linux-kernel - Re: [PATCH 0/2 v3] [GIT PULL] tracing/events: add the _

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Date:	Sun, 19 Apr 2009 14:34:32 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Zhaolei <zhaolei@...fujitsu.com>,
	Tom Zanussi <tzanussi@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 0/2 v3] [GIT PULL] tracing/events: add the __string
	field

On Sun, Apr 19, 2009 at 02:14:54PM +0800, Li Zefan wrote:
> Frederic Weisbecker wrote:
> > Hi,
> > 
> > Here is the v3 of the __string() field patchset.
> > It applies suggestions from Steven and Peter with some arrangements.
> > 
> > This time, filtering is not supported (though it is ready in a pending patch).
> > I wanted to provide it but it looks like filtering has been broken recently.
> > Once I set a usual string filter, no more traces appear, and clearing it
> > doesn't change anything.
> > 
> 
> I tried it, and triggered a WARNING, and ring buffers was
> disabled permanently:


I've also seen this warning but on another event.
I don't think this is related to this patchset but
more about the tracing recursion detection.

For exemple, here we are in an Irq event, which doesn't
use the __string() thing. For such off-case, the only change
is a variable declaration and a + 0 operation.

Another thing: I've only seen it in a selftest.

I will investigate.
Thanks.

Frederic.


> 
> ------------[ cut here ]------------
> WARNING: at kernel/trace/ring_buffer.c:1501 ring_buffer_lock_reserve+0x78/0x122()
> Hardware name: Aspire SA85
> Modules linked in: autofs4 parport_pc parport button sg r8169 mii sata_sis pata_sis ata_generic libata sd_mod scsi_mod ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd [last unloaded: scsi_wait_scan]
> Pid: 0, comm: swapper Not tainted 2.6.30-rc2-tip #84
> Call Trace:
>  [<c0431d8d>] warn_slowpath+0x79/0x8f
>  [<c0468379>] ? __rcu_read_unlock+0x70/0x7f
>  [<c045022b>] ? trace_hardirqs_off+0xb/0xd
>  [<c0468379>] ? __rcu_read_unlock+0x70/0x7f
>  [<c045022b>] ? trace_hardirqs_off+0xb/0xd
>  [<c0468379>] ? __rcu_read_unlock+0x70/0x7f
>  [<c063784b>] ? _spin_unlock_irqrestore+0x34/0x5d
>  [<c0450200>] ? trace_hardirqs_off_caller+0x8f/0xaf
>  [<c04718fa>] ring_buffer_lock_reserve+0x78/0x122
>  [<c0473f17>] trace_buffer_lock_reserve+0x11/0x34
>  [<c0474399>] trace_current_buffer_lock_reserve+0x19/0x1e
>  [<c0465299>] ftrace_raw_event_irq_handler_exit+0x34/0x73
>  [<c0464fdb>] handle_IRQ_event+0xcc/0x169
>  [<c0466bc0>] handle_fasteoi_irq+0x77/0xb0
>  [<c0466b49>] ? handle_fasteoi_irq+0x0/0xb0
>  <IRQ>  [<c0637d76>] ? do_IRQ+0x4e/0xa3
>  [<c04030ee>] ? common_interrupt+0x2e/0x34
>  [<c045007b>] ? lockdep_init_map+0x2d5/0x39f
>  [<c04092b3>] ? mwait_idle+0xab/0x100
>  [<c0401b4e>] ? cpu_idle+0x53/0x85
>  [<c0631fb5>] ? start_secondary+0x1aa/0x1b1
> ---[ end trace ab1a6955379aeb3f ]---
> 
> 

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