The kauditd_thread wait loop is a bit iffy; it has a number of problems:
- calls try_to_freeze() before schedule(); you typically want the
thread to re-evaluate the sleep condition when unfreezing, also
freeze_task() issues a wakeup.
- it unconditionally does the {add,remove}_wait_queue(), even when the
sleep condition is false.
Use wait_event_freezable() that does the right thing.
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Eric Paris <[email protected]>
Reported-by: Mike Galbraith <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link:
http://lkml.kernel.org/r/[email protected]
---
kernel/audit.c | 11 +----------
1 file changed, 1 insertion(+), 10 deletions(-)
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -499,7 +499,6 @@ static int kauditd_thread(void *dummy)
set_freezable();
while (!kthread_should_stop()) {
struct sk_buff *skb;
- DECLARE_WAITQUEUE(wait, current);
flush_hold_queue();
@@ -514,16 +513,8 @@ static int kauditd_thread(void *dummy)
audit_printk_skb(skb);
continue;
}
- set_current_state(TASK_INTERRUPTIBLE);
- add_wait_queue(&kauditd_wait, &wait);
- if (!skb_queue_len(&audit_skb_queue)) {
- try_to_freeze();
- schedule();
- }
-
- __set_current_state(TASK_RUNNING);
- remove_wait_queue(&kauditd_wait, &wait);
+ wait_event_freezable(kauditd_wait,
skb_queue_len(&audit_skb_queue));
}
return 0;
}
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