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    SubjectRe: kdump broken on 2.6.37-rc4
    On 12/16/2010 11:58 AM, H. Peter Anvin wrote:
    > On 12/16/2010 09:28 AM, Yinghai Lu wrote:
    >>
    >> the brk is complaining if i change that to
    >>
    >> if (end > ((-__PAGE_OFFSET-(128 <<20)-1) & 0x7fffffff))
    >> error("Destination address too large");
    >>
    >> brk is complaining when try to get more for dmi ...
    >> ...
    >> I'm in purgatory
    >> bootconsole [uart0] enabled
    >> Kernel Layout:
    >> .text: [0x2e000000-0x2e3f08ca]
    >> .rodata: [0x2e3f2000-0x2e5a2fff]
    >> .data: [0x2e5a3000-0x2e5f6467]
    >> .init: [0x2e5f7000-0x2e670fff]
    >> .bss: [0x2e675000-0x2e76ffff]
    >> .brk: [0x2e770000-0x2e894fff]
    >> memblock_x86_reserve_range: [0x00001000-0x00001fff] EX TRAMPOLINE
    >> memblock_x86_reserve_range: [0x2e000000-0x2e76ffff] TEXT DATA BSS
    >> memblock_x86_reserve_range: [0x35bdd000-0x35f49fff] RAMDISK
    >> memblock_x86_reserve_range: [0x0009c800-0x000fffff] * BIOS reserved
    >> Initializing cgroup subsys cpuset
    >> Initializing cgroup subsys cpu
    >> Linux version 2.6.37-rc5-tip+ (root@mpk12-3214-189-181) (gcc version 4.4.4 20100726 (Red Hat 4.4.4-13) (GCC) ) #4 SMP Wed Dec 15 11:04:32 PST 2010
    >> KERNEL supported cpus:
    >> Intel GenuineIntel
    >> AMD AuthenticAMD
    >> NSC Geode by NSC
    >> Cyrix CyrixInstead
    >> Centaur CentaurHauls
    >> Transmeta GenuineTMx86
    >> Transmeta TransmetaCPU
    >> UMC UMC UMC UMC
    >> BIOS-provided physical RAM map:
    >> BIOS-e820: [0x00000000000100-0x0000000009c7ff] (usable)
    >> BIOS-e820: [0x0000000009c800-0x0000000009ffff] (reserved)
    >> BIOS-e820: [0x000000000e0000-0x000000000fffff] (reserved)
    >> BIOS-e820: [0x00000000100000-0x0000007ff9ffff] (usable)
    >> BIOS-e820: [0x0000007ffae000-0x0000007ffaffff] (usable)
    >> BIOS-e820: [0x0000007ffb0000-0x0000007ffbdfff] (ACPI data)
    >> BIOS-e820: [0x0000007ffbe000-0x0000007ffeffff] (ACPI NVS)
    >> BIOS-e820: [0x0000007fff0000-0x0000007fffffff] (reserved)
    >> BIOS-e820: [0x000000e0000000-0x000000efffffff] (reserved)
    >> BIOS-e820: [0x000000fec00000-0x000000fec00fff] (reserved)
    >> BIOS-e820: [0x000000fee00000-0x000000feefffff] (reserved)
    >> BIOS-e820: [0x000000ff700000-0x000000ffffffff] (reserved)
    >> last_pfn = 0x7ffb0 max_arch_pfn = 0x1000000
    >> NX (Execute Disable) protection: active
    >> user-defined physical RAM map:
    >> user: [0x00000000000000-0x0000000009ffff] (usable)
    >> user: [0x0000002e000000-0x00000035f59fff] (usable)
    >> user: [0x0000007ffb0000-0x0000007ffeffff] (ACPI data)
    >> DMI present.
    >> BUG: Int 6: CR2 (null)
    >> EDI 00000019 ESI ff940c18 EBP (null) ESP ee5a5e84
    >> EBX ee5cfb68 EDX 00000006 ECX 00000019 EAX ee8e6019
    >> err (null) EIP ee5fb4dd CS 00000060 flg 00010002
    >> Stack: 00000019 ee62bf45 ff942000 00000563 00000001 ff940c00 000018c7 ee62bf83
    >> ff940c00 ee62c063 80000000 ee3e6f2f ee50a3c0 ee5a5ed4 ff940c00 ff940c43
    >> 000018c7 (null) ee3173d4 000018c8 0000007f ff940c00 ff90b1bf ee5a5f18
    >> Pid: 0, comm: swapper Not tainted 2.6.37-rc5-tip+ #4
    >> Call Trace:
    >> [<ee3dd1d5>] ? hlt_loop+0x0/0x3
    >> [<ee5fb4dd>] ? extend_brk+0x31/0x44
    >
    > I'm assuming it bails due to:
    >
    > BUG_ON((char *)(_brk_end + size) > __brk_limit);
    >
    > ... could you find out what _brk_end and __brk_limit are?

    void __init print_kernel_layout(void)
    {
    printk("Kernel Layout:\n");
    printk(" .text: [%#010lx-%#010lx]\n", __pa_symbol(&_text), __pa_symbol(&_etext) - 1);
    printk(".rodata: [%#010lx-%#010lx]\n", __pa_symbol(&__start_rodata), __pa_symbol(&__end_rodata) - 1);
    printk(" .data: [%#010lx-%#010lx]\n", __pa_symbol(&_sdata), __pa_symbol(&_edata) - 1);
    printk(" .init: [%#010lx-%#010lx]\n", __pa_symbol(&__init_begin), __pa_symbol(&__init_end) - 1);
    printk(" .bss: [%#010lx-%#010lx]\n", __pa_symbol(&__bss_start), __pa_symbol(&__bss_stop) - 1);
    printk(" .brk: [%#010lx-%#010lx]\n", __pa_symbol(&__brk_base), __pa_symbol(&__brk_limit) - 1);
    }

    >> Kernel Layout:
    >> .text: [0x2e000000-0x2e3f08ca]
    >> .rodata: [0x2e3f2000-0x2e5a2fff]
    >> .data: [0x2e5a3000-0x2e5f6467]
    >> .init: [0x2e5f7000-0x2e670fff]
    >> .bss: [0x2e675000-0x2e76ffff]
    >> .brk: [0x2e770000-0x2e894fff]

    DMI present.
    _brk_end: ee8e6000, __brk_limit: ee895000



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