examples/eventdev_pipeline: fix segfault on exit

  This commit fixes a segfault on exit by using Ctrl^C if the master lcore
was also being used as a worker core. The root cause of the issue was
that the interrupt handler was cleaning up resources such as the ethdev
and eventdev ports, and once the interrupt handler would return, that
thread would continue working as an eventdev worker, and dereference the
memory which just had free() called on it.

Fixed by moving the cleanup code from the interrupt handler to the
cleanup stage of main(), which the master thread will execute once
it has returned from its worker() functionality.

Fixes: 085edac2ca38 ("examples/eventdev_pipeline: support Tx adapter")

Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>

---

Cc: stable@dpdk.org
Cc: pbhagavatula@caviumnetworks.com
---
 examples/eventdev_pipeline/main.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)
  

Tested-by: Zhou, JunX W <junx.w.zhou@intel.com>

-----Original Message-----
From: Van Haaren, Harry 
Sent: Tuesday, May 5, 2020 5:39 PM
To: dev@dpdk.org
Cc: Zhou, JunX W <junx.w.zhou@intel.com>; Van Haaren, Harry <harry.van.haaren@intel.com>; stable@dpdk.org; pbhagavatula@caviumnetworks.com
Subject: [PATCH] examples/eventdev_pipeline: fix segfault on exit

This commit fixes a segfault on exit by using Ctrl^C if the master lcore was also being used as a worker core. The root cause of the issue was that the interrupt handler was cleaning up resources such as the ethdev and eventdev ports, and once the interrupt handler would return, that thread would continue working as an eventdev worker, and dereference the memory which just had free() called on it.

Fixed by moving the cleanup code from the interrupt handler to the cleanup stage of main(), which the master thread will execute once it has returned from its worker() functionality.

Fixes: 085edac2ca38 ("examples/eventdev_pipeline: support Tx adapter")

Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>

---

Cc: stable@dpdk.org
Cc: pbhagavatula@caviumnetworks.com
---
 examples/eventdev_pipeline/main.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/examples/eventdev_pipeline/main.c b/examples/eventdev_pipeline/main.c
index d0da51b1c..21958269f 100644
--- a/examples/eventdev_pipeline/main.c
+++ b/examples/eventdev_pipeline/main.c
@@ -301,12 +301,6 @@ signal_handler(int signum)
 
 		rte_eal_mp_wait_lcore();
 
-		RTE_ETH_FOREACH_DEV(portid) {
-			rte_eth_dev_close(portid);
-		}
-
-		rte_event_dev_stop(0);
-		rte_event_dev_close(0);
 	}
 	if (signum == SIGTSTP)
 		rte_event_dev_dump(0, stdout);
@@ -469,5 +463,14 @@ main(int argc, char **argv)
 
 	}
 
+	RTE_ETH_FOREACH_DEV(portid) {
+		rte_eth_dev_close(portid);
+	}
+
+	rte_event_dev_stop(0);
+	rte_event_dev_close(0);
+
+	rte_eal_cleanup();
+
 	return 0;
 }
--
2.17.1
  

07/05/2020 12:07, Zhou, JunX W:
> From: Van Haaren, Harry 
> > This commit fixes a segfault on exit by using Ctrl^C if the master lcore
> > was also being used as a worker core. The root cause of the issue was
> > that the interrupt handler was cleaning up resources such as the ethdev
> > and eventdev ports, and once the interrupt handler would return, that
> > thread would continue working as an eventdev worker, and dereference the
> > memory which just had free() called on it.
> > 
> > Fixed by moving the cleanup code from the interrupt handler to the cleanup
> > stage of main(), which the master thread will execute once it has
> > returned from its worker() functionality.
> > 
> > Fixes: 085edac2ca38 ("examples/eventdev_pipeline: support Tx adapter")
> > 
> > Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>
> Tested-by: Zhou, JunX W <junx.w.zhou@intel.com>

Applied, thanks