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From 645e628626f4a3d4b662c067584b4efc6b5c70c5 Mon Sep 17 00:00:00 2001
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From: William Brown <firstyear@redhat.com>
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Date: Wed, 15 Mar 2017 10:46:38 +1000
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Subject: [PATCH 5/5] Ticket 49171 - Nunc Stans incorrectly reports a timeout
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Bug Description: In some cases nunc-stans would incorrectly report
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and IO timeout.
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Fix Description: Make the io output type volatile to prevent re-arranging
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of the code. We then make timeout exclusive to read, write and signal.
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Finally, we add an extra check into ns_handle_pr_read_ready that
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asserts we truly have an idle timeout. It issues a warning now
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instead if this scenario occurs, rather than closing the
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connection.
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https://pagure.io/389-ds-base/issue/49171
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Author: wibrown
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Review by: mreynolds (thanks!)
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(cherry picked from commit c8ce1b32cc365174c8280111c2d55bba45f7949f)
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---
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ldap/servers/slapd/daemon.c | 15 +++++++++++----
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src/nunc-stans/ns/ns_event_fw_event.c | 28 ++++++++++++++++------------
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2 files changed, 27 insertions(+), 16 deletions(-)
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diff --git a/ldap/servers/slapd/daemon.c b/ldap/servers/slapd/daemon.c
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index a37c8c6..6b3331d 100644
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--- a/ldap/servers/slapd/daemon.c
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+++ b/ldap/servers/slapd/daemon.c
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@@ -1970,11 +1970,18 @@ ns_handle_pr_read_ready(struct ns_job_t *job)
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connection_release_nolock_ext(c, 1); /* release ref acquired when job was added */
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if (CONN_NEEDS_CLOSING(c)) {
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ns_handle_closure_nomutex(c);
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+ /* We shouldn't need the c_idletimeout check here because of how libevent works.
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+ * consider testing this and removing it oneday.
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+ */
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} else if (NS_JOB_IS_TIMER(ns_job_get_output_type(job))) {
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- /* idle timeout */
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- disconnect_server_nomutex_ext(c, c->c_connid, -1,
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- SLAPD_DISCONNECT_IDLE_TIMEOUT, EAGAIN,
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- 0 /* do not schedule closure, do it next */);
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+ if (c->c_idletimeout > 0) {
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+ /* idle timeout */
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+ disconnect_server_nomutex_ext(c, c->c_connid, -1,
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+ SLAPD_DISCONNECT_IDLE_TIMEOUT, EAGAIN,
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+ 0 /* do not schedule closure, do it next */);
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+ } else {
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+ slapi_log_err(SLAPI_LOG_WARNING, "ns_handle_pr_read_ready", "Received idletime out with c->c_idletimeout as 0. Ignoring.\n");
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+ }
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ns_handle_closure_nomutex(c);
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} else if ((connection_activity(c, maxthreads)) == -1) {
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/* This might happen as a result of
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diff --git a/src/nunc-stans/ns/ns_event_fw_event.c b/src/nunc-stans/ns/ns_event_fw_event.c
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index 58dac28..3acbaf7 100644
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--- a/src/nunc-stans/ns/ns_event_fw_event.c
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+++ b/src/nunc-stans/ns/ns_event_fw_event.c
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@@ -71,18 +71,22 @@ event_logger_cb(int severity, const char *msg)
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static ns_job_type_t
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event_flags_to_type(short events)
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{
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- ns_job_type_t job_type = 0;
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- if (events & EV_READ) {
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- job_type |= NS_JOB_READ;
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- }
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- if (events & EV_WRITE) {
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- job_type |= NS_JOB_WRITE;
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- }
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- if (events & EV_TIMEOUT) {
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- job_type |= NS_JOB_TIMER;
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- }
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- if (events & EV_SIGNAL) {
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- job_type |= NS_JOB_SIGNAL;
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+ /* The volatile here prevents gcc rearranging this code within the thread. */
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+ volatile ns_job_type_t job_type = 0;
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+
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+ /* Either we timeout *or* we are a real event */
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+ if (!(events & EV_TIMEOUT)) {
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+ if (events & EV_READ) {
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+ job_type |= NS_JOB_READ;
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+ }
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+ if (events & EV_WRITE) {
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+ job_type |= NS_JOB_WRITE;
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+ }
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+ if (events & EV_SIGNAL) {
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+ job_type |= NS_JOB_SIGNAL;
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+ }
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+ } else {
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+ job_type = NS_JOB_TIMER;
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}
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return job_type;
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}
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--
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2.9.3
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