Resolves: rhbz#2218858 - [sssd] SSSD enters failed state after heavy load in the system
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Alexey Tikhonov
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From 2cd5a6a2c8fd1826177d6bb51e7d4f4ad368bcfb Mon Sep 17 00:00:00 2001
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From: Sumit Bose <sbose@redhat.com>
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Date: Fri, 9 Jun 2023 12:31:39 +0200
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Subject: [PATCH 1/2] watchdog: add arm_watchdog() and disarm_watchdog() calls
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Those two new calls can be used if there are requests stuck by e.g.
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waiting on replies where there is no other way to handle the timeout and
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get the system back into a stable state. They should be only used as a
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last resort.
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Resolves: https://github.com/SSSD/sssd/issues/6803
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Reviewed-by: Alexey Tikhonov <atikhono@redhat.com>
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Reviewed-by: Pavel Březina <pbrezina@redhat.com>
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(cherry picked from commit 75f2b35ad3b9256de905d05c5108400d35688554)
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---
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src/util/util.h | 12 ++++++++++++
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src/util/util_watchdog.c | 28 ++++++++++++++++++++++++++--
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2 files changed, 38 insertions(+), 2 deletions(-)
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diff --git a/src/util/util.h b/src/util/util.h
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index a8356e0cd..9dbcf3301 100644
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--- a/src/util/util.h
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+++ b/src/util/util.h
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@@ -756,6 +756,18 @@ int setup_watchdog(struct tevent_context *ev, int interval);
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void teardown_watchdog(void);
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int get_watchdog_ticks(void);
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+/* The arm_watchdog() and disarm_watchdog() calls will disable and re-enable
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+ * the watchdog reset, respectively. This means that after arm_watchdog() is
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+ * called the watchdog will not be resetted anymore and it will kill the
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+ * process if disarm_watchdog() wasn't called before.
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+ * Those calls should only be used when there is no other way to handle
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+ * waiting request and recover into a stable state.
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+ * Those calls cannot be nested, i.e. after calling arm_watchdog() it should
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+ * not be called a second time in a different request because then
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+ * disarm_watchdog() will disable the watchdog coverage for both. */
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+void arm_watchdog(void);
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+void disarm_watchdog(void);
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+
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/* from files.c */
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int sss_remove_tree(const char *root);
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int sss_remove_subtree(const char *root);
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diff --git a/src/util/util_watchdog.c b/src/util/util_watchdog.c
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index b1534e499..abafd94b9 100644
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--- a/src/util/util_watchdog.c
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+++ b/src/util/util_watchdog.c
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@@ -40,6 +40,7 @@ struct watchdog_ctx {
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time_t timestamp;
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struct tevent_fd *tfd;
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int pipefd[2];
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+ bool armed; /* if 'true' ticks counter will not be reset */
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} watchdog_ctx;
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static void watchdog_detect_timeshift(void)
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@@ -89,8 +90,13 @@ static void watchdog_event_handler(struct tevent_context *ev,
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struct timeval current_time,
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void *private_data)
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{
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- /* first thing reset the watchdog ticks */
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- watchdog_reset();
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+ if (!watchdog_ctx.armed) {
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+ /* first thing reset the watchdog ticks */
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+ watchdog_reset();
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+ } else {
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+ DEBUG(SSSDBG_IMPORTANT_INFO,
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+ "Watchdog armed, process might be terminated soon.\n");
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+ }
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/* then set a new watchodg event */
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watchdog_ctx.te = tevent_add_timer(ev, ev,
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@@ -197,6 +203,7 @@ int setup_watchdog(struct tevent_context *ev, int interval)
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watchdog_ctx.ev = ev;
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watchdog_ctx.input_interval = interval;
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watchdog_ctx.timestamp = time(NULL);
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+ watchdog_ctx.armed = false;
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ret = pipe(watchdog_ctx.pipefd);
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if (ret == -1) {
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@@ -264,3 +271,20 @@ int get_watchdog_ticks(void)
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{
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return __sync_add_and_fetch(&watchdog_ctx.ticks, 0);
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}
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+
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+void arm_watchdog(void)
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+{
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+ if (watchdog_ctx.armed) {
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+ DEBUG(SSSDBG_CRIT_FAILURE,
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+ "arm_watchdog() is called although the watchdog is already armed. "
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+ "This indicates a programming error and should be avoided because "
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+ "it will most probably not work as expected.\n");
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+ }
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+
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+ watchdog_ctx.armed = true;
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+}
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+
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+void disarm_watchdog(void)
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+{
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+ watchdog_ctx.armed = false;
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+}
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--
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2.38.1
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@ -0,0 +1,53 @@
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From 55564defec8fdbb4d9df6b0124a8b18b31743230 Mon Sep 17 00:00:00 2001
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From: Sumit Bose <sbose@redhat.com>
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Date: Fri, 9 Jun 2023 13:01:47 +0200
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Subject: [PATCH 2/2] sbus: arm watchdog for sbus_connect_init_send()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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There seem to be conditions where the reply in the
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sbus_call_DBus_Hello_send() request gets lost and the backend cannot
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properly initialize its sbus/DBus server. Since the backend cannot be
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connected by the frontends in this state the best way to recover would
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be a restart. Since the event-loop is active in this state, e.g. waiting
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for the reply, the watchdog will not consider the process as hung and
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will not restart the process.
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To make the watchdog handle this case arm_watchdog() and
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disarm_watchdog() are called before and after the request, respectively.
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Resolves: https://github.com/SSSD/sssd/issues/6803
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Reviewed-by: Alexey Tikhonov <atikhono@redhat.com>
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Reviewed-by: Pavel Březina <pbrezina@redhat.com>
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(cherry picked from commit cca9361d92501e0be34d264d370fe897a0c970af)
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---
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src/sbus/connection/sbus_connection_connect.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/src/sbus/connection/sbus_connection_connect.c b/src/sbus/connection/sbus_connection_connect.c
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index 45a0fa491..edc090e15 100644
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--- a/src/sbus/connection/sbus_connection_connect.c
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+++ b/src/sbus/connection/sbus_connection_connect.c
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@@ -67,6 +67,8 @@ sbus_connect_init_send(TALLOC_CTX *mem_ctx,
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tevent_req_set_callback(subreq, sbus_connect_init_hello_done, req);
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+ arm_watchdog();
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+
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return req;
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}
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@@ -111,6 +113,8 @@ static void sbus_connect_init_done(struct tevent_req *subreq)
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uint32_t res;
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errno_t ret;
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+ disarm_watchdog();
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+
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req = tevent_req_callback_data(subreq, struct tevent_req);
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ret = sbus_call_DBus_RequestName_recv(subreq, &res);
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--
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2.38.1
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@ -27,14 +27,15 @@
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Name: sssd
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Version: 2.9.1
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Release: 1%{?dist}
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Release: 2%{?dist}
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Summary: System Security Services Daemon
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License: GPLv3+
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URL: https://github.com/SSSD/sssd/
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Source0: https://github.com/SSSD/sssd/releases/download/%{version}/sssd-%{version}.tar.gz
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### Patches ###
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#Patch0001:
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Patch0001: 0001-watchdog-add-arm_watchdog-and-disarm_watchdog-calls.patch
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Patch0002: 0002-sbus-arm-watchdog-for-sbus_connect_init_send.patch
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### Dependencies ###
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@ -1061,6 +1062,9 @@ fi
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%systemd_postun_with_restart sssd.service
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%changelog
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* Mon Jul 10 2023 Alexey Tikhonov <atikhono@redhat.com> - 2.9.1-2
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- Resolves: rhbz#2218858 - [sssd] SSSD enters failed state after heavy load in the system
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* Fri Jun 23 2023 Alexey Tikhonov <atikhono@redhat.com> - 2.9.1-1
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- Resolves: rhbz#2167837 - Rebase SSSD for RHEL 9.3
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- Resolves: rhbz#2196816 - [RHEL9] [sssd] User lookup on IPA client fails with 's2n get_fqlist request failed'
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