[PATCH] eal: fix segment fault when exit trace

[Chengwen Feng <fengchengwen@huawei.com>]

Bug scenario:
1. start testpmd:
	dpdk-testpmd -l 4-6 -a 0000:7d:00.0 --trace=.* -- -i
2. quit testpmd and then observed segment fault:
	Bye...
	Segmentation fault (core dumped)

The root cause is that rte_trace_save() and eal_trace_fini() access
the huge pages which were cleanup by rte_eal_memory_detach().

This patch moves rte_trace_save() and eal_trace_fini() before
rte_eal_memory_detach() to fix the bug.

Fixes: dfbc61a2f9a6 ("mem: detach memsegs on cleanup")
Cc: stable@dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 lib/eal/linux/eal.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/eal/linux/eal.c b/lib/eal/linux/eal.c
index 1ef263434a..c6f2056197 100644
--- a/lib/eal/linux/eal.c
+++ b/lib/eal/linux/eal.c
@@ -1266,13 +1266,13 @@ rte_eal_cleanup(void)
 	vfio_mp_sync_cleanup();
 #endif
 	rte_mp_channel_cleanup();
+	rte_trace_save();
+	eal_trace_fini();
 	/* after this point, any DPDK pointers will become dangling */
 	rte_eal_memory_detach();
 	eal_mp_dev_hotplug_cleanup();
 	rte_eal_malloc_heap_cleanup();
 	rte_eal_alarm_cleanup();
-	rte_trace_save();
-	eal_trace_fini();
 	eal_cleanup_config(internal_conf);
 	rte_eal_log_cleanup();
 	return 0;
-- 
2.33.0