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    SubjectRe: 3.13 hangs when I tried to start a KVM at a 32 bit stable Gentoo
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    On 01/23/2014 07:55 PM, Dave Hansen wrote:
    > On 01/21/2014 08:38 AM, Toralf Förster wrote:
    >> Jan 21 17:18:57 n22 kernel: INFO: rcu_sched self-detected stall on CPU { 2} (t=60001 jiffies g=18494 c=18493 q=183951)
    >> Jan 21 17:18:57 n22 kernel: sending NMI to all CPUs:
    >> Jan 21 17:18:57 n22 kernel: NMI backtrace for cpu 2
    >> Jan 21 17:18:57 n22 kernel: CPU: 2 PID: 6779 Comm: qemu-system-x86 Not tainted 3.13.0 #3
    >> Jan 21 17:18:57 n22 kernel: Hardware name: LENOVO 4180F65/4180F65, BIOS 83ET75WW (1.45 ) 05/10/2013
    >> Jan 21 17:18:57 n22 kernel: task: e921c370 ti: e5f36000 task.ti: e5f36000
    >
    > I'm seeing a very similar hang with an ubuntu guest and a custom kernel.
    > I'm on commit 0dc3fd0249a, and it's 100% reproducible every time I run KVM.
    >
    > Cc-ing a few more folks...
    >

    I tried to bisect it - the first attempt to bisetc it between v3.12. and v3.13 blamed this commit :

    commit 37bf06375c90a42fe07b9bebdb07bc316ae5a0ce
    Merge: 6bfa687 d0e639c
    Author: Ingo Molnar <mingo@kernel.org>
    Date: Wed Oct 9 12:36:13 2013 +0200

    Merge tag 'v3.12-rc4' into sched/core

    Merge Linux v3.12-rc4 to fix a conflict and also to refresh the tree
    before applying more scheduler patches.

    Conflicts:
    arch/avr32/include/asm/Kbuild

    Signed-off-by: Ingo Molnar <mingo@kernel.org>


    which seems rather to be the upper limit where to search for the first bad commit, or ?



    - --
    MfG/Sincerely
    Toralf Förster
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