After running libvirt daemon with valgrind tools, some errors are appearing when you try to start a domain. One example: ==18012== Syscall param mount(type) points to unaddressable byte(s) ==18012== at 0x6FEE3CA: mount (syscall-template.S:78) ==18012== by 0x531344D: virFileMoveMount (virfile.c:3828) ==18012== by 0x27FE7675: qemuDomainBuildNamespace (qemu_domain.c:11501) ==18012== by 0x2800C44E: qemuProcessHook (qemu_process.c:2870) ==18012== by 0x52F7E1D: virExec (vircommand.c:726) ==18012== by 0x52F7E1D: virCommandRunAsync (vircommand.c:2477) ==18012== by 0x52F4EDD: virCommandRun (vircommand.c:2309) ==18012== by 0x2800A731: qemuProcessLaunch (qemu_process.c:6235) ==18012== by 0x2800D6B4: qemuProcessStart (qemu_process.c:6569) ==18012== by 0x28074876: qemuDomainObjStart (qemu_driver.c:7314) ==18012== by 0x280522EB: qemuDomainCreateWithFlags (qemu_driver.c:7367) ==18012== by 0x55484BF: virDomainCreate (libvirt-domain.c:6531) ==18012== by 0x12CDBD: remoteDispatchDomainCreate (remote_daemon_dispatch_stubs.h:4350) ==18012== by 0x12CDBD: remoteDispatchDomainCreateHelper (remote_daemon_dispatch_stubs.h:4326) ==18012== Address 0x0 is not stack'd, malloc'd or (recently) free'd Some documentation recommends to use "none" when you don't have a filesystem type to use. Specially, for bind and move actions. Signed-off-by: Julio Faracco <jcfaracco(a)gmail.com&gt; --- src/util/virfile.c | 2 +- src/util/virprocess.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/src/util/virfile.c b/src/util/virfile.c index 9296ccbe2a..378d03ecf0 100644 --- a/src/util/virfile.c +++ b/src/util/virfile.c @@ -3825,7 +3825,7 @@ virFileMoveMount(const char *src, { const unsigned long mount_flags = MS_MOVE; - if (mount(src, dst, NULL, mount_flags, NULL) < 0) { + if (mount(src, dst, "none", mount_flags, NULL) < 0) { virReportSystemError(errno, _("Unable to move %s mount to %s"), src, dst); diff --git a/src/util/virprocess.c b/src/util/virprocess.c index 1fbbbb3a27..f92b0dce37 100644 --- a/src/util/virprocess.c +++ b/src/util/virprocess.c @@ -1181,7 +1181,7 @@ virProcessSetupPrivateMountNS(void) goto cleanup; } - if (mount("", "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) { + if (mount("", "/", "none", MS_SLAVE|MS_REC, NULL) < 0) { virReportSystemError(errno, "%s", _("Failed to switch root mount into slave mode")); goto cleanup; -- 2.17.1