This is a note to let you know that I've just added the patch titled
audit: wait_for_auditd() should use TASK_UNINTERRUPTIBLE
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
audit-wait_for_auditd-should-use-task_uninterruptible.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f000cfdde5de4fc15dead5ccf524359c07eadf2b Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Date: Wed, 12 Jun 2013 14:04:46 -0700
Subject: audit: wait_for_auditd() should use TASK_UNINTERRUPTIBLE
From: Oleg Nesterov <oleg@xxxxxxxxxx>
commit f000cfdde5de4fc15dead5ccf524359c07eadf2b upstream.
audit_log_start() does wait_for_auditd() in a loop until
audit_backlog_wait_time passes or audit_skb_queue has a room.
If signal_pending() is true this becomes a busy-wait loop, schedule() in
TASK_INTERRUPTIBLE won't block.
Thanks to Guy for fully investigating and explaining the problem.
(akpm: that'll cause the system to lock up on a non-preemptible
uniprocessor kernel)
(Guy: "Our customer was in fact running a uniprocessor machine, and they
reported a system hang.")
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Reported-by: Guy Streeter <streeter@xxxxxxxxxx>
Cc: Eric Paris <eparis@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/audit.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1107,7 +1107,7 @@ static inline void audit_get_stamp(struc
static void wait_for_auditd(unsigned long sleep_time)
{
DECLARE_WAITQUEUE(wait, current);
- set_current_state(TASK_INTERRUPTIBLE);
+ set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&audit_backlog_wait, &wait);
if (audit_backlog_limit &&
Patches currently in stable-queue which might be from oleg@xxxxxxxxxx are
queue-3.9/audit-wait_for_auditd-should-use-task_uninterruptible.patch
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