[Bug]: can't import cv2 #23031

Ar57m · 2025-01-25T06:09:17Z

Problem description

Got this this error, I reinstalled termux and it persisted. Do I need to install something or is it a bug?

import cv2
  File "/data/data/com.termux/files/usr/lib/python3.12/site-packages/cv2/__init__.py", line 181, in <module>
    bootstrap()                                                 File "/data/data/com.termux/files/usr/lib/python3.12/site-packages/cv2/__init__.py", line 153, in bootstrap                   native_module = importlib.import_module("cv2")
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/usr/lib/python3.12/importlib/__init__.py", line 90, in import_module                        return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                             ImportError: dlopen failed: cannot locate symbol "eglDestroySyncKHR" referenced by "/system/lib64/libgui.so"...

What steps will reproduce the bug?

import cv2 on a python script

What is the expected behavior?

import and use opencv

System information

termux-info
Termux Variables:
TERMUX_APK_RELEASE=F_DROID
TERMUX_APP_PACKAGE_MANAGER=apt
TERMUX_APP_PID=30038                                          TERMUX_IS_DEBUGGABLE_BUILD=0
TERMUX_MAIN_PACKAGE_FORMAT=debian
TERMUX_VERSION=0.118.1                                        TERMUX__USER_ID=0                                             Packages CPU architecture:
aarch64
Subscribed repositories:
# sources.list
deb https://packages-cf.termux.dev/apt/termux-main/ stable main
# x11-repo (sources.list.d/x11.list)
deb https://packages-cf.termux.dev/apt/termux-x11/ x11 main
Updatable packages:
All packages up to date
termux-tools version:
1.44.6
Android version:
13
Kernel build information:
Linux localhost 5.4.233-qgki-27101688-abM526BXXS5CXE2 #1 SMP PREEMPT Fri May 17 15:23:51 KST 2024 aarch64 Android
Device manufacturer:                                          samsung
Device model:
SM-M526B
LD Variables:
LD_LIBRARY_PATH=
LD_PRELOAD=/data/data/com.termux/files/usr/lib/libtermux-exec.so

The text was updated successfully, but these errors were encountered:

Biswa96 · 2025-01-25T06:18:12Z

ImportError: dlopen failed: cannot locate symbol "eglDestroySyncKHR" referenced by "/system/lib64/libgui.so"

It seems to be the Android OS issue specific to the device. Please try to export the variable first LD_PRELOAD=/system/lib64/libEGL.so

Ar57m · 2025-01-25T06:23:37Z

ImportError: dlopen failed: cannot locate symbol "eglDestroySyncKHR" referenced by "/system/lib64/libgui.so"

It seems to be the Android OS issue specific to the device. Please try to export the variable first LD_PRELOAD=/system/lib64/libEGL.so

tried that and printed this when importing cv2:

CANNOT LINK EXECUTABLE "/data/data/com.termux/files/usr/bin/python": cannot locate symbol "Xzs_Construct" referenced by "/system/lib64/libunwindstack.so"...

no idea why that happens, idk how to locate this one, I'm probably never going to pkg upgrade again lol

Ar57m · 2025-01-25T15:27:36Z

here more info

~/changes $ termux-info
Termux Variables:
TERMUX_APK_RELEASE=F_DROID
TERMUX_APP_PACKAGE_MANAGER=apt
TERMUX_APP_PID=31945
TERMUX_IS_DEBUGGABLE_BUILD=0
TERMUX_MAIN_PACKAGE_FORMAT=debian
TERMUX_VERSION=0.118.1
TERMUX__USER_ID=0
Packages CPU architecture:
aarch64
Subscribed repositories:
# sources.list
deb https://mirrors.ravidwivedi.in/termux/termux-main stable main
# x11-repo (sources.list.d/x11.list)
deb https://mirrors.ravidwivedi.in/termux/termux-x11 x11 main
Updatable packages:
All packages up to date
termux-tools version:
1.44.6
Android version:
13
Kernel build information:
Linux localhost 5.4.233-qgki-27101688-abM526BXXS5CXE2 #1 SMP PREEMPT Fri May 17 15:23:51 KST 2024 aarch64 Android
Device manufacturer:
samsung
Device model:
SM-M526B
LD Variables:
LD_LIBRARY_PATH=
LD_PRELOAD=/system/lib64/libEGL.so
~/changes $ printenv
SHELL=/data/data/com.termux/files/usr/bin/bash
COLORTERM=truecolor
HISTCONTROL=ignoreboth
PREFIX=/data/data/com.termux/files/usr
TERMUX_IS_DEBUGGABLE_BUILD=0
TERMUX_MAIN_PACKAGE_FORMAT=debian
PWD=/data/data/com.termux/files/home/changes
TERMUX_VERSION=0.118.1
EXTERNAL_STORAGE=/sdcard
LD_PRELOAD=/system/lib64/libEGL.so
HOME=/data/data/com.termux/files/home
LANG=en_US.UTF-8
TERMUX_APK_RELEASE=F_DROID
DEX2OATBOOTCLASSPATH=/apex/com.android.art/javalib/core-oj.jar:/apex/com.android.art/javalib/core-libart.jar:/apex/com.android.art/javalib/okhttp.jar:/apex/com.android.art/javalib/bouncycastle.jar:/apex/com.android.art/javalib/apache-xml.jar:/system/framework/framework.jar:/system/framework/framework-graphics.jar:/system/framework/ext.jar:/system/framework/telephony-common.jar:/system/framework/voip-common.jar:/system/framework/ims-common.jar:/system/framework/knoxsdk.jar:/system/framework/SmpsManager.jar:/system/framework/uibc_java.jar:/system/framework/esecomm.jar:/system/framework/tcmiface.jar:/system/framework/telephony-ext.jar:/system/framework/QPerformance.jar:/system/framework/UxPerformance.jar:/apex/com.android.i18n/javalib/core-icu4j.jar
TMPDIR=/data/data/com.termux/files/usr/tmp
ANDROID_DATA=/data
TERM=xterm-256color
ANDROID_I18N_ROOT=/apex/com.android.i18n
SHLVL=1
ANDROID_ROOT=/system
BOOTCLASSPATH=/apex/com.android.art/javalib/core-oj.jar:/apex/com.android.art/javalib/core-libart.jar:/apex/com.android.art/javalib/okhttp.jar:/apex/com.android.art/javalib/bouncycastle.jar:/apex/com.android.art/javalib/apache-xml.jar:/system/framework/framework.jar:/system/framework/framework-graphics.jar:/system/framework/ext.jar:/system/framework/telephony-common.jar:/system/framework/voip-common.jar:/system/framework/ims-common.jar:/system/framework/knoxsdk.jar:/system/framework/SmpsManager.jar:/system/framework/uibc_java.jar:/system/framework/esecomm.jar:/system/framework/tcmiface.jar:/system/framework/telephony-ext.jar:/system/framework/QPerformance.jar:/system/framework/UxPerformance.jar:/apex/com.android.i18n/javalib/core-icu4j.jar:/apex/com.android.adservices/javalib/framework-adservices.jar:/apex/com.android.adservices/javalib/framework-sdksandbox.jar:/apex/com.android.appsearch/javalib/framework-appsearch.jar:/apex/com.android.btservices/javalib/framework-bluetooth.jar:/apex/com.android.conscrypt/javalib/conscrypt.jar:/apex/com.android.ipsec/javalib/android.net.ipsec.ike.jar:/apex/com.android.media/javalib/updatable-media.jar:/apex/com.android.mediaprovider/javalib/framework-mediaprovider.jar:/apex/com.android.ondevicepersonalization/javalib/framework-ondevicepersonalization.jar:/apex/com.android.os.statsd/javalib/framework-statsd.jar:/apex/com.android.permission/javalib/framework-permission.jar:/apex/com.android.permission/javalib/framework-permission-s.jar:/apex/com.android.scheduling/javalib/framework-scheduling.jar:/apex/com.android.sdkext/javalib/framework-sdkextensions.jar:/apex/com.android.tethering/javalib/framework-connectivity.jar:/apex/com.android.tethering/javalib/framework-connectivity-t.jar:/apex/com.android.tethering/javalib/framework-tethering.jar:/apex/com.android.uwb/javalib/framework-uwb.jar:/apex/com.android.wifi/javalib/framework-wifi.jar:/apex/com.samsung.android.ipm/javalib/framework-samsung-ipm.jar:/apex/com.samsung.android.shell/javalib/framework-samsung-privilege.jar
ANDROID_TZDATA_ROOT=/apex/com.android.tzdata
TERMUX_APP_PID=31945
PATH=/data/data/com.termux/files/usr/bin
ANDROID_ART_ROOT=/apex/com.android.art
OLDPWD=/data/data/com.termux/files/home
_=/data/data/com.termux/files/usr/bin/printenv

weird that through the command line calling python and importing cv2 works fine

Ar57m · 2025-01-26T00:03:33Z

forgot to say im running another python script through a subprocess, how can I fix that? was working fine before

licy183 · 2025-01-26T03:53:30Z

I can't reproduce it on my device. It is well-known that on some devices the android linker doesn't resolve symbols correctly. apt install libandroid-stub and try again.

Ar57m · 2025-01-26T04:13:50Z

I can't reproduce it on my device. It is well-known that on some devices the android linker doesn't resolve symbols correctly. apt install libandroid-stub and try again.

that didn't help unfortunately, here my code which has this problem https://github.com/Ar57m/another_fractal_generator/tree/server
server.py creates a subprocess which runs runner.py which imports tools.py which imports cv2 and uses it on its functions. I got this error after updating everything using pkg, was working fine before 🤔

Biswa96 · 2025-01-26T04:28:50Z

You could try appending lzma in LD_PRELOAD. liblzma.so have the Xzs_Construct symbol.

LD_PRELOAD=/system/lib64/libEGL.so:/system/lib64/liblzma.so

Ar57m · 2025-01-26T04:34:56Z

You could try appending lzma in LD_PRELOAD. liblzma.so have the Xzs_Construct symbol.
LD_PRELOAD=/system/lib64/libEGL.so:/system/lib64/liblzma.so

error changed to

ImportError: dlopen failed: cannot locate symbol "glEGLImageTargetTexture2DOES" referenced by "/system/lib64/libgui.so"...

licy183 · 2025-01-26T04:56:02Z

that didn't help unfortunately,

Try not setting LD_PRELOAD (or set it to /data/data/com.termux/files/usr/lib/libtermux-exec.so).

Ar57m · 2025-01-26T06:10:59Z

I think I may have found the problem, my main script server.py was importing my module tools.py, the same that I'm importing on runner.py(which runs on a subprocess on server.py), after removing it, it magically works fine again, somehow it's conflicting 🤔. Thanks everyone for the help, I think you guys can close the issue.

Biswa96 · 2025-01-26T06:12:55Z

I think, importing python script should not cause that kind of issue. If there is any error in python script it should be a python error.

Ar57m · 2025-01-26T14:44:30Z

yeah it's odd let me give you a example code where I hit it:

alpha.py

import subprocess
import gamma #comment it if it crashes

if __name__ == "__main__":
    print("Running beta.py as a subprocess")
    subprocess.run(["python", "beta.py"])
    gamma.debug_message() #comment it if it crashes

beta.py

import gamma

if __name__ == "__main__":
    print("Creating a white image using gamma module")
    gamma.save_image("white_image.jpg", color=(255, 255, 255))

gamma.py

import cv2
import numpy as np

def save_image(filename, color):
    print(f"Saving image: {filename}")
    image = np.full((100, 100, 3), color, dtype=np.uint8)
    cv2.imwrite(filename, image)
    print(f"Image {filename} saved successfully")

def debug_message():
    print("Debug: gamma.py is imported successfully")

truboxl · 2025-01-27T02:06:37Z

Reproduce your issue with environment variable LD_DEBUG=1 then post logcat output

Ar57m · 2025-01-27T03:14:30Z

Reproduce your issue with environment variable LD_DEBUG=1 then post logcat output

here

log_output.txt

truboxl · 2025-01-27T04:52:51Z

I can reproduce the issue. Suspect leakage in ffmpeg libavcodec.so.61.19.100 that links libmediandk.so which pulls libs in /system/lib64.

Please run these commands to build a stub libmediandk.so and see if it can resolve your issue:

curl -L https://android.googlesource.com/platform/frameworks/av/+/master/media/ndk/libmediandk.map.txt?format=TEXT | base64 -d > libmediandk.map.txt
for i in $(grep ';' libmediandk.map.txt | grep -vE '}|\*' | cut -d';' -f1 | awk '{ print $1 }' | sort -u); do echo "void $i() {}"; done | tee mediandk.c
cc mediandk.c -o $PREFIX/lib/libmediandk.so -shared

Ar57m · 2025-01-27T05:00:37Z

I can reproduce the issue. Suspect leakage in ffmpeg libavcodec.so.61.19.100 that links libmediandk.so which pulls libs in /system/lib64.

Please run these commands to build a stub libmediandk.so and see if it can resolve your issue:

curl -L https://android.googlesource.com/platform/frameworks/av/+/master/media/ndk/libmediandk.map.txt?format=TEXT | base64 -d > libmediandk.map.txt
for i in $(grep ';' libmediandk.map.txt | grep -vE '}|*' | cut -d';' -f1 | awk '{ print $1 }' | sort -u); do echo "void $i() {}"; done | tee mediandk.c
cc mediandk.c -o $PREFIX/lib/libmediandk.so -shared

nice that worked really well 🎉
no more errors

python alpha.py
Running beta.py as a subprocess
Creating a white image using gamma module
Saving image: white_image.jpg
Image white_image.jpg saved successfully
Debug: gamma.py is imported successfully

licy183 · 2025-01-27T05:06:31Z

Maybe libmediandk.so should be shipped as part of libandroid-stub...

truboxl · 2025-01-27T13:06:08Z

Maybe libmediandk.so should be shipped as part of libandroid-stub...

Sounds good to me. I dont have better solution.

gphg · 2025-03-03T23:12:19Z

I'm having the same problem while using a Python module.

Traceback (most recent call last):
  File "/data/data/com.termux/files/usr/bin/scenedetect", line 5, in <module>
    from scenedetect.__main__ import main
  File "/data/data/com.termux/files/usr/lib/python3.12/site-packages/scenedetect/__init__.py", line 25, in <module>
    import cv2 as _
  File "/data/data/com.termux/files/usr/lib/python3.12/site-packages/cv2/__init__.py", line 181, in <module>
    bootstrap()
  File "/data/data/com.termux/files/usr/lib/python3.12/site-packages/cv2/__init__.py", line 153, in bootstrap
    native_module = importlib.import_module("cv2")
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/data/com.termux/files/usr/lib/python3.12/importlib/__init__.py", line 90, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ImportError: dlopen failed: cannot locate symbol "_ZN4absl12lts_2024011612log_internal9kCharNullE" referenced by "/data/data/com.termux/files/usr/lib/libopencv_dnn.so"...

It was working two days ago. I have no idea why.

Update:
I suspect it has to do with Numpy, as I get this warning on reinstalling opencv-python.

pkg reinstall opencv-python
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 0 B/1607 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 74484 files and directories currently installed.)
Preparing to unpack .../opencv-python_4.11.0_aarch64.deb ...
Unpacking opencv-python (4.11.0) over (4.11.0) ...
Setting up opencv-python (4.11.0) ...
WARNING: opencv-python is compiled with numpy 2.2.1, but numpy 2.2.3 is installed. Please report it to https://github.com/termux/termux-packages if any bug happens.

licy183 · 2025-03-04T10:14:21Z

Revbumping opencv should resolve it. Has been done in e5f01d4.

gphg · 2025-03-04T14:01:16Z

Revbumping opencv should resolve it. Has been done in e5f01d4.

Thanks. It is working now. Worth of reporting. 👍

Ar57m added bug report Something is not working properly untriaged labels Jan 25, 2025

licy183 added system-level bug Bug is hidden somewhere in OS and can't be fixed and removed untriaged labels Jan 26, 2025

licy183 mentioned this issue Jan 30, 2025

libandroid-stub: ship libmediandk.so #23067

Merged

licy183 closed this as completed in #23067 Jan 31, 2025

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[Bug]: can't import cv2 #23031

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[Bug]: can't import cv2 #23031

[Bug]: can't import cv2 #23031

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Ar57m commented Jan 25, 2025

Problem description

What steps will reproduce the bug?

What is the expected behavior?

System information

Biswa96 commented Jan 25, 2025

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