8b133e82fc
I've noticed some tests fail to run under valgrind with the
following error:
$ valgrind --leak-check=full --trace-children=yes ./qemuxmlconftest
valgrind: symbol lookup error: libvirt.git/_build/tests/libdomaincapsmock.so: undefined symbol: virQEMUCapsGet
But without valgrind the test passes just fine. While we usually
don't want to change our code just to adhere to random tools, in
this case we ought to make an exception because valgrind helps us
to detect memory leaks.
NB, the --trace-children=yes is needed whenever a test
re-executes itself, i.e. when it uses mocks. Otherwise we'd just
get (boring) result for the first invocation of main() which does
nothing more than sets up the environment and calls exec().
When running the test binary without valgrind I can see the
libtest_qemu_driver.so being loaded even after exec:
$ LD_DEBUG=libs ./qemuxmlconftest 2>&1 | grep -e libtest_qemu_driver.so -e virQEMUCapsGet
6439: find library=libtest_qemu_driver.so [0]; searching
6439: trying file=libvirt.git/_build/tests/../src/libtest_qemu_driver.so
6439: trying file=libvirt.git/_build/tests/glibc-hwcaps/x86-64-v3/libtest_qemu_driver.so
6439: trying file=libvirt.git/_build/tests/glibc-hwcaps/x86-64-v2/libtest_qemu_driver.so
6439: trying file=libvirt.git/_build/tests/libtest_qemu_driver.so
6439: calling init: libvirt.git/_build/tests/libtest_qemu_driver.so
6439: find library=libtest_qemu_driver.so [0]; searching
6439: trying file=libvirt.git/_build/tests/libtest_qemu_driver.so
6439: calling init: libvirt.git/_build/tests/libtest_qemu_driver.so
6439: calling fini: libvirt.git/_build/tests/libtest_qemu_driver.so [0]
But running the same under valgrind:
$ LD_DEBUG=libs valgrind --leak-check=full --trace-children=yes ./qemuxmlconftest 2>&1 | grep -e libtest_qemu_driver.so -e virQEMUCapsGet
6515: find library=libtest_qemu_driver.so [0]; searching
6515: trying file=libvirt.git/_build/tests/../src/libtest_qemu_driver.so
6515: trying file=libvirt.git/_build/tests/glibc-hwcaps/x86-64-v3/libtest_qemu_driver.so
6515: trying file=libvirt.git/_build/tests/glibc-hwcaps/x86-64-v2/libtest_qemu_driver.so
6515: trying file=libvirt.git/_build/tests/libtest_qemu_driver.so
6515: calling init: libvirt.git/_build/tests/libtest_qemu_driver.so
6515: libvirt.git/_build/tests/libdomaincapsmock.so: error: symbol lookup error: undefined symbol: virQEMUCapsGet (fatal)
valgrind: symbol lookup error: libvirt.git/_build/tests/libdomaincapsmock.so: undefined symbol: virQEMUCapsGet
To me, it looks like valgrind forced linker to lookup symbols
"sooner", as individual libraries are loaded. But I must admit I
have no idea how valgrind does that (or if that's even valgrind's
'fault').
But fix is pretty simple: link mocks that rely on symbols from
the QEMU driver with the QEMU driver, well, its test suite
suitable version (libtest_qemu_driver.so).
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
Libvirt API for virtualization
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
For some of these hypervisors, it provides a stateful management daemon which runs on the virtualization host allowing access to the API both by non-privileged local users and remote users.
Layered packages provide bindings of the libvirt C API into other languages including Python, Perl, PHP, Go, Java, OCaml, as well as mappings into object systems such as GObject, CIM and SNMP.
Further information about the libvirt project can be found on the website:
License
The libvirt C API is distributed under the terms of GNU Lesser General Public License, version 2.1 (or later). Some parts of the code that are not part of the C library may have the more restrictive GNU General Public License, version 2.0 (or later). See the files COPYING.LESSER and COPYING for full license terms & conditions.
Installation
Instructions on building and installing libvirt can be found on the website:
https://libvirt.org/compiling.html
Contributing
The libvirt project welcomes contributions in many ways. For most components the best way to contribute is to send patches to the primary development mailing list. Further guidance on this can be found on the website:
https://libvirt.org/contribute.html
Contact
The libvirt project has two primary mailing lists:
- users@lists.libvirt.org (for user discussions)
- devel@lists.libvirt.org (for development only)
Further details on contacting the project are available on the website: