linux-kernel - Re: ftrace WARNING during boot

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Date:	Sat, 3 Oct 2009 14:28:50 +0300
From:	Matti Aarnio <matti.aarnio@...iler.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: ftrace WARNING during boot

On Sat, Oct 03, 2009 at 01:00:03PM +0200, Frederic Weisbecker wrote:
> On Sat, Oct 03, 2009 at 01:53:18PM +0300, Matti Aarnio wrote:
> > This is perhaps already fixed, as I have two a bit newer kernels than this one,
> > but reporting is better than being silent..
> 
> 
> Hi,
> 
> Which kernel is this? Does it happen in the current 2.6.32-rc1 ?

I do know that reading the trace is difficult, but the asked for information
is down in there.  Intentionally put there by the kernel-oops coders, I presume.

I do use vendor kernels, and Fedora 12 beta program has not yet made
2.6.32-rc1 kernel available.

However this does not appear in 2.6.31.1-56.fc12.x86_64 kernel that is lattest
from vendor, but there I have some other troubles why I took a bit older kernel.
(Other troubles with the xfs filesystem lock handling.)

> Thanks.

  Best regards,  Matti Aarnio

> >   .....................
> >  kernel: rtc_cmos 00:04: setting system clock to 2009-10-02 23:21:17 UTC (1254525677)
> >  kernel: Initalizing network drop monitor service
> >  kernel: Freeing unused kernel memory: 3196k freed
> >  kernel: NX-protecting the kernel data: ffffffff8150e000, 4469 pages
> >  kernel: Write protecting the kernel read-only data: 7392k
> >  kernel: dracut: dracut-002-2.gitc53acc30.fc12
> >  kernel: udev: starting version 145
> >  kernel: usb 1-5: new high speed USB device using ehci_hcd and address 4
> >  kernel: ------------[ cut here ]------------
> >  kernel: WARNING: at kernel/trace/ftrace.c:1003 ftrace_bug+0x198/0x27e() (Not tainted)
> >  kernel: Hardware name: System Product Name
> >  kernel: Modules linked in: i2c_core(+)
> >  kernel: Pid: 87, comm: modprobe Not tainted 2.6.31-33.fc12.x86_64 #1
> >  kernel: Call Trace:
> >  kernel: [<ffffffff810642ec>] warn_slowpath_common+0x95/0xc3
> >  kernel: [<ffffffffa0003072>] ? i2c_new_dummy+0x8/0x5e [i2c_core]
> >  kernel: [<ffffffff81064341>] warn_slowpath_null+0x27/0x3d
> >  kernel: [<ffffffff810d4ace>] ftrace_bug+0x198/0x27e
> >  kernel: [<ffffffffa0003072>] ? i2c_new_dummy+0x8/0x5e [i2c_core]
> >  kernel: [<ffffffff810d5d26>] ftrace_convert_nops+0x201/0x2b9
> >  kernel: [<ffffffffa0003072>] ? i2c_new_dummy+0x8/0x5e [i2c_core]
> >  kernel: [<ffffffff810d5e2a>] ftrace_module_notify+0x4c/0x7f
> >  kernel: [<ffffffff81509c65>] notifier_call_chain+0x72/0xba
> >  kernel: [<ffffffff81086e71>] ? __blocking_notifier_call_chain+0x4c/0x8e
> >  kernel: [<ffffffff81086e88>] __blocking_notifier_call_chain+0x63/0x8e
> >  kernel: [<ffffffff81086eda>] blocking_notifier_call_chain+0x27/0x3d
> >  kernel: [<ffffffff810a472a>] sys_init_module+0xb7/0x249
> >  kernel: [<ffffffff81011f42>] system_call_fastpath+0x16/0x1b
> >  kernel: ---[ end trace fbf9054ae0f212c7 ]---
> >  kernel: ftrace faulted on writing [<ffffffffa0003072>] i2c_new_dummy+0x8/0x5e [i2c_core]
> >  kernel: usb 1-5: New USB device found, idVendor=0424, idProduct=2504
> >  kernel: usb 1-5: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> >  kernel: usb 1-5: configuration #1 chosen from 1 choice
> >  kernel: hub 1-5:1.0: USB hub found
> >  kernel: hub 1-5:1.0: 4 ports detected
> >   ..................
> > --
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