Fix null pointer in arc_kmem_reap_now on 32-bit

On 32 bit system, zio_buf_cache is limit to 1M. Larger than that is all NULL. So we need to avoid reaping them. Signed-off-by: Chunwei Chen <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue openzfs#3973
ka7 · Nov 20, 2015 · d0c614e · d0c614e
1 parent d287880
commit d0c614e
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/module/zfs/arc.c b/module/zfs/arc.c
@@ -3373,6 +3373,11 @@ arc_kmem_reap_now(void)
 	}
 
 	for (i = 0; i < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; i++) {
+#ifdef _ILP32
+		/* reach upper limit of cache size on 32-bit */
+		if (zio_buf_cache[i] == NULL)
+			break;
+#endif
 		if (zio_buf_cache[i] != prev_cache) {
 			prev_cache = zio_buf_cache[i];
 			kmem_cache_reap_now(zio_buf_cache[i]);