Re: [libvirt] [PATCH v3] qemu: qemuDomainRename and virDomainObjListNumOfDomains ABBA deadlock fix

A pretty nasty deadlock occurs while trying to rename a VM in parallel with virDomainObjListNumOfDomains. The short description of the problem is as follows: Thread #1: qemuDomainRename: ------> aquires domain lock by qemuDomObjFromDomain ---------> waits for domain list lock in any of the listed functions: - virDomainObjListFindByName - virDomainObjListRenameAddNew - virDomainObjListRenameRemove Thread #2: virDomainObjListNumOfDomains: ------> aquires domain list lock ---------> waits for domain lock in virDomainObjListCount Introduce generic virDomainObjListRename function for renaming domains. It aquires list lock in right order to avoid deadlock. Callback is used to make driver specific domain updates. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy(a)virtuozzo.com&gt; --- src/conf/virdomainobjlist.c | 98 +++++++++++++++++++----------- src/conf/virdomainobjlist.h | 16 +++-- src/libvirt_private.syms | 3 +- src/qemu/qemu_driver.c | 142 ++++++++++++++++++++------------------------ 4 files changed, 142 insertions(+), 117 deletions(-)