valgrind with remote gdb

I believe you can connect gdb to a running valgrind process, and instruct it to run a leak check explicitly.

I haven't tried this, just seen it in the docs.

In case of link breakage:

Connecting GDB to a Valgrind gdbserver

$ valgrind --tool=memcheck --vgdb=yes --vgdb-error=0 ./prog
(the error parameter is the number of errors before the gdbserver becomes active: zero means it starts running right away).

Then start gdb on your program and connect to the remote target

$ gdb ./prog
(gdb) target remote | vgdb
and to trigger the check

(gdb) monitor leak_check full reachable any
See your docs or the linked ones for full details.