memory leak in png()
I don't have a valgrind-capable version of R, but I'd be interested to
see whether this is a one-time loss, or repeated. That is, do you get a
much bigger loss from running the lossy code in a loop like this?
for (i in 1:100) { png(filename='p.png'); plot(1:10); dev.off() }
Duncan Murdoch
On 17/01/2023 4:55 a.m., Martin Maechler wrote:
Edward Ionides
on Mon, 16 Jan 2023 09:04:49 -0500 writes:
> Hi all,
> Yesterday I discovered what seems to me like a memory leak in png() so I'm
> reporting it in case that is helpful. Here is a small reproducible example:
> R -d "valgrind --tool=memcheck --track-origins=yes --leak-check=full"
> --vanilla -e "png(filename='p.png'); plot(1:10); dev.off()"
> ## HAS LEAK
> ==1021711== LEAK SUMMARY:
> ==1021711== definitely lost: 9,216 bytes in 30 blocks
> ==1021711== indirectly lost: 19,370 bytes in 838 blocks
> ==1021711== possibly lost: 3,868 bytes in 8 blocks
> R -d "valgrind --tool=memcheck --track-origins=yes --leak-check=full"
> --vanilla -e "pdf(file='p.pdf'); plot(1:10); dev.off()"
> ## NO LEAK
> ==1031300== LEAK SUMMARY:
> ==1031300== definitely lost: 0 bytes in 0 blocks
> ==1031300== indirectly lost: 0 bytes in 0 blocks
> ==1031300== possibly lost: 0 bytes in 0 blocks
I can reproduce, although I need to have the memcheck options in ~/.valgrindrc
The same happens if grid-based graphics is used and for the
latest R-devel :
R-devel -d valgrind --vanilla -e 'png("p.png");lattice::xyplot(1~1);dev.off()'
Using png() shows leak
using pdf() is fine (0 bytes lost)
Looking at the full report (--leak-check=full --track-origins=true
as 2 lines in ~/.valgrindrc ) I see several origins tracked to
internal malloc code,
but then also e.g.,
==1410108== 96 bytes in 1 blocks are possibly lost in loss record 700 of 3,037
==1410108== at 0x484A464: calloc (vg_replace_malloc.c:1328)
==1410108== by 0x159EA3A0: g_malloc0 (gmem.c:155)
==1410108== by 0x15A3AB8C: g_rc_box_alloc_full.constprop.0 (grcbox.c:234)
==1410108== by 0x1600A6C9: UnknownInlinedFun (pangofc-fontmap.c:899)
==1410108== by 0x1600A6C9: UnknownInlinedFun (pangofc-fontmap.c:2145)
==1410108== by 0x1600A6C9: pango_fc_font_map_load_fontset (pangofc-fontmap.c:2245)
==1410108== by 0x158E7474: UnknownInlinedFun (itemize.c:892)
==1410108== by 0x158E7474: UnknownInlinedFun (itemize.c:952)
==1410108== by 0x158E7474: pango_itemize_with_font (itemize.c:1564)
==1410108== by 0x158FA89E: pango_layout_check_lines.part.0.lto_priv.0 (pango-layout.c:4894)
==1410108== by 0x158EF4DB: UnknownInlinedFun (pango-layout.c:4786)
==1410108== by 0x158EF4DB: pango_layout_get_line (pango-layout.c:1715)
==1410108== by 0x1B5E441F: PG_text_extents (cairoFns.c:1487)
==1410108== by 0x1B5E441F: PangoCairo_StrWidth (cairoFns.c:1565)
==1410108== by 0x4CEBE6: GEStrWidth (engine.c:2615)
==1410108== by 0x4CEBE6: GEStrWidth (engine.c:2578)
==1410108== by 0x1BE12D11: textRect (util.c:198)
==1410108== by 0x1BDFAF19: gridText (grid.c:3740)
==1410108== by 0x1BE01FAB: L_textBounds (grid.c:3892)
which (from the bottom up) shows package grid C code,
then R main but infrastructure for grDevices ("GEStrWidth (engine.c)") and
subdirectory grDevices/src/cairo/cairoFns.c
and then goes into system cairo or pangocairo libraries,
which here (Linux Fedora 36) are (I thik)
libpangocairo-1.0.so.0
libpango-1.0.so.0
{as they are stripped, I don't know how to check }
To *fix* this I also have to defer to others.
Thank you for the report,
Martin
--
Martin Maechler
ETH Zurich and R Core team
> For some context, I am running R4.2.2. My goal was to run valgrind on the
> latest version of my spatPomp package. A memory leak was detected by
> rhub::check_with_valgrind(). I then tracked down the problem by running
> valgrind locally and in the end it seemed to come down to a problem with
> png(). This was used in the spatPomp unit tests while testing the plot
> method. I can use pdf() instead, but the point here is to report the issue
> in case it is not known.
> I'm new to R package development and happy to accept any advice.
> Thanks,
> Ed
> Edward L. Ionides
> Associate Chair for Undergraduate Studies and Professor,
> Department of Statistics, University of Michigan
> 1085 South University, Ann Arbor, MI 48109-1107
> email: ionides at umich.edu
> phone: 734 615 3332
> office: 453 West Hall
> [[alternative HTML version deleted]]
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