anitazha / rpms / systemd

Forked from rpms/systemd 3 years ago
Clone

Blame SOURCES/0749-core-timer-Prevent-timer-looping-when-unit-cannot-st.patch

9ab0c5
From d7eac3e0ae20510e2737dc4e23975391fef5ece3 Mon Sep 17 00:00:00 2001
9ab0c5
From: =?UTF-8?q?Michal=20Koutn=C3=BD?= <mkoutny@suse.com>
9ab0c5
Date: Tue, 16 Jan 2018 19:22:46 +0100
9ab0c5
Subject: [PATCH] core/timer: Prevent timer looping when unit cannot start
9ab0c5
9ab0c5
When a unit job finishes early (e.g. when fork(2) fails) triggered unit goes
9ab0c5
through states
9ab0c5
        stopped->failed (or failed->failed),
9ab0c5
in case a ExecStart= command fails unit passes through
9ab0c5
        stopped->starting->failed.
9ab0c5
9ab0c5
The former transition doesn't result in unit active/inactive timestamp being
9ab0c5
updated and timer (OnUnitActiveSec= or OnUnitInactiveSec=) would use an expired
9ab0c5
timestamp triggering immediately again (repeatedly).
9ab0c5
9ab0c5
This patch exploits timer's last trigger timestamp to ensure the timer isn't
9ab0c5
triggered more frequently than OnUnitActiveSec=/OnUnitInactiveSec= period.
9ab0c5
9ab0c5
Steps to reproduce:
9ab0c5
9ab0c5
0) Create sample units:
9ab0c5
9ab0c5
cat >~/.config/systemd/user/looper.service <
9ab0c5
[Service]
9ab0c5
ExecStart=/usr/bin/sleep 2
9ab0c5
EOD
9ab0c5
9ab0c5
cat >~/.config/systemd/user/looper.timer <
9ab0c5
[Timer]
9ab0c5
AccuracySec=5
9ab0c5
OnUnitActiveSec=5
9ab0c5
EOD
9ab0c5
9ab0c5
1) systemctl --user daemon-reload
9ab0c5
9ab0c5
2) systemctl --user start looper.timer
9ab0c5
   # to have first activation timestamp/sentinel
9ab0c5
   systemctl --user start looper.service
9ab0c5
9ab0c5
o  Observe the service is being regularly triggered.
9ab0c5
9ab0c5
3) systemctl set-property user@$UID.service TasksMax=2
9ab0c5
9ab0c5
o  Observe the tight looping as long as the looper.service cannot be started.
9ab0c5
9ab0c5
Ref: #5969
9ab0c5
9ab0c5
(cherry picked from commit 204d140c4def364c47d36226e4514a7e077fa196)
9ab0c5
(cherry picked from commit fe81f6f734ee46a4877df6dda6e31cdc24c00a3c)
9ab0c5
9ab0c5
Resolves: #1729230
9ab0c5
---
9ab0c5
 src/core/timer.c | 2 ++
9ab0c5
 1 file changed, 2 insertions(+)
9ab0c5
9ab0c5
diff --git a/src/core/timer.c b/src/core/timer.c
9ab0c5
index d32b007c7c..1d4868643a 100644
9ab0c5
--- a/src/core/timer.c
9ab0c5
+++ b/src/core/timer.c
9ab0c5
@@ -416,6 +416,7 @@ static void timer_enter_waiting(Timer *t, bool initial) {
9ab0c5
 
9ab0c5
                                 if (base <= 0)
9ab0c5
                                         continue;
9ab0c5
+                                base = MAX(base, t->last_trigger.monotonic);
9ab0c5
 
9ab0c5
                                 break;
9ab0c5
 
9ab0c5
@@ -428,6 +429,7 @@ static void timer_enter_waiting(Timer *t, bool initial) {
9ab0c5
 
9ab0c5
                                 if (base <= 0)
9ab0c5
                                         continue;
9ab0c5
+                                base = MAX(base, t->last_trigger.monotonic);
9ab0c5
 
9ab0c5
                                 break;
9ab0c5