BPF syscall BPF_MAP_GET_NEXT_KEY returns -1 if something fails but it will also return -1 if trying to get next key using the last key in the map with errno set to ENOENT. If there are VMs running and libvirtd is restarted and user tries to call some cgroup devices operation on a VM we need to get the count of entries in BPF map and it fails which will result in error when trying to attach/detech devices. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1833321 Signed-off-by: Pavel Hrdina <phrdina@xxxxxxxxxx> --- src/util/vircgroupv2devices.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/util/vircgroupv2devices.c b/src/util/vircgroupv2devices.c index d62ee12a05..234e0f2278 100644 --- a/src/util/vircgroupv2devices.c +++ b/src/util/vircgroupv2devices.c @@ -342,7 +342,7 @@ virCgroupV2DevicesCountMapEntries(int mapfd) prevKey = key; } - if (rc < 0) + if (rc < 0 && errno != ENOENT) return -1; return ret; -- 2.26.2
