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Date: Sat, 09 Jun 2012 01:13:23 +0800
From: ZhouPing Liu <zliu@redhat.com>
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To: "Peter Zijlstra" <a.p.zijlstra@chello.nl>,
        Andrea Arcangeli <aarcange@redhat.com>
CC: Linus Torvalds <torvalds@linux-foundation.org>,
        Hillf Danton <dhillf@gmail.com>, hi3766691@gmail.com,
        LKML <linux-kernel@vger.kernel.org>
Subject: Kernel panic - not syncing: Attempted to kill the idle task!
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hi,

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!

whole console log is here: 
http://www.sanweiying.org/download/debug_kernel/kernel_panic_48d212a2eecaca
and config file is 
http://www.sanweiying.org/download/debug_kernel/config_48d212a2eecaca

and I have tested different branches, more details is available in 
https://lkml.org/lkml/2012/6/6/704
here I do a simple summary:
  a), mainline, 
v3.4:                                                         no such panic
  b), mainline, v3.5-rc1(commit: 48d212a2eecaca),     yes
  c), Andrea's tree, autonuma15                                     yes
  d), tip/master(commit:b2f5ce55c4e68370)                no such panic

let me know if you need any info.

Thanks,
Zhouping
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