From: Pavel Rochnyack <pavel2000@ngs.ru>
Date: Wed, 19 Dec 2018 12:57:04 +0000 (+0700)
Subject: processes: Fix 'delay_rate' race condition
X-Git-Url: https://git.octo.it/?p=collectd.git;a=commitdiff_plain;h=c5e7240d111bacb9c398c44a5f9825782970e59d

processes: Fix 'delay_rate' race condition

When ts_delay_by_tgid() failed (for example, when observable process
terminates), `ps->delay` fields are not updated and remain set to zero.

This interpreted as counter overflow and produces spike.

Issue: #3026
---

diff --git a/src/processes.c b/src/processes.c
index ce4cc652..171dde95 100644
--- a/src/processes.c
+++ b/src/processes.c
@@ -587,7 +587,8 @@ static void ps_list_add(const char *name, const char *cmdline,
                       entry->cpu_system_counter);
 
 #if HAVE_LIBTASKSTATS
-    ps_update_delay(ps, pse, entry);
+    if (entry->has_delay)
+      ps_update_delay(ps, pse, entry);
 #endif
   }
 }