Output debug info, if assertion fails (cherry picked from commit 4fa4dc058a817434135308b11d0de7508f7b53f8)
Output debug info, if assertion fails
(cherry picked from commit 4fa4dc058a817434135308b11d0de7508f7b53f8)

uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend