From: Fengguang Wu <fengguang.wu@intel.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Avi Kivity <avi@redhat.com>, Steven Rostedt <srostedt@redhat.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
LKML <linux-kernel@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: Testing tracer wakeup_rt: .. no entries found ..FAILED!
Date: Wed, 1 Aug 2012 07:43:36 +0800 [thread overview]
Message-ID: <20120731234336.GA5526@localhost> (raw)
In-Reply-To: <1343740419.27983.33.camel@gandalf.stny.rr.com>
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
next prev parent reply other threads:[~2012-07-31 23:43 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20120724090330.GA9830@localhost>
[not found] ` <20120724090720.GA10434@localhost>
[not found] ` <1343663105.3847.7.camel@fedora>
2012-07-31 12:17 ` Testing tracer wakeup_rt: .. no entries found ..FAILED! Fengguang Wu
2012-07-31 12:37 ` Avi Kivity
2012-07-31 12:43 ` Steven Rostedt
2012-07-31 12:50 ` Avi Kivity
2012-07-31 13:13 ` Steven Rostedt
2012-07-31 23:43 ` Fengguang Wu [this message]
2012-07-31 23:51 ` Steven Rostedt
2012-07-31 23:57 ` Paul E. McKenney
2012-08-01 0:09 ` Steven Rostedt
2012-08-01 0:18 ` Paul E. McKenney
2012-08-01 0:43 ` pci_get_subsys: GFP_KERNEL allocations with IRQs disabled Fengguang Wu
2012-08-22 2:50 ` Fengguang Wu
2012-08-22 7:49 ` Feng Tang
2012-08-22 13:02 ` Fengguang Wu
2012-08-22 18:02 ` Bjorn Helgaas
2012-08-23 5:45 ` Feng Tang
2012-08-23 7:45 ` [PATCH 1/2] PCI: Use local parameter pci_device_id for pci_get_subsys/class() Feng Tang
2012-09-08 1:00 ` Yinghai Lu
2012-09-08 1:32 ` Yinghai Lu
2012-09-08 1:59 ` Greg Kroah-Hartman
2012-09-08 13:42 ` Fengguang Wu
2012-09-08 15:30 ` Yinghai Lu
2012-09-08 15:34 ` Feng Tang
2012-09-08 18:40 ` Yinghai Lu
2012-09-08 21:06 ` Bjorn Helgaas
2012-08-23 7:45 ` [PATCH 2/2] PCI: Remove the obsolete no_pci_devices() check Feng Tang
2012-07-31 23:57 ` Testing tracer wakeup_rt: .. no entries found ..FAILED! Fengguang Wu
2012-08-07 13:29 ` Steven Rostedt
2012-08-07 13:32 ` Fengguang Wu
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