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Fix bug #76003: FPM /status reports wrong number of active processe

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The fix introduces early locking of scoreboard when it is updated
which prevents the race condition causing an incorrect number of
active processes being set.
This commit is contained in:
Jakub Zelenka
2022-04-09 13:20:07 +01:00
parent 07e91ca91c
commit 33bb201b3e
5 changed files with 66 additions and 20 deletions
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NEWS
+4
View File
@@ -6,6 +6,10 @@ PHP NEWS
. Fixed bug GH-8289 (Exceptions thrown within a yielded from iterator are
not rethrown into the generator). (Bob)
- FPM:
. Fixed bug #76003 (FPM /status reports wrong number of active processe).
(Jakub Zelenka)
- MySQLi:
. Fixed bug GH-8267 (MySQLi uses unsupported format specifier on Windows).
(cmb)
sapi/fpm/fpm/fpm_process_ctl.c
+19 -16
View File
@@ -324,21 +324,6 @@ static void fpm_pctl_perform_idle_server_maintenance(struct timeval *now) /* {{{
if (wp->config == NULL) continue;
for (child = wp->children; child; child = child->next) {
if (fpm_request_is_idle(child)) {
if (last_idle_child == NULL) {
last_idle_child = child;
} else {
if (timercmp(&child->started, &last_idle_child->started, <)) {
last_idle_child = child;
}
}
idle++;
} else {
active++;
}
}
/* update status structure for all PMs */
if (wp->listen_address_domain == FPM_AF_INET) {
if (0 > fpm_socket_get_listening_queue(wp->listening_socket, &cur_lq, NULL)) {
@@ -356,7 +341,25 @@ static void fpm_pctl_perform_idle_server_maintenance(struct timeval *now) /* {{{
#endif
}
}
fpm_scoreboard_update(idle, active, cur_lq, -1, -1, -1, 0, FPM_SCOREBOARD_ACTION_SET, wp->scoreboard);
fpm_scoreboard_update_begin(wp->scoreboard);
for (child = wp->children; child; child = child->next) {
if (fpm_request_is_idle(child)) {
if (last_idle_child == NULL) {
last_idle_child = child;
} else {
if (timercmp(&child->started, &last_idle_child->started, <)) {
last_idle_child = child;
}
}
idle++;
} else {
active++;
}
}
fpm_scoreboard_update_commit(idle, active, cur_lq, -1, -1, -1, 0, FPM_SCOREBOARD_ACTION_SET, wp->scoreboard);
/* this is specific to PM_STYLE_ONDEMAND */
if (wp->config->pm == PM_STYLE_ONDEMAND) {
sapi/fpm/fpm/fpm_request.c
+6 -2
View File
@@ -41,6 +41,8 @@ void fpm_request_accepting() /* {{{ */
fpm_clock_get(&now);
fpm_scoreboard_update_begin(NULL);
proc = fpm_scoreboard_proc_acquire(NULL, -1, 0);
if (proc == NULL) {
zlog(ZLOG_WARNING, "failed to acquire proc scoreboard");
@@ -52,7 +54,7 @@ void fpm_request_accepting() /* {{{ */
fpm_scoreboard_proc_release(proc);
/* idle++, active-- */
fpm_scoreboard_update(1, -1, 0, 0, 0, 0, 0, FPM_SCOREBOARD_ACTION_INC, NULL);
fpm_scoreboard_update_commit(1, -1, 0, 0, 0, 0, 0, FPM_SCOREBOARD_ACTION_INC, NULL);
}
/* }}} */
@@ -72,6 +74,8 @@ void fpm_request_reading_headers() /* {{{ */
times(&cpu);
#endif
fpm_scoreboard_update_begin(NULL);
proc = fpm_scoreboard_proc_acquire(NULL, -1, 0);
if (proc == NULL) {
zlog(ZLOG_WARNING, "failed to acquire proc scoreboard");
@@ -95,7 +99,7 @@ void fpm_request_reading_headers() /* {{{ */
fpm_scoreboard_proc_release(proc);
/* idle--, active++, request++ */
fpm_scoreboard_update(-1, 1, 0, 0, 1, 0, 0, FPM_SCOREBOARD_ACTION_INC, NULL);
fpm_scoreboard_update_commit(-1, 1, 0, 0, 1, 0, 0, FPM_SCOREBOARD_ACTION_INC, NULL);
}
/* }}} */
sapi/fpm/fpm/fpm_scoreboard.c
+34 -2
View File
@@ -74,18 +74,39 @@ int fpm_scoreboard_init_main() /* {{{ */
}
/* }}} */
void fpm_scoreboard_update(int idle, int active, int lq, int lq_len, int requests, int max_children_reached, int slow_rq, int action, struct fpm_scoreboard_s *scoreboard) /* {{{ */
static struct fpm_scoreboard_s *fpm_scoreboard_get_for_update(struct fpm_scoreboard_s *scoreboard) /* {{{ */
{
if (!scoreboard) {
scoreboard = fpm_scoreboard;
}
if (!scoreboard) {
zlog(ZLOG_WARNING, "Unable to update scoreboard: the SHM has not been found");
}
return scoreboard;
}
/* }}} */
void fpm_scoreboard_update_begin(struct fpm_scoreboard_s *scoreboard) /* {{{ */
{
scoreboard = fpm_scoreboard_get_for_update(scoreboard);
if (!scoreboard) {
return;
}
fpm_spinlock(&scoreboard->lock, 0);
}
/* }}} */
void fpm_scoreboard_update_commit(
int idle, int active, int lq, int lq_len, int requests, int max_children_reached,
int slow_rq, int action, struct fpm_scoreboard_s *scoreboard) /* {{{ */
{
scoreboard = fpm_scoreboard_get_for_update(scoreboard);
if (!scoreboard) {
return;
}
if (action == FPM_SCOREBOARD_ACTION_SET) {
if (idle >= 0) {
scoreboard->idle = idle;
@@ -154,6 +175,17 @@ void fpm_scoreboard_update(int idle, int active, int lq, int lq_len, int request
}
/* }}} */
void fpm_scoreboard_update(
int idle, int active, int lq, int lq_len, int requests, int max_children_reached,
int slow_rq, int action, struct fpm_scoreboard_s *scoreboard) /* {{{ */
{
fpm_scoreboard_update_begin(scoreboard);
fpm_scoreboard_update_commit(
idle, active, lq, lq_len, requests, max_children_reached, slow_rq, action, scoreboard);
}
/* }}} */
struct fpm_scoreboard_s *fpm_scoreboard_get() /* {{{*/
{
return fpm_scoreboard;
sapi/fpm/fpm/fpm_scoreboard.h
+3
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@@ -73,7 +73,10 @@ struct fpm_scoreboard_s {
int fpm_scoreboard_init_main();
int fpm_scoreboard_init_child(struct fpm_worker_pool_s *wp);
void fpm_scoreboard_update_begin(struct fpm_scoreboard_s *scoreboard);
void fpm_scoreboard_update_commit(int idle, int active, int lq, int lq_len, int requests, int max_children_reached, int slow_rq, int action, struct fpm_scoreboard_s *scoreboard);
void fpm_scoreboard_update(int idle, int active, int lq, int lq_len, int requests, int max_children_reached, int slow_rq, int action, struct fpm_scoreboard_s *scoreboard);
struct fpm_scoreboard_s *fpm_scoreboard_get();
struct fpm_scoreboard_proc_s *fpm_scoreboard_proc_get(struct fpm_scoreboard_s *scoreboard, int child_index);
struct fpm_scoreboard_proc_s *fpm_scoreboard_proc_get_from_child(struct fpm_child_s *child);