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e22de286b1
The functions in virCommand() after fork() must be careful with regard to accessing any mutexes that may have been locked by other threads in the parent process. It is possible that another thread in the parent process holds the lock for the virQEMUDriver while fork() is called. This leads to a deadlock in the child process when 'virQEMUDriverGetConfig(driver)' is called and therefore the handshake never completes between the child and the parent process. Ultimately the virDomainObjectPtr will never be unlocked. It gets much worse if the other thread of the parent process, that holds the lock for the virQEMUDriver, tries to lock the already locked virDomainObject. This leads to a completely unresponsive libvirtd. It's possible to reproduce this case with calling 'virsh start XXX' and 'virsh managedsave XXX' in a tight loop for multiple domains. This commit fixes the deadlock in the same way as it is described in commit 61b52d2e3813cc8c9ff3ab67f232bd0c65f7318d. Signed-off-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com> Reviewed-by: Boris Fiuczynski <fiuczy@linux.vnet.ibm.com>
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>