Merge pull request #51828 from petrutlucian94/it_decrement_issue

librbd: avoid decrementing iterator before first element Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
ceph · May 31, 2023 · a5483da · a5483da
2 parents 0e90958 + ca65e85
commit a5483da
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/librbd/io/SimpleSchedulerObjectDispatch.cc b/src/librbd/io/SimpleSchedulerObjectDispatch.cc
@@ -105,7 +105,8 @@ bool SimpleSchedulerObjectDispatch<I>::ObjectRequests::try_delay_request(
 
     // try to merge back to an existing request
     iter = m_delayed_requests.lower_bound(object_off);
-    if (iter == m_delayed_requests.end() || iter->first > object_off) {
+    if (iter != m_delayed_requests.begin() &&
+        (iter == m_delayed_requests.end() || iter->first > object_off)) {
       iter--;
     }
     if (iter != m_delayed_requests.end() &&