Avoid underflow

1 files changed, 5 insertions, 1 deletions

diff --git a/searchcore/src/vespa/searchcore/proton/matching/matcher.cpp b/searchcore/src/vespa/searchcore/proton/matching/matcher.cpp
index cf7cbe9b8d9..d68c5a667ac 100644
--- a/searchcore/src/vespa/searchcore/proton/matching/matcher.cpp
+++ b/searchcore/src/vespa/searchcore/proton/matching/matcher.cpp
@@ -317,7 +317,11 @@ Matcher::match(const SearchRequest &request, vespalib::ThreadBundle &threadBundl
         if (my_stats.softDoomed()) {
             double old = _stats.softDoomFactor();
             fastos::TimeStamp softLimit = uint64_t((1.0 - _rankSetup->getSoftTimeoutTailCost()) * request.getTimeout());
-            _stats.updatesoftDoomFactor(request.getTimeout(), softLimit, duration - my_stats.doomOvertime());
+            fastos::TimeStamp adjustedDuration = duration - my_stats.doomOvertime();
+            if (adjustedDuration < 0) {
+                adjustedDuration = 0;
+            }
+            _stats.updatesoftDoomFactor(request.getTimeout(), softLimit, adjustedDuration);
             LOG(info, "Triggered softtimeout factor adjustment. request=%1.3f, doomOvertime=%1.3f, limit=%1.3f and duration=%1.3f, rankprofile=%s"
                       ", factor adjusted from %1.3f to %1.3f",
                 request.getTimeout().sec(), my_stats.doomOvertime().sec(), softLimit.sec(), duration.sec(),