d75f865fb9
This commit aims to fix https://bugzilla.redhat.com/show_bug.cgi?id=1610207 The cause was apparently incorrect handling of jobs in snapshot revert code which allowed a thread executing snapshot delete to begin job while snapshot revert was still running on another thread. The snapshot delete thread then waited on a condition variable in qemuMonitorSend() while the revert thread finished, changing (and effectively corrupting) the qemuMonitor structure under the delete thread which led to its crash. The incorrect handling of jobs in revert code was due to the fact that although qemuDomainRevertToSnapshot() correctly begins a job at the start, the job was implicitly ended when qemuProcessStop() was called because the job lives in the QEMU driver's private data (qemuDomainObjPrivate) that was purged during qemuProcessStop(). This fix prevents qemuProcessStop() from clearing jobs as the idea of qemuProcessStop() clearing jobs seems wrong in the first place. It was (inadvertently) introduced in commit 888aa4b6b9db65e3db273341e79846, which is effectively reverted by the second hunk of this commit. To preserve the desired effects of the faulty commit, the first hunk is included as suggested by Michal. Signed-off-by: Pavel Mores <pmores@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@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
Libvirt uses the GNU Autotools build system, so in general can be built and installed with the usual commands, however, we mandate to have the build directory different than the source directory. For example, to build in a manner that is suitable for installing as root, use:
$ mkdir build && cd build
$ ../configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var
$ make
$ sudo make install
While to build & install as an unprivileged user
$ mkdir build && cd build
$ ../configure --prefix=$HOME/usr
$ make
$ make install
The libvirt code relies on a large number of 3rd party libraries. These will
be detected during execution of the configure script and a summary printed
which lists any missing (optional) dependencies.
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:
- libvirt-users@redhat.com (for user discussions)
- libvir-list@redhat.com (for development only)
Further details on contacting the project are available on the website: