It looks like in the error paths the attr variable is not destroyed.
Please consider adding this patch to the source base.

Regards,

B.


# HG changeset patch
# User bartw@xs4all.nl
# Date 1444770783 -7200
# Tue Oct 13 23:13:03 2015 +0200
# Branch thread_unrelease_attr
# Node ID c2ae7364ec3f2251b8d734f3be7b62ea413dc36f
# Parent 2f34ea503ac4e015cc08f6efbb279b360eda609c
Release attr variable on exit

diff -r 2f34ea503ac4 -r c2ae7364ec3f src/core/ngx_thread_pool.c
--- a/src/core/ngx_thread_pool.c Wed Oct 07 22:19:42 2015 +0300
+++ b/src/core/ngx_thread_pool.c Tue Oct 13 23:13:03 2015 +0200
@@ -140,6 +140,7 @@
#if 0
err = pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN);
if (err) {
+ (void) pthread_attr_destroy(&attr);
ngx_log_error(NGX_LOG_ALERT, log, err,
"pthread_attr_setstacksize() failed");
return NGX_ERROR;
@@ -149,6 +150,7 @@
for (n = 0; n < tp->threads; n++) {
err = pthread_create(&tid, &attr, ngx_thread_pool_cycle, tp);
if (err) {
+ (void) pthread_attr_destroy(&attr);
ngx_log_error(NGX_LOG_ALERT, log, err,
"pthread_create() failed");
return NGX_ERROR;
diff -r 2f34ea503ac4 -r c2ae7364ec3f src/os/unix/ngx_thread_mutex.c
--- a/src/os/unix/ngx_thread_mutex.c Wed Oct 07 22:19:42 2015
+0300
+++ b/src/os/unix/ngx_thread_mutex.c Tue Oct 13 23:13:03 2015
+0200
@@ -89,6 +89,7 @@

err = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
if (err != 0) {
+ (void) pthread_attr_destroy(&attr);
ngx_log_error(NGX_LOG_EMERG, log, err,
"pthread_mutexattr_settype"
"(PTHREAD_MUTEX_ERRORCHECK) failed");
@@ -97,6 +98,7 @@

err = pthread_mutex_init(mtx, &attr);
if (err != 0) {
+ (void) pthread_attr_destroy(&attr);
ngx_log_error(NGX_LOG_EMERG, log, err,
"pthread_mutex_init() failed");
return NGX_ERROR;

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