SERVER-23066 Make killOp accept negative opid

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mongo/db/commands/kill_op.cpp b/src/mongo/db/commands/kill_op.cpp
index bd0555b9364..baaf8106220 100644
--- a/src/mongo/db/commands/kill_op.cpp
+++ b/src/mongo/db/commands/kill_op.cpp
@@ -81,6 +81,12 @@ public:
         log() << "going to kill op: " << op;
         result.append("info", "attempting to kill op");
 
+        // Internally opid is an unsigned 32-bit int, but as BSON only has signed integer types,
+        // we wrap values exceeding 2,147,483,647 to negative numbers. The following undoes this
+        // transformation, so users can use killOp on the (negative) opid they received.
+        if (op >= std::numeric_limits<int>::min() && op < 0)
+            op += 1ull << 32;
+
         uassert(26823,
                 str::stream() << "invalid op : " << op,
                 (op >= 0) && (op <= std::numeric_limits<unsigned int>::max()));