linux-kernel - Re: Testing tracer wakeup_rt: .. no entries found ..FAILED!

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Date:	Wed, 1 Aug 2012 07:43:36 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Avi Kivity <avi@...hat.com>, Steven Rostedt <srostedt@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: Testing tracer wakeup_rt: .. no entries found ..FAILED!

On Tue, Jul 31, 2012 at 09:13:39AM -0400, Steven Rostedt wrote:
> On Tue, 2012-07-31 at 15:50 +0300, Avi Kivity wrote:
> > On 07/31/2012 03:43 PM, Steven Rostedt wrote:
> 
> > That would be better.  A hypervisor might be real-time capable (with
> > some effort kvm can do this), so we don't want to turn off real time
> > features just based on that.
> 
> It would only turn off if you enable selftests and the timing falied. If
> the kvm had real time features, this most likely would fail anyway. But
> that said, here's a patch that should solve this:

No luck.. it still fails:

[    2.360068] Testing tracer irqsoff: [    2.854529] 
[    2.854828] ===============================
[    2.855560] [ INFO: suspicious RCU usage. ]
[    2.856266] 3.5.0-00024-g01ff5db-dirty #3 Not tainted
[    2.857182] -------------------------------
[    2.857933] /c/wfg/linux/include/linux/rcupdate.h:730 rcu_read_lock() used illegally while idle!
[    2.859450] 
[    2.859450] other info that might help us debug this:
[    2.859450] 
[    2.860874] 
[    2.860874] RCU used illegally from idle CPU!
[    2.860874] rcu_scheduler_active = 1, debug_locks = 0
[    2.862754] RCU used illegally from extended quiescent state!
[    2.863741] 2 locks held by swapper/0/0:

[    2.864377]  #0: [    2.864423]  (max_trace_lock){......}, at: [<814f6bfe>] check_critical_timing+0xd7/0x286
[    2.864423]  #1:  (rcu_read_lock){.+.+..}, at: [<8116f930>] __update_max_tr+0x0/0x430

[    2.864423] stack backtrace:
[    2.864423] Pid: 0, comm: swapper/0 Not tainted 3.5.0-00024-g01ff5db-dirty #3
[    2.864423] Call Trace:
[    2.864423]  [<81103a06>] lockdep_rcu_suspicious+0x1c6/0x210
[    2.864423]  [<8116fc9a>] __update_max_tr+0x36a/0x430
[    2.864423]  [<8116f930>] ? tracing_record_cmdline+0x200/0x200
[    2.864423]  [<8117186e>] update_max_tr_single+0x14e/0x2c0
[    2.864423]  [<81170baa>] ? __trace_stack+0x2a/0x40
[    2.864423]  [<814f6d22>] check_critical_timing+0x1fb/0x286
[    2.864423]  [<81013313>] ? default_idle+0x593/0xc30
[    2.864423]  [<81013313>] ? default_idle+0x593/0xc30
[    2.864423]  [<8110a0e7>] ? trace_hardirqs_on+0x27/0x40
[    2.864423]  [<8117ea5e>] time_hardirqs_on+0x1de/0x220
[    2.864423]  [<81013313>] ? default_idle+0x593/0xc30
[    2.864423]  [<81109d6d>] trace_hardirqs_on_caller+0x2d/0x380
[    2.864423]  [<8110a0e7>] trace_hardirqs_on+0x27/0x40
[    2.864423]  [<81013313>] default_idle+0x593/0xc30
[    2.864423]  [<8101692d>] cpu_idle+0x2dd/0x390
[    2.864423]  [<814eb841>] rest_init+0x2f5/0x314
[    2.864423]  [<814eb54c>] ? __read_lock_failed+0x14/0x14
[    2.864423]  [<817a43b4>] start_kernel+0x866/0x87a

Thanks,
Fengguang
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