> Will try that in the next few days... sorry for the delay. I was on
> vacation for the last 2 weeks and thus, out of town :D
>
>
>
> ----- Original Message -----
> From: "Neil Horman" <nhorman@tuxdriver.com>
> To: "Andrew Morton" <akpm@linux-foundation.org>
> Cc: <netdev@vger.kernel.org>; <bugzilla-daemon@bugzilla.kernel.org>;
> <bugme-daemon@bugzilla.kernel.org>; <hilld@binarystorm.net>
> Sent: Tuesday, June 23, 2009 9:05 PM
> Subject: Re: [Bugme-new] [Bug 13553] New: When NETCONSOLE is enabled
> inkernel, computer crashes after 120seconds (approx)
>
>
>> On Tue, Jun 23, 2009 at 02:07:43PM -0700, Andrew Morton wrote:
>>>
>>> (switched to email. Please respond via emailed reply-to-all, not via
>>> the
>>> bugzilla web interface).
>>>
>>> On Wed, 17 Jun 2009 01:55:54 GMT
>>>
bugzilla-daemon@bugzilla.kernel.org wrote:
>>>
>>> >
http://bugzilla.kernel.org/show_bug.cgi?id=13553
>>> >
>>> > Summary: When NETCONSOLE is enabled in kernel, computer
>>> > crashes
>>> > after 120seconds (approx)
>>> > Product: Networking
>>> > Version: 2.5
>>> > Kernel Version: 2.6.29.4, 2.6.30
>>> > Platform: All
>>> > OS/Version: Linux
>>> > Tree: Mainline
>>> > Status: NEW
>>> > Severity: high
>>> > Priority: P1
>>> > Component: Other
>>> > AssignedTo:
acme@ghostprotocols.net
>>> > ReportedBy:
hilld@binarystorm.net
>>> > Regression: No
>>> >
>>> >
>>>
>>> > 00:00.0 Host bridge: Intel Corporation 440GX - 82443GX Host bridge
>>> > 00:01.0 PCI bridge: Intel Corporation 440GX - 82443GX AGP bridge
>>> > 00:07.0 ISA bridge: Intel Corporation 82371AB/EB/MB PIIX4 ISA (rev 02)
>>> > 00:07.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev
>>> > 01)
>>> > 00:07.2 USB Controller: Intel Corporation 82371AB/EB/MB PIIX4 USB (rev
>>> > 01)
>>> > 00:07.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 02)
>>> > 00:0b.0 SCSI storage controller: Adaptec AIC-7896U2/7897U2
>>> > 00:0b.1 SCSI storage controller: Adaptec AIC-7896U2/7897U2
>>> > 00:0d.0 Ethernet controller: Intel Corporation 82557/8/9/0/1 Ethernet
>>> > Pro 100
>>> > (rev 08)
>>> > 00:12.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
>>> > RTL-8139/8139C/8139C+ (rev 10)
>>> > 01:00.0 VGA compatible controller: ATI Technologies Inc Rage 128 RL/VR
>>> > AGP
>>> >
>>> > ------- Comment #2 From David Hill 2009-06-17 02:55:56 (-)
>>> > [reply] -------
>>> >
>>> > With NETCONSOLE enabled, if I type:
>>> > ethtool -s eth1 speed 100 duplex full autoneg on
>>> >
>>> > the computer freezes with kernel 2.6.29.4 and 2.6.30...
>>> >
>>> > I can reproduce it anytime you want.
>>> >
>>>
>>> Interesting. I wonder what the significance is of the 120 seconds. I
>>> see no such timers in e100.c. Does the networking core have timers on
>>> such intervals?
>>>
>> My guess is the 120 seconds has less to do with the driver, and more to
>> do with
>> some other periodic event in the kernel that triggers a message getting
>> written
>> to the console, which in turn triggers whatever deadlock it is thats
>> getting hit
>> here. I imagine we could diagnose it pretty quick if a stack trace or
>> vmcore
>> could be captured on this. David, can you enable the NMI watchdog on
>> this
>> system to trigger a panic on the system after a deadlock? Then if you
>> could
>> enable a second serial console, or setup kdump to capture a vmcore on
>> this
>> system, we should be able to figure out whats going on. My guess is
>> that in
>> the e100 driver we're taking a lock in the ethtool set path, then calling
>> printk, which winds up recursing into the driver, trying to take the same
>> lock
>> again. A stack trace will tell us for certain.
>>
>> Regards
>> Neil
>>
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>
