From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch fixes a BUG() in iscsit_close_session() that could be
triggered when iscsit_logout_post_handler() execution from within
tx thread context was not run for more than SECONDS_FOR_LOGOUT_COMP
(15 seconds), and the TCP connection didn't already close before
then forcing tx thread context to automatically exit.
This would manifest itself during explicit logout as:
[33206.974254] 1 connection(s) still exist for iSCSI session to iqn.1993-08.org.debian:01:3f5523242179
[33206.980184] INFO: NMI handler (kgdb_nmi_handler) took too long to run: 2100.772 msecs
[33209.078643] ------------[ cut here ]------------
[33209.078646] kernel BUG at drivers/target/iscsi/iscsi_target.c:4346!
Normally when explicit logout attempt fails, the tx thread context
exits and iscsit_close_connection() from rx thread context does the
extra cleanup once it detects conn->conn_logout_remove has not been
cleared by the logout type specific post handlers.
To address this special case, if the logout post handler in tx thread
context detects conn->tx_thread_active has already been cleared, simply
return and exit in order for existing iscsit_close_connection()
logic from rx thread context do failed logout cleanup.
Reported-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Cc: Mike Christie <mchristi@xxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Sagi Grimberg <sagig@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 3.14+
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/target/iscsi/iscsi_target.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 0d8f815..c025451 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -4423,8 +4423,11 @@ static void iscsit_logout_post_handler_closesession(
* always sleep waiting for RX/TX thread shutdown to complete
* within iscsit_close_connection().
*/
- if (!conn->conn_transport->rdma_shutdown)
+ if (!conn->conn_transport->rdma_shutdown) {
sleep = cmpxchg(&conn->tx_thread_active, true, false);
+ if (!sleep)
+ return;
+ }
atomic_set(&conn->conn_logout_remove, 0);
complete(&conn->conn_logout_comp);
@@ -4440,8 +4443,11 @@ static void iscsit_logout_post_handler_samecid(
{
int sleep = 1;
- if (!conn->conn_transport->rdma_shutdown)
+ if (!conn->conn_transport->rdma_shutdown) {
sleep = cmpxchg(&conn->tx_thread_active, true, false);
+ if (!sleep)
+ return;
+ }
atomic_set(&conn->conn_logout_remove, 0);
complete(&conn->conn_logout_comp);
--
1.9.1
