https://bugzilla.redhat.com/show_bug.cgi?id=1495511 When creating new /dev for domain ran in namespace we try to preserve all sub-mounts of /dev. Well, not quite all. For instance if /dev/foo/bar and /dev/foo are both mount points, only /dev/foo needs preserving. /dev/foo/bar is preserved with it too. Now, to identify such cases like this one STRPREFIX() is used. That is not good enough. While it works for [/dev/foo/bar; /dev/foo] case, it fails for [/dev/prefix; /dev/prefix2] where the strings share the same prefix but are in fact two different paths. The solution is to use STRSKIP(). Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/qemu/qemu_domain.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index 05e8b96aa..8aa66c69c 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -8182,7 +8182,9 @@ qemuDomainGetPreservedMounts(virQEMUDriverConfigPtr cfg, for (i = 1; i < nmounts; i++) { j = i + 1; while (j < nmounts) { - if (STRPREFIX(mounts[j], mounts[i])) { + char *c = STRSKIP(mounts[j], mounts[i]); + + if (c && *c == '/') { VIR_DEBUG("Dropping path %s because of %s", mounts[j], mounts[i]); VIR_DELETE_ELEMENT(mounts, j, nmounts); } else { -- 2.13.6