@@ -115,7 +115,10 @@ mod _pickle {
 
         #[pymethod]
         fn release(zelf: &Py<Self>) {
-            *zelf.buffer.write() = None;
+            // Releasing the last share can invoke Python's __release_buffer__.
+            // Publish the released state and drop the lock before that callback.
+            let buffer = zelf.buffer.write().take();
+            drop(buffer);
         }
     }
Original file line number	Diff line number	Diff line change
`@@ -115,7 +115,10 @@ mod _pickle {`
`115`	`115`
`116`	`116`	`#[pymethod]`
`117`	`117`	`fn release(zelf: &Py<Self>) {`
`118`		`- *zelf.buffer.write() = None;`
	`118`	`+ // Releasing the last share can invoke Python's __release_buffer__.`
	`119`	`+ // Publish the released state and drop the lock before that callback.`
	`120`	`+ let buffer = zelf.buffer.write().take();`
	`121`	`+ drop(buffer);`
`119`	`122`	`}`
`120`	`123`	`}`
`121`	`124`