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0c594c8)
The race is result of use-after-free situation:
~ ptlrpc_stop_pinger() ~ ptlrpc_pinger_main()
---------------------------------------------------------------
thread_set_flags(SVC_STOPPING)
cfs_waitq_signal(pinger_thread) ...
... thread_set_flags(SVC_STOPPED)
l_wait_event(thread_is_stopped)
OBD_FREE_PTR(pinger_thread)
... cfs_waitq_signal(pinger_thread)
---------------------------------------------------------------
The memory used by pinger_thread might have been freed and
reallocated to something else, when ptlrpc_pinger_main()
used it in cvs_waitq_signal().
Signed-off-by: Li Wei <wei.g.li@intel.com>
Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Change-Id: I3516c7ece2b2e1e4e0b2e47acb0583c174a3e631
Reviewed-on: http://review.whamcloud.com/6040
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Faccini Bruno <bruno.faccini@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
-static struct ptlrpc_thread *pinger_thread = NULL;
+static struct ptlrpc_thread pinger_thread;
int ptlrpc_start_pinger(void)
{
int ptlrpc_start_pinger(void)
{
- struct l_wait_info lwi = { 0 };
- int rc;
+ struct l_wait_info lwi = { 0 };
+ int rc;
- if (pinger_thread != NULL)
- RETURN(-EALREADY);
+ if (!thread_is_init(&pinger_thread) &&
+ !thread_is_stopped(&pinger_thread))
+ RETURN(-EALREADY);
- OBD_ALLOC_PTR(pinger_thread);
- if (pinger_thread == NULL)
- RETURN(-ENOMEM);
- cfs_waitq_init(&pinger_thread->t_ctl_waitq);
- cfs_waitq_init(&suspend_timeouts_waitq);
+ cfs_waitq_init(&pinger_thread.t_ctl_waitq);
+ cfs_waitq_init(&suspend_timeouts_waitq);
- strcpy(pinger_thread->t_name, "ll_ping");
+ strcpy(pinger_thread.t_name, "ll_ping");
/* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
* just drop the VM and FILES in cfs_daemonize_ctxt() right away. */
/* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
* just drop the VM and FILES in cfs_daemonize_ctxt() right away. */
- rc = cfs_create_thread(ptlrpc_pinger_main,
- pinger_thread, CFS_DAEMON_FLAGS);
- if (rc < 0) {
- CERROR("cannot start thread: %d\n", rc);
- OBD_FREE(pinger_thread, sizeof(*pinger_thread));
- pinger_thread = NULL;
- RETURN(rc);
- }
- l_wait_event(pinger_thread->t_ctl_waitq,
- thread_is_running(pinger_thread), &lwi);
+ rc = cfs_create_thread(ptlrpc_pinger_main,
+ &pinger_thread, CFS_DAEMON_FLAGS);
+ if (rc < 0) {
+ CERROR("cannot start thread: %d\n", rc);
+ RETURN(rc);
+ }
+ l_wait_event(pinger_thread.t_ctl_waitq,
+ thread_is_running(&pinger_thread), &lwi);
if (suppress_pings)
CWARN("Pings will be suppressed at the request of the "
if (suppress_pings)
CWARN("Pings will be suppressed at the request of the "
int ptlrpc_stop_pinger(void)
{
int ptlrpc_stop_pinger(void)
{
- struct l_wait_info lwi = { 0 };
- int rc = 0;
+ struct l_wait_info lwi = { 0 };
- if (pinger_thread == NULL)
- RETURN(-EALREADY);
+ if (thread_is_init(&pinger_thread) ||
+ thread_is_stopped(&pinger_thread))
+ RETURN(-EALREADY);
- ptlrpc_pinger_remove_timeouts();
- mutex_lock(&pinger_mutex);
- thread_set_flags(pinger_thread, SVC_STOPPING);
- cfs_waitq_signal(&pinger_thread->t_ctl_waitq);
- mutex_unlock(&pinger_mutex);
+ ptlrpc_pinger_remove_timeouts();
- l_wait_event(pinger_thread->t_ctl_waitq,
- thread_is_stopped(pinger_thread), &lwi);
+ thread_set_flags(&pinger_thread, SVC_STOPPING);
+ cfs_waitq_signal(&pinger_thread.t_ctl_waitq);
- OBD_FREE_PTR(pinger_thread);
- pinger_thread = NULL;
- RETURN(rc);
+ l_wait_event(pinger_thread.t_ctl_waitq,
+ thread_is_stopped(&pinger_thread), &lwi);
+ RETURN(0);
}
void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
}
void ptlrpc_pinger_sending_on_import(struct obd_import *imp)
void ptlrpc_pinger_wake_up()
{
#ifdef ENABLE_PINGER
void ptlrpc_pinger_wake_up()
{
#ifdef ENABLE_PINGER
- thread_add_flags(pinger_thread, SVC_EVENT);
- cfs_waitq_signal(&pinger_thread->t_ctl_waitq);
+ thread_add_flags(&pinger_thread, SVC_EVENT);
+ cfs_waitq_signal(&pinger_thread.t_ctl_waitq);