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From f57ee0c7862260f3c7054b224f360cdef5140685 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Tue, 19 May 2015 16:00:24 +0200
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Subject: [PATCH] core: enforce a ratelimiter when stopping units due to
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StopWhenUnneeded=1
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Otherwise we might end up in an endless stop loop.
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http://lists.freedesktop.org/archives/systemd-devel/2015-April/030224.html
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(cherry picked from commit bea355dac94e82697aa98e25d80ee4248263bf92)
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(cherry picked from commit 6c72a575c7c61e17c8e96b23042f7b4a5ac39339)
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Related: #1810576
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---
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src/core/unit.c | 10 ++++++++++
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src/core/unit.h | 3 +++
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2 files changed, 13 insertions(+)
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diff --git a/src/core/unit.c b/src/core/unit.c
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index eff9fdbe70..583b9fae28 100644
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--- a/src/core/unit.c
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+++ b/src/core/unit.c
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@@ -97,6 +97,8 @@ Unit *unit_new(Manager *m, size_t size) {
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u->on_failure_job_mode = JOB_REPLACE;
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u->sigchldgen = 0;
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+ RATELIMIT_INIT(u->check_unneeded_ratelimit, 10 * USEC_PER_SEC, 16);
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+
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return u;
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}
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@@ -1594,6 +1596,14 @@ static void unit_check_unneeded(Unit *u) {
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if (unit_active_or_pending(other))
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return;
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+ /* If stopping a unit fails continously we might enter a stop
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+ * loop here, hence stop acting on the service being
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+ * unnecessary after a while. */
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+ if (!ratelimit_test(&u->check_unneeded_ratelimit)) {
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+ log_unit_warning(u->id, "Unit not needed anymore, but not stopping since we tried this too often recently.");
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+ return;
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+ }
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+
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log_unit_info(u->id, "Unit %s is not needed anymore. Stopping.", u->id);
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/* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
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diff --git a/src/core/unit.h b/src/core/unit.h
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index 3b0fd8d9df..29353ea81c 100644
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--- a/src/core/unit.h
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+++ b/src/core/unit.h
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@@ -185,6 +185,9 @@ struct Unit {
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/* Error code when we didn't manage to load the unit (negative) */
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int load_error;
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+ /* Make sure we never enter endless loops with the check unneeded logic */
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+ RateLimit check_unneeded_ratelimit;
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+
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/* Cached unit file state and preset */
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UnitFileState unit_file_state;
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int unit_file_preset;
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