linux-kernel - Re: kdump broken on 2.6.37-rc4

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Date:	Thu, 16 Dec 2010 11:58:30 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Vivek Goyal <vgoyal@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Maxim Uvarov <muvarov@...il.com>, linux-kernel@...r.kernel.org,
	Neil Horman <nhorman@...hat.com>
Subject: Re: kdump broken on 2.6.37-rc4

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@...12-3214-189-181) (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?

	-hpa
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