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

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