The issue can be reproduced by using upstream version 7.8.1 and 7.9.2.
However, a slightly modified version of the example works with the
latest release 8.0.0 (Git: https://github.com/jtv/libpqxx , tag
"8.0.0"):
#include <pqxx/pqxx>
int main() {
try {
pqxx::connection c;
} catch(...) { }
return 0;
}
Compile and run: g++ t1.cc -o t1 -std=c++20 -lpqxx && valgrind ./t1
An update to libpqxx-8.0.0 may be the straightforward solution for
Ubuntu 26.04.
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https://bugs.launchpad.net/bugs/2143722
Title:
libpqxx: crash on Ubuntu 26.04 alpha with "free(): double free
detected in tcache 2"
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