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-rw-r--r--src/basic/cgroup-util.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index 6b3162a35f..2a6dc2769b 100644
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -321,6 +321,14 @@ int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char
if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
continue;
+ /* Ignore kernel threads. Since they can only
+ * exist in the root cgroup, we only check for
+ * them there. */
+ if (cfrom &&
+ (isempty(pfrom) || path_equal(pfrom, "/")) &&
+ is_kernel_thread(pid) > 0)
+ continue;
+
r = cg_attach(cto, pto, pid);
if (r < 0) {
if (ret >= 0 && r != -ESRCH)