sleep_wq can be NULL on finish_wait

yanko-yankulov · yanko-yankulov · commit 069238446fe8 · 2017-02-21T15:02:40.000+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
@@ -524,7 +524,7 @@ 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
`@@ -524,7 +524,7 @@ finish_wait(wait_queue_head_t q, wait_queue_t wait)`
`524`	`524`	`{`
`525`	`525`	`int flags;`
`526`	`526`	`MPASS(current != NULL);`
`527`		`- MPASS(current->sleep_wq == q);`
	`527`	`+ MPASS(current->sleep_wq == q \|\| current->sleep_wq == NULL);`
`528`	`528`
`529`	`529`	`current->sleep_wq = NULL;`
`530`	`530`	`__set_current_state(TASK_RUNNING);`