linux-kernel - Re: broken suspend (sched related) [Was: 2.6.24-rc4-mm1]

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <475AD59F.3010509@gmail.com>
Date:	Sat, 08 Dec 2007 18:34:23 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>
Subject: Re: broken suspend (sched related) [Was: 2.6.24-rc4-mm1]

On 12/08/2007 04:24 PM, Ingo Molnar wrote:
> i'm wondering why it had no effect now - the new code is in essence a 
> NOP over what we had. Could you send me your current (modified) 
> kernel/softlockup.c code?

Only these changes:
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index e50b44a..7011549 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -25,7 +25,7 @@ static DEFINE_PER_CPU(unsigned long, print_timestamp);
 static DEFINE_PER_CPU(struct task_struct *, watchdog_task);

 static int did_panic;
-int softlockup_thresh = 60;
+int softlockup_thresh = 10;

 static int
 softlock_panic(struct notifier_block *this, unsigned long event, void *ptr)
@@ -101,7 +101,11 @@ void softlockup_tick(void)

        now = get_timestamp(this_cpu);

-       /* Warn about unreasonable delays: */
+       /* Wake up the high-prio watchdog task every second: */
+       if (now > (touch_timestamp + 1))
+               wake_up_process(per_cpu(watchdog_task, this_cpu));
+
+       /* Warn about unreasonable 10+ seconds delays: */
        if (now <= (touch_timestamp + softlockup_thresh))
                return;

@@ -213,8 +217,9 @@ static int watchdog(void *__bind_cpu)
         * debug-printout triggers in softlockup_tick().
         */
        while (!kthread_should_stop()) {
+               set_current_state(TASK_INTERRUPTIBLE);
                touch_softlockup_watchdog();
-               msleep_interruptible(10000);
+               schedule();

                /*
                 * Only do the hung-tasks check on one CPU:


Whole file:
http://www.fi.muni.cz/~xslaby/sklad/softlockup.c
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/