A CONFIG_MEMCG=y kernel booted with "cgroup_disable=memory" crashes on a NULL memcg (but non-NULL root_mem_cgroup) when vmpressure kicks in. Here's the patch I use to avoid that, but you might prefer a test on mem_cgroup_disabled() somewhere. Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx> --- To be folded in to mm-memcontrol-hook-up-vmpressure-to-socket-pressure.patch if Hannes does not prefer to fix it differently. mm/vmpressure.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- 4.4-next/mm/vmpressure.c 2016-01-06 10:32:21.387741753 -0800 +++ linux/mm/vmpressure.c 2016-01-06 10:48:05.956149779 -0800 @@ -260,7 +260,7 @@ void vmpressure(gfp_t gfp, struct mem_cg enum vmpressure_levels level; /* For now, no users for root-level efficiency */ - if (memcg == root_mem_cgroup) + if (!memcg || memcg == root_mem_cgroup) return; spin_lock(&vmpr->sr_lock); -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>