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

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Date:	Wed, 15 Jan 2014 09:27:34 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	raistlin@...ux.it, juri.lelli@...il.com
CC:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] [ tip/sched/core ] System unresponsive after booting


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
Author: Dario Faggioli <raistlin@...ux.it>
Date:   Thu Nov 7 14:43:36 2013 +0100

     sched: Add new scheduler syscalls to support an extended scheduling 
parameters ABI

     Add the syscalls needed for supporting scheduling algorithms
     with extended scheduling parameters (e.g., SCHED_DEADLINE).


[ ... ]


     Signed-off-by: Dario Faggioli <raistlin@...ux.it>
     [ Rewrote to use sched_attr. ]
     Signed-off-by: Juri Lelli <juri.lelli@...il.com>
     [ Removed sched_setscheduler2() for now. ]
     Signed-off-by: Peter Zijlstra <peterz@...radead.org>
     Link: 
http://lkml.kernel.org/r/1383831828-15501-3-git-send-email-juri.lelli@gmail.com
     Signed-off-by: Ingo Molnar <mingo@...nel.org>

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