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-rw-r--r--src/os_unix.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/os_unix.c b/src/os_unix.c
index 1b18e874e..55f220ea9 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -4288,6 +4288,7 @@ static int unixShmSystemLock(
/* Access to the unixShmNode object is serialized by the caller */
pShmNode = pFile->pInode->pShmNode;
assert( pShmNode->nRef==0 || sqlite3_mutex_held(pShmNode->pShmMutex) );
+ assert( pShmNode->nRef>0 || unixMutexHeld() );
/* Shared locks never span more than one byte */
assert( n==1 || lockType!=F_RDLCK );