linux-kernel - [PATCH 09/19] staging/lustre/osc: LBUG in osc_lru

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Date:	Mon, 14 Sep 2015 18:41:25 -0400
From:	green@...uxhacker.ru
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	Andreas Dilger <andreas.dilger@...el.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Hiroya Nozaki <nozaki.hiroya@...fujitsu.com>,
	Oleg Drokin <oleg.drokin@...el.com>
Subject: [PATCH 09/19] staging/lustre/osc: LBUG in osc_lru_reclaim

From: Hiroya Nozaki <nozaki.hiroya@...fujitsu.com>

LASSERT touches cl_client_cache->ccc_lru without any protection.
So this patch the LASSERT moves to the section protected by
cl_client_cache->ccc_lru_lock

Signed-off-by: Hiroya Nozaki <nozaki.hiroya@...fujitsu.com>
Reviewed-on: http://review.whamcloud.com/14901
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6624
Reviewed-by: Andreas Dilger <andreas.dilger@...el.com>
Reviewed-by: James Simmons <uja.ornl@...oo.com>
Signed-off-by: Oleg Drokin <oleg.drokin@...el.com>
---
 drivers/staging/lustre/lustre/osc/osc_page.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/lustre/lustre/osc/osc_page.c b/drivers/staging/lustre/lustre/osc/osc_page.c
index 856d859..2af3232 100644
--- a/drivers/staging/lustre/lustre/osc/osc_page.c
+++ b/drivers/staging/lustre/lustre/osc/osc_page.c
@@ -818,7 +818,6 @@ static int osc_lru_reclaim(struct client_obd *cli)
 	int rc;
 
 	LASSERT(cache != NULL);
-	LASSERT(!list_empty(&cache->ccc_lru));
 
 	rc = osc_lru_shrink(cli, lru_shrink_min);
 	if (rc != 0) {
@@ -835,6 +834,8 @@ static int osc_lru_reclaim(struct client_obd *cli)
 	/* Reclaim LRU slots from other client_obd as it can't free enough
 	 * from its own. This should rarely happen. */
 	spin_lock(&cache->ccc_lru_lock);
+	LASSERT(!list_empty(&cache->ccc_lru));
+
 	cache->ccc_lru_shrinkers++;
 	list_move_tail(&cli->cl_lru_osc, &cache->ccc_lru);
 
-- 
2.1.0

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