linux-kernel - Re: [BUG] [ tip/sched/core ] System unresponsive after booting

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Message-ID: <52D690DE.8080507@linaro.org>
Date:	Wed, 15 Jan 2014 14:45:02 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
CC:	raistlin@...ux.it, juri.lelli@...il.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] [ tip/sched/core ] System unresponsive after booting

On 01/15/2014 01:24 PM, Ingo Molnar wrote:
>
> * Peter Zijlstra <peterz@...radead.org> wrote:
>
>> On Wed, Jan 15, 2014 at 09:27:34AM +0100, Daniel Lezcano wrote:
>>>
>>> Hi all,
>>>
>>> I use the tip/sched/core branch.
>>>
>>> After git pulling yesterday, my host is unresponsive after booting the OS.
>>>
>>>   * It boots normally
>>>   * It sends info to the console
>>>   * The graphics does not work
>>>   * The terminals show the prompt, I can enter the username but after
>>> pressing enter, it does not give the password prompt
>>>   * sysrq works more or less, I can't get the process stack but it receives
>>> the command
>>>
>>> It is like no new process can be created.
>>>
>>> I have a dual Xeon processor E5325 (2 x 4 cores).
>>>
>>> After git bisecting, the following patch seems to introduce the bug.
>>>
>>> commit d50dde5a10f305253cbc3855307f608f8a3c5f73
>>
>> OK, so my headless WSM-EP boots just fine. Obviously it cannot confirm
>> if graphics works, but I can ssh in and work on it without bother.
>>
>> I can even log in on the serial console without problems.
>>
>> I tried both tip/master and tip/sched/core.
>
> I too booted various sytems and have yet to notice similar oddity.

Ok, I was able to boot and use the system with init=/bin/bash and a 
busybox but the ubuntu distro ends up to block after booting. So I guess 
there a service triggering something in the kernel leading to this issue.


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