iscsi-target: fix iscsit_del_np deadlock on unload

On uniprocessor preemptible kernel, target core deadlocks on unload. The
following events happen:
* iscsit_del_np is called
* it calls send_sig(SIGINT, np->np_thread, 1);
* the scheduler switches to the np_thread
* the np_thread is woken up, it sees that kthread_should_stop() returns
  false, so it doesn't terminate
* the np_thread clears signals with flush_signals(current); and goes back
  to sleep in iscsit_accept_np
* the scheduler switches back to iscsit_del_np
* iscsit_del_np calls kthread_stop(np->np_thread);
* the np_thread is waiting in iscsit_accept_np and it doesn't respond to
  kthread_stop

The deadlock could be resolved if the administrator sends SIGINT signal to
the np_thread with killall -INT iscsi_np

The reproducible deadlock was introduced in commit
db6077fd0b7dd41dc6ff18329cec979379071f87, but the thread-stopping code was
racy even before.

This patch fixes the problem. Using kthread_should_stop to stop the
np_thread is unreliable, so we test np_thread_state instead. If
np_thread_state equals ISCSI_NP_THREAD_SHUTDOWN, the thread exits.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index fecb695..5e71ac6 100644 (file)
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -1216,7 +1216,7 @@ old_sess_out:
 static int __iscsi_target_login_thread(struct iscsi_np *np)
 {
        u8 *buffer, zero_tsih = 0;
-       int ret = 0, rc, stop;
+       int ret = 0, rc;
        struct iscsi_conn *conn = NULL;
        struct iscsi_login *login;
        struct iscsi_portal_group *tpg = NULL;
@@ -1230,6 +1230,9 @@ static int __iscsi_target_login_thread(struct iscsi_np *np)
        if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
                np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
                complete(&np->np_restart_comp);
+       } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
+               spin_unlock_bh(&np->np_thread_lock);
+               goto exit;
        } else {
                np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
        }
@@ -1422,10 +1425,8 @@ old_sess_out:
        }
 
 out:
-       stop = kthread_should_stop();
-       /* Wait for another socket.. */
-       if (!stop)
-               return 1;
+       return 1;
+
 exit:
        iscsi_stop_login_thread_timer(np);
        spin_lock_bh(&np->np_thread_lock);
@@ -1442,7 +1443,7 @@ int iscsi_target_login_thread(void *arg)
 
        allow_signal(SIGINT);
 
-       while (!kthread_should_stop()) {
+       while (1) {
                ret = __iscsi_target_login_thread(np);
                /*
                 * We break and exit here unless another sock_accept() call