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    SubjectRe: Kernel panic - not syncing: Attempted to kill the idle task!


    ----- Original Message -----
    > From: "Peter Zijlstra" <a.p.zijlstra@chello.nl>
    > To: "ZhouPing Liu" <zliu@redhat.com>
    > Cc: "Andrea Arcangeli" <aarcange@redhat.com>, "Linus Torvalds" <torvalds@linux-foundation.org>, "Hillf Danton"
    > <dhillf@gmail.com>, hi3766691@gmail.com, "LKML" <linux-kernel@vger.kernel.org>
    > Sent: Saturday, June 9, 2012 2:46:57 AM
    > Subject: Re: Kernel panic - not syncing: Attempted to kill the idle task!
    >
    > On Sat, 2012-06-09 at 01:13 +0800, ZhouPing Liu wrote:
    >
    > > kernel panic on mainline(commit: 48d212a2eecaca) with a large
    > > system, which
    > > has 120Gb RAM & 8 numa nodes:
    > >
    > > ... [cut here] ...
    > > [ 3.404017] Call Trace:
    > > [ 3.404553] [<ffffffff810afd19>] find_busiest_group+0x39/0x4b0
    > > [ 3.406188] [<ffffffff810b0295>] load_balance+0x105/0xa50
    > > [ 3.407444] [<ffffffff810ce2ed>] ? trace_hardirqs_off+0xd/0x10
    > > [ 3.408695] [<ffffffff810aa1cf>] ? local_clock+0x6f/0x80
    > > [ 3.409789] [<ffffffff810b11b0>] idle_balance+0x130/0x2d0
    > > [ 3.410879] [<ffffffff810b10d0>] ? idle_balance+0x50/0x2d0
    > > [ 3.411996] [<ffffffff8167f340>] __schedule+0x910/0xa00
    > > [ 3.413204] [<ffffffff8167f769>] schedule+0x29/0x70
    > > [ 3.414324] [<ffffffff8102352f>] cpu_idle+0x12f/0x140
    > > [ 3.415433] [<ffffffff81667765>] start_secondary+0x262/0x264
    > > [ 3.416763] Code: 44 8b bd 7c ff ff ff 45 85 ff 0f 85 30 02 00
    > > 00 48
    > > 8b bd 48 ff ff ff 48 8b 4f 10 4c 8b 45 98 8b 71 04 31 d2 4c 89 c0
    > > 48 c1
    > > e0 0a <48> f7 f6 48 8b 75 a0 48 85 f6 48 89 c7 49 89 c1 48 89 45 90
    > > 0f
    > > [ 3.420335] RIP [<ffffffff810af93b>]
    > > update_sd_lb_stats+0x27b/0x620
    > > [ 3.421664] RSP <ffff88041922fb48>
    > > [ 3.422473] ---[ end trace 04b848dd1c06d585 ]---
    > > [ 3.423472] Kernel panic - not syncing: Attempted to kill the
    > > idle task!
    >
    > > here I do a simple summary:
    >
    > > b), mainline, v3.5-rc1(commit: 48d212a2eecaca), yes
    > > d), tip/master(commit:b2f5ce55c4e68370) no such
    > > panic
    > >
    > > let me know if you need any info.
    >
    > There's a number of patches in tip/sched/urgent that I think fix this
    > (hence your D) and these should make their way to Linus shortly.
    >
    > That said, can you provide me your node distance table so I can
    > verify
    > locally?
    >
    > cat /sys/devices/system/node/node*/distance

    # cat /sys/devices/system/node/node*/distance
    10 17 17 24 24 24 30 30
    18 10 30 18 18 24 24 24
    18 24 10 24 24 17 30 30
    24 18 23 10 24 17 17 30
    24 17 24 24 10 18 30 18
    31 24 17 18 18 10 24 24
    30 24 30 17 24 24 10 18
    30 24 30 24 17 24 17 10

    --
    Thanks,
    Zhouping


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