Package:libopencv-dnn4.5 Version: 4.5.4+dfsg-1 Severity: serious User: ubuntu-de...@lists.ubuntu.com Usertags: origin-ubuntu jammy
libopencv-dnn is provided as a shared library in Debian, but it evidently
does not have a stable ABI.
This shows up in the gyoto autopkgtests, which, miserably, don't exit
non-zero on these errors:
$ ./debian/tests/gyoto-mk-video
WARNING: PatternDisk: not tested for repeat_phi_>1; check your results
Traceback (most recent call last):
File "<string>", line 2, in <module>
File "/usr/lib/python3/dist-packages/gyoto/animate.py", line 823, in main
mk_video(**args.__dict__)
File "/usr/lib/python3/dist-packages/gyoto/animate.py", line 655, in mk_video
video=backend(output, fps, width, height)
File "/usr/lib/python3/dist-packages/gyoto/animate.py", line 125, in __init__
import cv2
ImportError: /usr/lib/python3/dist-packages/cv2.cpython-39-x86_64-linux-gnu.so:
undefined symbol: _ZTIN2cv3dnn14dnn4_v202106085LayerE
$
This symbol was present in opencv 4.5.3 but is not present in 4.5.4:
$ apt download libopencv-dnn4.5=4.5.3+dfsg-1ubuntu1
Get:1 http://archive.ubuntu.com/ubuntu jammy/universe amd64 libopencv-dnn4.5
amd64 4.5.3+dfsg-1ubuntu1 [972 kB]
Fetched 972 kB in 3s (307 kB/s)
$ dpkg-deb -R libopencv-dnn4.5_4.5.3+dfsg-1ubuntu1_amd64.deb dnn-4.5.3
$ objdump -T dnn-4.5.3/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.5|grep
_ZTIN2cv3dnn14dnn4_v202106085LayerE
00000000002fd448 g DO .data.rel.ro 0000000000000018 Base
_ZTIN2cv3dnn14dnn4_v202106085LayerE
$ apt download libopencv-dnn4.5
Get:1 http://archive.ubuntu.com/ubuntu jammy-proposed/universe amd64
libopencv-dnn4.5 amd64 4.5.4+dfsg-1ubuntu2 [1102 kB]
Fetched 1102 kB in 2s (550 kB/s)
$ dpkg-deb -R libopencv-dnn4.5_4.5.4+dfsg-1ubuntu2_amd64.deb dnn-4.5.4
$ objdump -T dnn-4.5.4/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.5|grep
_ZTIN2cv3dnn14dnn4_v202106085LayerE
$
opencv uses no symbols files to prevent ABI skew; and from the type name
(dnn4_v20210608) it appears this is not a stable interface. But it is
exported, and it is used.
This is also not a one-off symbol change.
$ diff -u <(objdump -T dnn-4.5.3/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.5
| grep '\.text' | cut -b50- |sort) <(objdump -T
dnn-4.5.4/usr/lib/x86_64-linux-gnu/libopencv_dnn.so.4.5 | grep '\.text' | cut
-b50- |sort) | grep -c ^-
256
$
Since upstream doesn't ship a stable ABI here, there are basically two
choices:
- change the binary package name and conflict with older versions of the
library (libopencv-dnn4.5debian1 Conflicts: libopencv-dnn4.5)
- ship this as a static library only.
--
Steve Langasek Give me a lever long enough and a Free OS
Debian Developer to set it on, and I can move the world.
Ubuntu Developer https://www.debian.org/
slanga...@ubuntu.com vor...@debian.org
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