 117,185 bytes in 335 blocks > ==22913== still reachable: 893,626 bytes in 6,761 blocks > ==22913== suppressed: 0 bytes in 0 blocks > ==22913== Rerun with --leak-check=full to see details of leaked memory > ==22913== > ==22913== For counts of detected and suppressed errors, rerun with: -v > ==22913== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 10 from > 6) > Segmentation fault > > Other familied devices for this device driver (e.g., pngqt and epsqt) > without the -fam option give valgrind-clean results as do all three > familied qt devices if the -fam option is used. So I am sure the > issue is svgqt handles the no-familying case slightly differently > than pngqt and epsqt, but the difficulty is finding where this > error occurs in our svgqt-related code. > > Alan > __________________________ > Alan W. Irwin > > Astronomical research affiliation with Department of Physics and Astronomy, > University of Victoria (astrowww.phys.uvic.ca). > > Programming affiliations with the FreeEOS equation-of-state > implementation for stellar interiors (freeeos.sf.net); the Time > Ephemerides project (timeephem.sf.net); PLplot scientific plotting > software package (plplot.sf.net); the libLASi project > (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); > and the Linux Brochure Project (lbproject.sf.net). > __________________________ > > Linux-powered Science > __________________________ > > ------------------------------------------------------------------------------ > Monitor your physical, virtual and cloud infrastructure from a single > web console. Get in-depth insight into apps, servers, databases, vmware, > SAP, cloud infrastructure, etc. Download 30-day Free Trial. > Pricing starts from $795 for 25 servers or applications! > http://p.sf.net/sfu/zoho_dev2dev_nov > _______________________________________________ > Plplot-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/plplot-devel > ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Plplot-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/plplot-devel
