# HG changeset patch
# User Sergey Kandaurov <pluknet@nginx.com>
# Date 1601550637 -3600
# Node ID 4983357258d78e4676f42af81f8df312271b70b7
# Parent  9588a2782c62225632d85488303e3e56f8294ea0
QUIC: a bandaid for calculating ack_delay with non-monotonic time.

diff -r 9588a2782c62 -r 4983357258d7 src/event/ngx_event_quic.c
--- a/src/event/ngx_event_quic.c	Thu Oct 01 12:10:22 2020 +0100
+++ b/src/event/ngx_event_quic.c	Thu Oct 01 12:10:37 2020 +0100
@@ -2265,6 +2265,7 @@
         ngx_gettimeofday(&tv);
         ack_delay = (tv.tv_sec - received->tv_sec) * 1000000
                     + tv.tv_usec - received->tv_usec;
+        ack_delay = ngx_max(ack_delay, 0);
         ack_delay >>= c->quic->ctp.ack_delay_exponent;
     }