1 files changed, 11 insertions, 0 deletions

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 3b277b4eaa95..c5345a951820 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -20,6 +20,7 @@
 #include <linux/cache.h>
 #include <linux/sched/sysctl.h>
 #include <linux/delay.h>
+#include <linux/crash_dump.h>
 
 #include <trace/events/block.h>
 
@@ -1742,6 +1743,16 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
         if (!ctx)
                 return ERR_PTR(-ENOMEM);
 
+        /*
+         * If a crashdump is active, then we are potentially in a very
+         * memory constrained environment. Limit us to 1 queue and
+         * 64 tags to prevent using too much memory.
+         */
+        if (is_kdump_kernel()) {
+                set->nr_hw_queues = 1;
+                set->queue_depth = min(64U, set->queue_depth);
+        }
+
         hctxs = kmalloc_node(set->nr_hw_queues * sizeof(*hctxs), GFP_KERNEL,
                         set->numa_node);