[PATCH v2] lib/eal: fix segfaults due to thread exit order

[zhichaox . zeng]

From: Zhichao Zeng <zhichaox.z...@intel.com>

The eal-intr-thread is not closed before memory cleanup in the
process of exiting. There is a small probability that when the
eal-intr-thread is about to use some pointers, the memory were
just cleaned, which cause the segment fault error caught by ASan.

This patch close the eal-intr-thread before memory cleanup when
exiting to avoid segment fault.

Signed-off-by: Zhichao Zeng <zhichaox.z...@intel.com>

---
v2: add the same API for FreeBSD
---
 lib/eal/common/eal_private.h     |  7 +++++++
 lib/eal/freebsd/eal.c            |  1 +
 lib/eal/freebsd/eal_interrupts.c | 12 ++++++++++++
 lib/eal/linux/eal.c              |  1 +
 lib/eal/linux/eal_interrupts.c   | 12 ++++++++++++
 5 files changed, 33 insertions(+)

diff --git a/lib/eal/common/eal_private.h b/lib/eal/common/eal_private.h
index 44d14241f0..7adf41b7d7 100644
--- a/lib/eal/common/eal_private.h
+++ b/lib/eal/common/eal_private.h
@@ -152,6 +152,13 @@ int rte_eal_tailqs_init(void);
  */
 int rte_eal_intr_init(void);
 
+/**
+ * Destroy interrupt handling thread.
+ *
+ * This function is private to EAL.
+ */
+void rte_eal_intr_destroy(void);
+
 /**
  * Close the default log stream
  *
diff --git a/lib/eal/freebsd/eal.c b/lib/eal/freebsd/eal.c
index a6b20960f2..0a6bd0efa3 100644
--- a/lib/eal/freebsd/eal.c
+++ b/lib/eal/freebsd/eal.c
@@ -893,6 +893,7 @@ rte_eal_cleanup(void)
                eal_get_internal_configuration();
        rte_service_finalize();
        rte_mp_channel_cleanup();
+       rte_eal_intr_destroy();
        /* after this point, any DPDK pointers will become dangling */
        rte_eal_memory_detach();
        rte_eal_alarm_cleanup();
diff --git a/lib/eal/freebsd/eal_interrupts.c b/lib/eal/freebsd/eal_interrupts.c
index 9f720bdc8f..cac3859b06 100644
--- a/lib/eal/freebsd/eal_interrupts.c
+++ b/lib/eal/freebsd/eal_interrupts.c
@@ -648,6 +648,18 @@ rte_eal_intr_init(void)
        return ret;
 }
 
+void
+rte_eal_intr_destroy(void)
+{
+       /* cancel the host thread to wait/handle the interrupt */
+       pthread_cancel(intr_thread);
+       pthread_join(intr_thread, NULL);
+
+       /* close kqueue */
+       close(kq);
+       kq = -1;
+}
+
 int
 rte_intr_rx_ctl(struct rte_intr_handle *intr_handle,
                int epfd, int op, unsigned int vec, void *data)
diff --git a/lib/eal/linux/eal.c b/lib/eal/linux/eal.c
index 1ef263434a..b310681acf 100644
--- a/lib/eal/linux/eal.c
+++ b/lib/eal/linux/eal.c
@@ -1266,6 +1266,7 @@ rte_eal_cleanup(void)
        vfio_mp_sync_cleanup();
 #endif
        rte_mp_channel_cleanup();
+       rte_eal_intr_destroy();
        /* after this point, any DPDK pointers will become dangling */
        rte_eal_memory_detach();
        eal_mp_dev_hotplug_cleanup();
diff --git a/lib/eal/linux/eal_interrupts.c b/lib/eal/linux/eal_interrupts.c
index d52ec8eb4c..7e9853e8e7 100644
--- a/lib/eal/linux/eal_interrupts.c
+++ b/lib/eal/linux/eal_interrupts.c
@@ -1199,6 +1199,18 @@ rte_eal_intr_init(void)
        return ret;
 }
 
+void
+rte_eal_intr_destroy(void)
+{
+       /* cancel the host thread to wait/handle the interrupt */
+       pthread_cancel(intr_thread);
+       pthread_join(intr_thread, NULL);
+
+       /* close the pipe used by epoll */
+       close(intr_pipe.writefd);
+       close(intr_pipe.readfd);
+}
+
 static void
 eal_intr_proc_rxtx_intr(int fd, const struct rte_intr_handle *intr_handle)
 {
-- 
2.25.1