Sending valgrind logs to...
Gilles Caulier
caulier.gilles at gmail.com
Mon Jul 13 14:23:53 BST 2026
Look at the end of the log : the main memory leak is due to OPenCV DNN
model internal management :
==1415992== 2,964,624 bytes in 2 blocks are possibly lost in loss
record 4,664 of 4,669
==1415992== at 0x485880F: malloc (vg_replace_malloc.c:447)
==1415992== by 0x9F88CC0: cv::fastMalloc(unsigned long) (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0xA08D13F: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0xA088315: cv::Mat::create(int, int const*, int) (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0xA0D9E29: cv::_OutputArray::create(int, int const*,
int, int, bool, cv::_OutputArray::DepthMask) const (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0x9FEC872: cv::Mat::copyTo(cv::_OutputArray const&)
const (in /usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0x96E8EDE: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x96F5A17: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x972A5F7: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x9722DE4:
cv::dnn::dnn4_v20240521::readNetFromONNX(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x9520AD1:
cv::dnn::dnn4_v20240521::readNet(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x62935D0: Digikam::DNNModelNet::callLoader(QString
const&) (in /usr/lib/digikam/libdigikamcore.so.9.0.0)
==1415992==
==1415992== 4,172,486 (40 direct, 4,172,446 indirect) bytes in 1
blocks are definitely lost in loss record 4,666 of 4,669
==1415992== at 0x4858F95: operator new(unsigned long)
(vg_replace_malloc.c:488)
==1415992== by 0x969125C:
cv::dnn::dnn4_v20240521::Net::Impl::connect(int, int, int, int) (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x96913D8:
cv::dnn::dnn4_v20240521::Net::connect(int, int, int, int) (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x96ED023: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x96FCEFD: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x96F3C25: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x96F7297: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x972A5F7: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x9722DE4:
cv::dnn::dnn4_v20240521::readNetFromONNX(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x9520AD1:
cv::dnn::dnn4_v20240521::readNet(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x10E0A1EE:
cv::FaceRecognizerSF::create(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&, int, int) (in
/usr/lib/x86_64-linux-gnu/libopencv_objdetect.so.4.10.0)
==1415992== by 0x62946FC: Digikam::DNNModelSFace::callLoader() (in
/usr/lib/digikam/libdigikamcore.so.9.0.0)
==1415992==
==1415992== 9,175,472 bytes in 6 blocks are possibly lost in loss
record 4,667 of 4,669
==1415992== at 0x485880F: malloc (vg_replace_malloc.c:447)
==1415992== by 0x9F88CC0: cv::fastMalloc(unsigned long) (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0xA08D13F: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0xA088315: cv::Mat::create(int, int const*, int) (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0xA0D9E29: cv::_OutputArray::create(int, int const*,
int, int, bool, cv::_OutputArray::DepthMask) const (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0x9FEC872: cv::Mat::copyTo(cv::_OutputArray const&)
const (in /usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0x96E8AA8: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x96F5A17: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x972A5F7: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x9722DE4:
cv::dnn::dnn4_v20240521::readNetFromONNX(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x9520AD1:
cv::dnn::dnn4_v20240521::readNet(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x10E0A1EE:
cv::FaceRecognizerSF::create(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&, int, int) (in
/usr/lib/x86_64-linux-gnu/libopencv_objdetect.so.4.10.0)
==1415992==
==1415992== 25,690,184 bytes in 1 blocks are possibly lost in loss
record 4,668 of 4,669
==1415992== at 0x485880F: malloc (vg_replace_malloc.c:447)
==1415992== by 0x9F88CC0: cv::fastMalloc(unsigned long) (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0xA08D13F: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0xA088315: cv::Mat::create(int, int const*, int) (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0xA08869F: cv::Mat::create(int, int, int) (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0x9FEC71B: cv::Mat::copyTo(cv::_OutputArray const&)
const (in /usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0x96E8AA8: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x96F5A17: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x972A5F7: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x9722DE4:
cv::dnn::dnn4_v20240521::readNetFromONNX(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x9520AD1:
cv::dnn::dnn4_v20240521::readNet(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x10E0A1EE:
cv::FaceRecognizerSF::create(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&, int, int) (in
/usr/lib/x86_64-linux-gnu/libopencv_objdetect.so.4.10.0)
==1415992==
==1415992== 342,113,140 bytes in 83 blocks are possibly lost in loss
record 4,669 of 4,669
==1415992== at 0x485880F: malloc (vg_replace_malloc.c:447)
==1415992== by 0x9F88CC0: cv::fastMalloc(unsigned long) (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0xA08D13F: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0xA088315: cv::Mat::create(int, int const*, int) (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0xA08869F: cv::Mat::create(int, int, int) (in
/usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0x9FEC71B: cv::Mat::copyTo(cv::_OutputArray const&)
const (in /usr/lib/x86_64-linux-gnu/libopencv_core.so.4.10.0)
==1415992== by 0x96E8EDE: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x96F5A17: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x972A5F7: ??? (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x9722DE4:
cv::dnn::dnn4_v20240521::readNetFromONNX(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x9520AD1:
cv::dnn::dnn4_v20240521::readNet(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&) (in
/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.10.0)
==1415992== by 0x62935D0: Digikam::DNNModelNet::callLoader(QString
const&) (in /usr/lib/digikam/libdigikamcore.so.9.0.0)
==1415992==
It's not at all a dysfunction of digiKAm as well. OPenCV4.10 is used
on your system, OPenCV 4.13 is out with probably the fixes for this
kind of memory leak.
Nota : OpenCV 5.0 available since few weeks ago is not yet supported
in digiKam, as the DNN engine have been completely rewritten and lack
features provided by 4.x version (eg. the GPU support for ex)...
So OpenCV 4 must be used with digiKAm for the moment, not the OpenCV 5
(and it will still like this until OPenCV taem fix all the
regressions.
Best regards
Gilles Caulier
Le lun. 13 juil. 2026 à 15:16, Gilles Caulier
<caulier.gilles at gmail.com> a écrit :
>
> Did you use the native digiKam package from your distribution ?
>
> Which operations did you run in digiKam exactly ?
>
> Best regards
>
> Gilles Caulier
>
> Le lun. 13 juil. 2026 à 13:44, Cyril Giraud <cgiraud at free.fr> a écrit :
> >
> > Hi Gilles,
> >
> > Probably yes for digikam 9.0.0 (native for UbuntuStudio 26.04):
> > ==1415992== LEAK SUMMARY:
> > ==1415992== definitely lost: 9,208 bytes in 93 blocks
> > ==1415992== indirectly lost: 17,819,646 bytes in 71,055 blocks
> > ==1415992== possibly lost: 387,519,486 bytes in 44,750 blocks
> > ==1415992== still reachable: 1,377,846 bytes in 4,720 blocks
> > ==1415992== of which reachable via heuristic:
> > ==1415992== newarray : 381,304 bytes in 12 blocks
> > ==1415992== suppressed: 0 bytes in 0 blocks
> > ==1415992== Reachable blocks (those to which a pointer was found) are not shown.
> > ==1415992== To see them, rerun with: --leak-check=full --show-leak-kinds=all
> >
> > Rerun today with --show-leak-kinds=all (probably not exactly the same GUI actions):
> >
> > ==7409== LEAK SUMMARY:
> > ==7409== definitely lost: 10,144 bytes in 96 blocks
> > ==7409== indirectly lost: 17,853,762 bytes in 76,878 blocks
> > ==7409== possibly lost: 387,503,190 bytes in 39,004 blocks
> > ==7409== still reachable: 1,366,375 bytes in 4,637 blocks
> > ==7409== of which reachable via heuristic:
> > ==7409== newarray : 376,536 bytes in 10 blocks
> > ==7409== suppressed: 0 bytes in 0 blocks
> >
> >
> > Full logs here:
> > J’ai lié 2 fichiers à ce message :
> >
> > digiKam-9.0.0.valgrind.log
> > Taille : 797 Ko
> >
> > Date d’expiration : 14/08/2026
> > NextCloud
> > Lien : https://nextcloud.cgiraud.fr/index.php/s/CPQKTzGGPwkHpmy/download
> >
> > digiKam-9.0.0.valgrind2.log
> > Taille : 5.6 Mo
> >
> > Date d’expiration : 14/08/2026
> > Service Filelink : NextCloud
> > Lien : https://nextcloud.cgiraud.fr/index.php/s/ap2AqoKHatCKGpG/download
> >
> > I tried to run digikam 9.1.0 but running appimage with valgrind seems not working.
> >
> > Best regards,
> > Cyril
> >
> >
> >
> >
> > Le 12/07/2026 à 22:57, Gilles Caulier a écrit :
> >
> > Hi
> > did you observe a potential memory leak? In which context?
> >
> > You can share the trace in this room using a cloud storage link.
> >
> > Best regards
> >
> > Gilles Caulier
> >
> > Le dim. 12 juil. 2026 à 22:51, Cyril Giraud <cgiraud at free.fr> a écrit :
> >
> > Hi,
> >
> > https://www.digikam.org/contribute / Checking for Memory Leaks asks to
> > send valgrind output to developers.
> >
> > Could someone give me an email address or a way to send these outputs?
> >
> > Thanks !
> >
> > Cyril
> >
> >
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