1 files changed, 6 insertions, 1 deletions

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index ec01803e0a55..4cb5e5147165 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -3783,12 +3783,17 @@ void
 ring_buffer_read_finish(struct ring_buffer_iter *iter)
 {
         struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+        unsigned long flags;
 
         /*
          * Ring buffer is disabled from recording, here's a good place
-         * to check the integrity of the ring buffer. 
+         * to check the integrity of the ring buffer.
+         * Must prevent readers from trying to read, as the check
+         * clears the HEAD page and readers require it.
          */
+        raw_spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
         rb_check_pages(cpu_buffer);
+        raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 
         atomic_dec(&cpu_buffer->record_disabled);
         atomic_dec(&cpu_buffer->buffer->resize_disabled);