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Subject[PATCH 3.16 094/346] target: Fix race between iscsi-target connection shutdown + ABORT_TASK
3.16.39-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Nicholas Bellinger <nab@linux-iscsi.org>

commit 064cdd2d91c2805d788876082f31cc63506f22c3 upstream.

This patch fixes a race in iscsit_release_commands_from_conn() ->
iscsit_free_cmd() -> transport_generic_free_cmd() + wait_for_tasks=1,
where CMD_T_FABRIC_STOP could end up being set after the final
kref_put() is called from core_tmr_abort_task() context.

This results in transport_generic_free_cmd() blocking indefinately
on se_cmd->cmd_wait_comp, because the target_release_cmd_kref()
check for CMD_T_FABRIC_STOP returns false.

To address this bug, make iscsit_release_commands_from_conn()
do list_splice and set CMD_T_FABRIC_STOP early while holding
iscsi_conn->cmd_lock. Also make iscsit_aborted_task() only
remove iscsi_cmd_t if CMD_T_FABRIC_STOP has not already been
set.

Finally in target_release_cmd_kref(), only honor fabric_stop
if CMD_T_ABORTED has been set.

Cc: Mike Christie <mchristi@redhat.com>
Cc: Quinn Tran <quinn.tran@qlogic.com>
Cc: Himanshu Madhani <himanshu.madhani@qlogic.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Tested-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/target/iscsi/iscsi_target.c | 22 ++++++++++++++++------
drivers/target/target_core_transport.c | 3 ++-
2 files changed, 18 insertions(+), 7 deletions(-)

--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -505,7 +505,8 @@ static void iscsit_aborted_task(struct i
bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);

spin_lock_bh(&conn->cmd_lock);
- if (!list_empty(&cmd->i_conn_node))
+ if (!list_empty(&cmd->i_conn_node) &&
+ !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
list_del_init(&cmd->i_conn_node);
spin_unlock_bh(&conn->cmd_lock);

@@ -4174,6 +4175,7 @@ transport_err:

static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
{
+ LIST_HEAD(tmp_list);
struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
struct iscsi_session *sess = conn->sess;
/*
@@ -4182,18 +4184,26 @@ static void iscsit_release_commands_from
* has been reset -> returned sleeping pre-handler state.
*/
spin_lock_bh(&conn->cmd_lock);
- list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
+ list_splice_init(&conn->conn_cmd_list, &tmp_list);

+ list_for_each_entry(cmd, &tmp_list, i_conn_node) {
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+
+ if (se_cmd->se_tfo != NULL) {
+ spin_lock(&se_cmd->t_state_lock);
+ se_cmd->transport_state |= CMD_T_FABRIC_STOP;
+ spin_unlock(&se_cmd->t_state_lock);
+ }
+ }
+ spin_unlock_bh(&conn->cmd_lock);
+
+ list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
list_del_init(&cmd->i_conn_node);
- spin_unlock_bh(&conn->cmd_lock);

iscsit_increment_maxcmdsn(cmd, sess);
-
iscsit_free_cmd(cmd, true);

- spin_lock_bh(&conn->cmd_lock);
}
- spin_unlock_bh(&conn->cmd_lock);
}

static void iscsit_stop_timers_for_cmds(
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2457,7 +2457,8 @@ static void target_release_cmd_kref(stru


spin_lock(&se_cmd->t_state_lock);
- fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP);
+ fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP) &&
+ (se_cmd->transport_state & CMD_T_ABORTED);
spin_unlock(&se_cmd->t_state_lock);

if (se_cmd->cmd_wait_set || fabric_stop) {
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