[Rd] memory leak in png()
Tim Taylor
t|m@t@y|or @end|ng |rom h|ddene|eph@nt@@co@uk
Tue Jan 17 14:39:01 CET 2023
On 17/01/2023 13:06, Duncan Murdoch wrote:
> 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
Duncan - Not that I'm seeing
Rdevel -d valgrind --vanilla -e " for (i in 1:1) {png(filename='p.png');
plot(1:10); dev.off()}"
==63291== LEAK SUMMARY:
==63291== definitely lost: 2,560 bytes in 4 blocks
==63291== indirectly lost: 17,710 bytes in 762 blocks
==63291== possibly lost: 1,820 bytes in 8 blocks
==63291== still reachable: 52,177,408 bytes in 21,282 blocks
==63291== of which reachable via heuristic:
==63291== newarray : 4,264 bytes in 1
blocks
==63291== suppressed: 0 bytes in 0 blocks
Rdevel -d valgrind --vanilla -e " for (i in 1:100)
{png(filename='p.png'); plot(1:10); dev.off()}"
==63464== LEAK SUMMARY:
==63464== definitely lost: 2,560 bytes in 4 blocks
==63464== indirectly lost: 17,710 bytes in 762 blocks
==63464== possibly lost: 1,820 bytes in 8 blocks
==63464== still reachable: 56,072,939 bytes in 19,283 blocks
==63464== of which reachable via heuristic:
==63464== newarray : 4,264 bytes in 1
blocks
==63464== suppressed: 0 bytes in 0 blocks
Tim
>
>
> 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 using umich.edu
>> > phone: 734 615 3332
>> > office: 453 West Hall
>>
>> > [[alternative HTML version deleted]]
>>
>> > ______________________________________________
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>>
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