Prevent expirations and evictions while paused

Proposed fix to https://github.com/antirez/redis/issues/4027

1 files changed, 6 insertions, 0 deletions

diff --git a/src/evict.c b/src/evict.c
index bf5bea6b0..77f63cba5 100644
--- a/src/evict.c
+++ b/src/evict.c
@@ -380,6 +380,12 @@ int freeMemoryIfNeeded(void) {
     long long delta;
     int slaves = listLength(server.slaves);
 
+    /* We cannot free memory while clients are paused as this will require
+     * evictions which modify the dataset and will break the guarantee that
+     * data will be static while clients are paused. */
+    if (clientsArePaused())
+        goto cant_free;
+
     /* Check if we are over the memory usage limit. If we are not, no need
      * to subtract the slaves output buffers. We can just return ASAP. */
     mem_reported = zmalloc_used_memory();