[lustre-devel] [PATCH 05/41] lustre: ptlrpc: do not output error when imp_sec is freed

[James Simmons]

From: Sebastien Buisson <sbuisson at ddn.com>

There is a race condition on client reconnect when the import is being
destroyed.  Some outstanding client bound requests are being processed
when the imp_sec has already been freed.
Ensure to output the error message in import_sec_validate_get() only
if import is not already in the zombie work queue.

Fixes: 1a6cc3b1a9 ("staging: lustre: obdclass: use workqueue for zombie management")
WC-bug-id: https://jira.whamcloud.com/browse/LU-14355
Lustre-commit: 20cbbb084b671a1 ("LU-14355 ptlrpc: do not output error when imp_sec is freed")
Signed-off-by: Sebastien Buisson <sbuisson at ddn.com>
Reviewed-on: https://review.whamcloud.com/41310
Reviewed-by: Andreas Dilger <adilger at whamcloud.com>
Reviewed-by: John L. Hammond <jhammond at whamcloud.com>
Reviewed-by: Oleg Drokin <green at whamcloud.com>
Signed-off-by: James Simmons <jsimmons at infradead.org>
---
 fs/lustre/ptlrpc/sec.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/lustre/ptlrpc/sec.c b/fs/lustre/ptlrpc/sec.c
index 43d4f76..5b5faac 100644
--- a/fs/lustre/ptlrpc/sec.c
+++ b/fs/lustre/ptlrpc/sec.c
@@ -345,8 +345,11 @@ static int import_sec_validate_get(struct obd_import *imp,
 
 	*sec = sptlrpc_import_sec_ref(imp);
 	if (!*sec) {
-		CERROR("import %p (%s) with no sec\n",
-		       imp, ptlrpc_import_state_name(imp->imp_state));
+		/* Only output an error when the import is still active */
+		if (!test_bit(WORK_STRUCT_PENDING_BIT,
+			      work_data_bits(&imp->imp_zombie_work)))
+			CERROR("import %p (%s) with no sec\n",
+			       imp, ptlrpc_import_state_name(imp->imp_state));
 		return -EACCES;
 	}
 
-- 
1.8.3.1