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From: Harry van Haaren <harry.van.haaren@intel.com>
To: dev@dpdk.org
Cc: pbhagavatula@caviumnetworks.com,
	Harry van Haaren <harry.van.haaren@intel.com>,
	thomas@monjalon.net
Subject: [dpdk-dev] [PATCH] test: fix debug autotest with eal cleanup addition
Date: Tue, 30 Jan 2018 18:21:37 +0000	[thread overview]
Message-ID: <1517336497-17943-1-git-send-email-harry.van.haaren@intel.com> (raw)

Before this patch, the debug_autotest would call fork(),
call rte_panic() or rte_exit() in the child process, and
examine the return code to verify that rte_panic() and
rte_exit() were correctly reporting failures.

With the inclusion of the rte_eal_cleanup() patch, rte_exit()
was modified to cleanly tear-down EAL allocations. Currently
only one library (service cores) is allocared by EAL at startup
and should be cleaned up. This library has a check on a normal
(non-hugepage) variable to protect against double cleanup. The
service cores finalize() function itself frees back hugepage mem.

Given the fork() approach from the unit test, and the fact that
the double-free check is on an ordinary variable, causes multiple
child processed (fork()-ed from the unit-test runner) to attempt
to free the huge-page memory multiple times. The variable to
protect against double-cleanup was not effective, as the fork()
would restore it to show initialized in the next child.

The solution is to call rte_service_finalize() *before* calling
fork(), which results in the service cores double-cleanup variable
to be zero before the fork(), and hence the child processes never
free the hugepage service-cores memory (correct behaviour, as the
unit-test suite is still running, and owns the hugepages).

Fixes: aec9c13c5257 ("eal: add function to release internal resources")

Reported-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>

---

Cc: thomas@monjalon.net

Please consider for including in RC2 as this fixes the
currently failing debug_autotest.
---
 test/test/test_debug.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/test/test/test_debug.c b/test/test/test_debug.c
index dd0de44..faf2cf5 100644
--- a/test/test/test_debug.c
+++ b/test/test/test_debug.c
@@ -10,6 +10,7 @@
 #include <rte_debug.h>
 #include <rte_common.h>
 #include <rte_eal.h>
+#include <rte_service_component.h>
 
 #include "test.h"
 
@@ -50,6 +51,11 @@ test_exit_val(int exit_val)
 	int pid;
 	int status;
 
+	/* manually cleanup EAL memory, as the fork() below would otherwise
+	 * cause the same hugepages to be free()-ed multiple times.
+	 */
+	rte_service_finalize();
+
 	pid = fork();
 
 	if (pid == 0)
-- 
2.7.4

             reply	other threads:[~2018-01-30 18:21 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-30 18:21 Harry van Haaren [this message]
2018-01-30 18:26 ` [dpdk-dev] [PATCH v2] " Harry van Haaren
2018-01-30 23:53   ` Thomas Monjalon
2018-01-31 13:53   ` Ananyev, Konstantin
2018-01-31 14:31     ` Thomas Monjalon
2018-01-31 14:54       ` Van Haaren, Harry

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