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-rw-r--r--src/log/log_slot.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/src/log/log_slot.c b/src/log/log_slot.c
index b7efb1d9018..47071211450 100644
--- a/src/log/log_slot.c
+++ b/src/log/log_slot.c
@@ -94,6 +94,17 @@ retry:
if (WT_LOG_SLOT_DONE(new_state))
*releasep = 1;
slot->slot_end_lsn = slot->slot_start_lsn;
+ /*
+ * A thread setting the unbuffered flag sets the unbuffered size after
+ * setting the flag. There could be a delay between a thread setting
+ * the flag, a thread closing the slot, and the original thread setting
+ * that value. If the state is unbuffered, wait for the unbuffered
+ * size to be set.
+ */
+ while (WT_LOG_SLOT_UNBUFFERED_ISSET(old_state) &&
+ slot->slot_unbuffered == 0)
+ __wt_yield();
+
end_offset =
WT_LOG_SLOT_JOINED_BUFFERED(old_state) + slot->slot_unbuffered;
slot->slot_end_lsn.l.offset += (uint32_t)end_offset;