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From 2c13d8bd00f1e8ff30e9fc81f183f6450303ac30 Mon Sep 17 00:00:00 2001
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From: Alexey Tikhonov <atikhono@redhat.com>
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Date: Wed, 11 Dec 2019 18:42:49 +0100
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Subject: [PATCH] util/watchdog: fixed watchdog implementation
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In case watchdog detected locked process and this process was parent
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process it just sent SIGTERM to the whole group of processes, including
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itself.
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This handling was wrong: generic `server_setup()` installs custom
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libtevent handler for SIGTERM signal so this signal is only processed
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in the context of tevent mainloop. But if tevent mainloop is stuck
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(exactly the case that triggers WD) then event is not processed
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and this made watchdog useless.
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`watchdog_handler()` and `watchdog_detect_timeshift()` were amended to do
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unconditional `_exit()` after optionally sending a signal to the group.
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Resolves: https://pagure.io/SSSD/sssd/issue/4089
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Reviewed-by: Sumit Bose <sbose@redhat.com>
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---
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src/util/util_watchdog.c | 6 ++----
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1 file changed, 2 insertions(+), 4 deletions(-)
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diff --git a/src/util/util_watchdog.c b/src/util/util_watchdog.c
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index a07275b19..38c248271 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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@@ -54,9 +54,8 @@ static void watchdog_detect_timeshift(void)
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if (write(watchdog_ctx.pipefd[1], "1", 1) != 1) {
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if (getpid() == getpgrp()) {
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kill(-getpgrp(), SIGTERM);
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- } else {
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- _exit(1);
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}
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+ _exit(1);
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}
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}
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}
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@@ -75,9 +74,8 @@ static void watchdog_handler(int sig)
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if (__sync_add_and_fetch(&watchdog_ctx.ticks, 1) > WATCHDOG_MAX_TICKS) {
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if (getpid() == getpgrp()) {
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kill(-getpgrp(), SIGTERM);
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- } else {
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- _exit(1);
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}
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+ _exit(1);
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}
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}
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--
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2.20.1
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