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* [Bug libstdc++/111347] New: Memory leak loading a shared library built with --static-libsdtc++ when version script is used @ 2023-09-08 21:58 gyunaev at ulduzsoft dot com 2023-09-08 22:01 ` [Bug libstdc++/111347] " pinskia at gcc dot gnu.org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: gyunaev at ulduzsoft dot com @ 2023-09-08 21:58 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111347 Bug ID: 111347 Summary: Memory leak loading a shared library built with --static-libsdtc++ when version script is used Product: gcc Version: 13.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: gyunaev at ulduzsoft dot com Target Milestone: --- Created attachment 55860 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55860&action=edit The source code of the library, tester and Makefile Gcc 13.2 built from the source. Linux x86_64, OpenSuSe Leap 15.5. Our team has found that when building a C++ DSO using --static-libgcc and --static-libstdc++ and using a version script to hide the visibility of symbols, loading and unloading the resulting shared library leaks memory each time such dlopen/dlclose happens. If a version script is not used, there is no leak. Smallest shared library source which reproduces the issue: ------ libtest.cpp ------ #include <string> int test() { std::string a; return a.length(); } --- The version script: ------ libtest.ver ------ { global: test; local: *; }; --- Built with: g++ -fPIC -shared -static-libgcc -static-libstdc++ -Wl,--version-script=libtest.ver libtest.cpp -o libtest.so load-unload of this library leaks memory each time it unloads. Loading-unloading is all that is needed - you don't need to call test or even dlsym it. Easiest to see it when running dlclose( dlopen( "./libtest.so", RTLD_NOW)) in a loop. If you remove --version-script and rebuild the library, load-unload will not leak. Experimentally we found out that adding the symbol "_ZNSt8messagesIwE2idE;" into global: section of version script would stop the leak, but this isn't obvious to me why. This symbol demangles into std::messages<wchar_t>::id; Attaching the tester, makefile and the loader. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/111347] Memory leak loading a shared library built with --static-libsdtc++ when version script is used 2023-09-08 21:58 [Bug libstdc++/111347] New: Memory leak loading a shared library built with --static-libsdtc++ when version script is used gyunaev at ulduzsoft dot com @ 2023-09-08 22:01 ` pinskia at gcc dot gnu.org 2023-09-09 1:28 ` gyunaev at ulduzsoft dot com ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-09-08 22:01 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111347 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- I am pretty sure _ZNSt8messagesIwE2idE is marked as GNU unique .... ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/111347] Memory leak loading a shared library built with --static-libsdtc++ when version script is used 2023-09-08 21:58 [Bug libstdc++/111347] New: Memory leak loading a shared library built with --static-libsdtc++ when version script is used gyunaev at ulduzsoft dot com 2023-09-08 22:01 ` [Bug libstdc++/111347] " pinskia at gcc dot gnu.org @ 2023-09-09 1:28 ` gyunaev at ulduzsoft dot com 2023-09-09 4:49 ` gyunaev at ulduzsoft dot com 2023-09-11 11:18 ` redi at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: gyunaev at ulduzsoft dot com @ 2023-09-09 1:28 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111347 --- Comment #2 from George Yunaev <gyunaev at ulduzsoft dot com> --- Adding -fno-gnu-unique to the makefile for libleak.so doesn't remove the leak. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/111347] Memory leak loading a shared library built with --static-libsdtc++ when version script is used 2023-09-08 21:58 [Bug libstdc++/111347] New: Memory leak loading a shared library built with --static-libsdtc++ when version script is used gyunaev at ulduzsoft dot com 2023-09-08 22:01 ` [Bug libstdc++/111347] " pinskia at gcc dot gnu.org 2023-09-09 1:28 ` gyunaev at ulduzsoft dot com @ 2023-09-09 4:49 ` gyunaev at ulduzsoft dot com 2023-09-11 11:18 ` redi at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: gyunaev at ulduzsoft dot com @ 2023-09-09 4:49 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111347 --- Comment #3 from George Yunaev <gyunaev at ulduzsoft dot com> --- Indeed making a unique symbol local results in a leak. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/111347] Memory leak loading a shared library built with --static-libsdtc++ when version script is used 2023-09-08 21:58 [Bug libstdc++/111347] New: Memory leak loading a shared library built with --static-libsdtc++ when version script is used gyunaev at ulduzsoft dot com ` (2 preceding siblings ...) 2023-09-09 4:49 ` gyunaev at ulduzsoft dot com @ 2023-09-11 11:18 ` redi at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: redi at gcc dot gnu.org @ 2023-09-11 11:18 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111347 --- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> --- There's a reason it's marked as unique: it needs to be globally visible and globally unique. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2023-09-11 11:18 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-09-08 21:58 [Bug libstdc++/111347] New: Memory leak loading a shared library built with --static-libsdtc++ when version script is used gyunaev at ulduzsoft dot com 2023-09-08 22:01 ` [Bug libstdc++/111347] " pinskia at gcc dot gnu.org 2023-09-09 1:28 ` gyunaev at ulduzsoft dot com 2023-09-09 4:49 ` gyunaev at ulduzsoft dot com 2023-09-11 11:18 ` redi at gcc dot gnu.org
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