Tal Nisan has submitted this change and it was merged. Change subject: core: Register OVF_STORE disk at the end of the transaction. ...................................................................... core: Register OVF_STORE disk at the end of the transaction. It appears that in some of the postgresql server versions (9.2.18 for example) a dead lock might occur when attaching a storage domain that gets upgraded (For example from V3 to V4). the reason for this dead lock is that AttachStorageDomainToPoolCommand creates a new transaction and updates the format version of the storage domain. As part of this transaction it also calls RegisterDiskCommand to register the OVF_STORE disks of the storage doman, RegisterDiskCommand also opens a new transaction and tries to insert data into image_storage_domain_map table. Because the new thread in RegisterDiskCommand waits for the lock, which was aquired as part of the update format, to be freed, the engine encounters a DB dead lock. Therefore changing the order of the actions in the trnsaction so the register of the disks will be before the version update should avoid this deadlock. Change-Id: If06cf896c07077e52c71ad33daf1508b3b2c7c86 Bug-Url: https://bugzilla.redhat.com/1446878 Signed-off-by: Maor Lipchuk <mlipchuk(a)redhat.com&gt; --- M backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/storage/domain/AttachStorageDomainToPoolCommand.java 1 file changed, 3 insertions(+), 2 deletions(-) Approvals: Jenkins CI: Passed CI tests Allon Mureinik: Looks good to me, approved Maor Lipchuk: Verified -- To view, visit https://gerrit.ovirt.org/77000 To unsubscribe, visit https://gerrit.ovirt.org/settings Gerrit-MessageType: merged Gerrit-Change-Id: If06cf896c07077e52c71ad33daf1508b3b2c7c86 Gerrit-PatchSet: 2 Gerrit-Project: ovirt-engine Gerrit-Branch: ovirt-engine-4.1 Gerrit-Owner: Maor Lipchuk <mlipchuk(a)redhat.com&gt; Gerrit-Reviewer: Allon Mureinik <amureini(a)redhat.com&gt; Gerrit-Reviewer: Jenkins CI Gerrit-Reviewer: Liron Aravot <laravot(a)redhat.com&gt; Gerrit-Reviewer: Maor Lipchuk <mlipchuk(a)redhat.com&gt; Gerrit-Reviewer: Tal Nisan <tnisan(a)redhat.com&gt; Gerrit-Reviewer: gerrit-hooks <automation(a)ovirt.org&gt;