There was an unhandled 'open' call which resulted in: "error: Library function returned error but did not set virError" Even if this happens during the daemon's start when we still don't have any set of outputs defined yet, we can safely report an error, since we automatically fallback to stderr which is fine even for both running as a daemonized process, since this happens before the daemon forks into the background, and running as a systemd service, since systemd re-directs std outputs to journald by default. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1436060 Signed-off-by: Erik Skultety <eskultet(a)redhat.com&gt; --- src/util/virlog.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/util/virlog.c b/src/util/virlog.c index 7b584f8e37..7933e1a7a0 100644 --- a/src/util/virlog.c +++ b/src/util/virlog.c @@ -750,8 +750,10 @@ virLogNewOutputToFile(virLogPriority priority, virLogOutputPtr ret = NULL; fd = open(file, O_CREAT | O_APPEND | O_WRONLY, S_IRUSR | S_IWUSR); - if (fd < 0) + if (fd < 0) { + virReportSystemError(errno, _("failed to open %s"), file); return NULL; + } if (!(ret = virLogOutputNew(virLogOutputToFd, virLogCloseFd, (void *)(intptr_t)fd,