I’m trying to develop a program in C, that relies on some functions in the libsecret Libary.
This Library in turn relies on GLib.
I have some Memory Leaks in my Program that Valgrind detects. However Valgrind doesnt tell me much about where those arise. The Output Looks like
==10387== Memcheck, a memory error detector
==10387== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==10387== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==10387== Command: ./main
==10387==
Error creating new Collection: No such secret collection at path: /==10387==
==10387== HEAP SUMMARY:
==10387== in use at exit: 140,633 bytes in 1,675 blocks
==10387== total heap usage: 9,946 allocs, 8,271 frees, 461,654 bytes allocated
==10387==
==10387== 8 bytes in 1 blocks are definitely lost in loss record 68 of 1,370
==10387== at 0x484DA83: calloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==10387== by 0x49ABC50: g_malloc0 (in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.7200.4)
==10387== by 0x4DCD351: ??? (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x4DCD84B: ??? (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x4D2CFD9: g_initable_new_valist (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x4D2D08C: g_initable_new (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x48B6EA4: _secret_prompt_instance (secret-prompt.c:96)
==10387== by 0x48C3DB6: on_create_collection_called (secret-paths.c:1683)
==10387== by 0x4D63E38: ??? (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x4D6405A: ??? (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x4DC573E: ??? (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x4D63E38: ??? (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387==
==10387== 8 bytes in 1 blocks are definitely lost in loss record 69 of 1,370
==10387== at 0x484DA83: calloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==10387== by 0x49ABC50: g_malloc0 (in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.7200.4)
==10387== by 0x4DCD449: ??? (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x4DCD84B: ??? (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x4D2CFD9: g_initable_new_valist (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x4D2D08C: g_initable_new (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x48B6EA4: _secret_prompt_instance (secret-prompt.c:96)
==10387== by 0x48C3DB6: on_create_collection_called (secret-paths.c:1683)
==10387== by 0x4D63E38: ??? (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x4D6405A: ??? (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x4DC573E: ??? (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387== by 0x4D63E38: ??? (in /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.7200.4)
==10387==
==10387== LEAK SUMMARY:
==10387== definitely lost: 16 bytes in 2 blocks
==10387== indirectly lost: 0 bytes in 0 blocks
==10387== possibly lost: 576 bytes in 2 blocks
==10387== still reachable: 123,593 bytes in 1,520 blocks
==10387== suppressed: 0 bytes in 0 blocks
==10387== Reachable blocks (those to which a pointer was found) are not shown.
==10387== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==10387==
==10387== For lists of detected and suppressed errors, rerun with: -s
==10387== ERROR SUMMARY: 4 errors from 4 contexts (suppressed: 0 from 0)
As you can see there are many instances where there is just “???” shown instead of a function.
A libsecret Developer told me to please first include “debug symbols” so that they can help me efficiently.
For Libsecret I installed the Debug Symbols which I can know find
$ dpkg -l | grep -i debug
ii cinnamon-control-center-dbg 6.0.1+virginia amd64 utilities to configure the Cinnamon desktop - debug symbols
ii gdb 12.1-0ubuntu1~22.04.2 amd64 GNU Debugger
ii gdbserver 12.1-0ubuntu1~22.04.2 amd64 GNU Debugger (remote server)
ii libc6-dbg:amd64 2.35-0ubuntu3.8 amd64 GNU C Library: detached debugging symbols
ii libcinnamon-desktop-dbg:amd64 6.0.0+virginia amd64 Cinnamon shared utility library - debugging symbols
ii libcvc-dbg:amd64 6.0.0+virginia amd64 Cinnamon pulseaudio abstraction library - debug symbols
ii libdebuginfod-common 0.186-1build1 all configuration to enable the Debian debug info server
ii libdebuginfod1:amd64 0.186-1build1 amd64 library to interact with debuginfod (development files)
ii libdw1:amd64 0.186-1build1 amd64 library that provides access to the DWARF debug information
ii libdw1:i386 0.186-1build1 i386 library that provides access to the DWARF debug information
ii libsecret-1-0-dbgsym:amd64 0.20.5-2 amd64 debug symbols for libsecret-1-0
ii muffin-dbg 6.0.1+virginia amd64 window and compositing manager (debugging symbols)
ii nemo-dbg 6.0.2+virginia amd64 file manager and graphical shell for Cinnamon - debugging version
ii node-debug 4.3.2+~cs4.1.7-1 all small debugging utility for Node.js
ii pix-dbg 3.2.2+virginia amd64 image viewer and browser - debugging symbols
ii ubuntu-dbgsym-keyring 2021.03.26 all GnuPG keys of the Ubuntu Debug Symbols Archive
ii xed-dbg 3.4.5+virginia amd64 Text editor (debugging symbols)
ii xreader-dbg 4.0.2+virginia amd64 Document viewer (debugging symbols)
ii xviewer-dbg 3.4.4+virginia amd64 Image viewer - debugging symbols
So those are definitely there.
I searched on how to get those for GLib and came to the conclusion, that I have to compile GLib by myself with Debug options.
So I installed GLib using
meson setup --buildtype=debug ..
ninja
sudo ninja install
and Also later tried
meson setup build --buildtype=debug -Ddebug=true -Db_sanitize=address,undefined
But those seem to didn’t work? As you can see in the Valgrind output there are still things missing & I cant find any symbol files for GLib.
My program is compiled with the -g -O0 flags so, as far as I know there should be all possible Debug Information.
For additional Information, like the Code here is the Issue at the Libsecret Repository.
If I forgto some for you crucial Information feel free to ask, it has been hours over multiple days, I tried many different things which would be far too much to all list here.
I’m new to Valgrind & may misinterpret the Output.