From 9b84c7f959dca7b14dde522a443a3fcf2f5c5c2d Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Tue, 1 Sep 2015 17:53:14 +0200 Subject: [PATCH] cgroup: never migrate kernel threads out of the root cgroup It won't work anyway. --- src/basic/cgroup-util.c | 8 ++++++++ 1 file changed, 8 insertions(+) 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)