sleep_wq can be NULL on finish_wait

yanko-yankulov · yanko-yankulov · commit 3bcceb6e6ad1 · 2017-02-19T18:28:42.000+02:00
If we have pending signals, when entering prepare_to_wait_event, we will not set currebt-&gt;sleep_wq, so it will stay NULL
diff --git a/sys/compat/linuxkpi/common/include/linux/wait.h b/sys/compat/linuxkpi/common/include/linux/wait.h
@@ -550,7 +550,7 @@ finish_wait(wait_queue_head_t *q, wait_queue_t *wait)
 {
 	int flags;
 	MPASS(current != NULL);
-	MPASS(current->sleep_wq == q);
+	MPASS(current->sleep_wq == q || current->sleep_wq == NULL);
 
 	current->sleep_wq = NULL;
 	__set_current_state(TASK_RUNNING);

Original file line number	Diff line number	Diff line change
`@@ -550,7 +550,7 @@ finish_wait(wait_queue_head_t q, wait_queue_t wait)`
`550`	`550`	`{`
`551`	`551`	`int flags;`
`552`	`552`	`MPASS(current != NULL);`
`553`		`- MPASS(current->sleep_wq == q);`
	`553`	`+ MPASS(current->sleep_wq == q \|\| current->sleep_wq == NULL);`
`554`	`554`
`555`	`555`	`current->sleep_wq = NULL;`
`556`	`556`	`__set_current_state(TASK_RUNNING);`