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-rw-r--r--linux-user/mmap.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index 44b53bd446..a5dfb56545 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -36,6 +36,7 @@ void mmap_lock(void)
 
 void mmap_unlock(void)
 {
+    assert(mmap_lock_count > 0);
     if (--mmap_lock_count == 0) {
         pthread_mutex_unlock(&mmap_mutex);
     }