add backtrace on wait version timeout

src/storage/src/hummock/utils.rs

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+use std::backtrace::Backtrace;
 use std::cmp::Ordering;
 use std::collections::VecDeque;
 use std::fmt::{Debug, Formatter};
@@ -637,6 +638,11 @@ pub(crate) async fn wait_for_update(
     loop {
         match tokio::time::timeout(Duration::from_secs(30), receiver.changed()).await {
             Err(_) => {
+                let backtrace = if cfg!(debug_assertions) {
+                    format!("{:?}", Backtrace::capture())
+                } else {
+                    "backtrace log not enabled in non-debug mode".into()
+                };
                 // The reason that we need to retry here is batch scan in
                 // chain/rearrange_chain is waiting for an
                 // uncommitted epoch carried by the CreateMV barrier, which
@@ -649,6 +655,7 @@ pub(crate) async fn wait_for_update(
                 tracing::warn!(
                     info = periodic_debug_info(),
                     elapsed = ?start_time.elapsed(),
+                    backtrace,
                     "timeout when waiting for version update",
                 );
                 continue;