Re: [BUG -next] "random: make /dev/urandom scalable for silly userspace programs" causes crash

[Theodore Ts'o]

On Wed, Jul 27, 2016 at 09:14:00AM +0200, Heiko Carstens wrote:
> it looks like your patch "random: make /dev/urandom scalable for silly
> userspace programs" within linux-next seems to be a bit broken:
> 
> It causes this allocation failure and subsequent crash on s390 with fake
> NUMA enabled

Thanks for reporting this.  This patch fixes things for you, yes?

                                                    - Ted

commit 59b8d4f1f5d26e4ca92172ff6dcd1492cdb39613
Author: Theodore Ts'o <ty...@mit.edu>
Date:   Wed Jul 27 23:30:25 2016 -0400

    random: use for_each_online_node() to iterate over NUMA nodes
    
    This fixes a crash on s390 with fake NUMA enabled.
    
    Reported-by: Heiko Carstens <heiko.carst...@de.ibm.com>
    Fixes: 1e7f583af67b ("random: make /dev/urandom scalable for silly 
userspace programs")
    Signed-off-by: Theodore Ts'o <ty...@mit.edu>

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 8d0af74..7f06224 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1668,13 +1668,12 @@ static int rand_initialize(void)
 #ifdef CONFIG_NUMA
        pool = kmalloc(num_nodes * sizeof(void *),
                       GFP_KERNEL|__GFP_NOFAIL|__GFP_ZERO);
-       for (i=0; i < num_nodes; i++) {
+       for_each_online_node(i) {
                crng = kmalloc_node(sizeof(struct crng_state),
                                    GFP_KERNEL | __GFP_NOFAIL, i);
                spin_lock_init(&crng->lock);
                crng_initialize(crng);
                pool[i] = crng;
-
        }
        mb();
        crng_node_pool = pool;