Re: x86: early boot crash: "alloc_low_page: ran out of memory" (bisected)

[Yinghai Lu <yinghai@kernel.org>]

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On Fri, Aug 9, 2013 at 7:10 PM, Yinghai Lu <yinghai@kernel.org> wrote:
> On Fri, Aug 9, 2013 at 6:19 PM, Dave Hansen <dave@sr71.net> wrote:
>> On 08/09/2013 04:23 PM, Yinghai Lu wrote:
>>> On Fri, Aug 9, 2013 at 4:18 PM, Dave Hansen <dave.hansen@intel.com> wrote:
>>>> I'm getting a 100% reproducible panic early in boot:
>> ...
>>>>> early console in setup code
>>>>> [    0.000000] Initializing cgroup subsys cpuset
>>>>> [    0.000000] Initializing cgroup subsys cpu
>>>>> [    0.000000] Linux version 3.8.0-rc5-00059-g8170e6b
>>>
>>> so how about v3.10?
>>>
>>> We should have some fixes in 3.10 already.
>>
>> I was hitting it on Linus's current tree today (3.11-rcwhatever).  I
>> pasted the panic() from your patch's commit specifically, but the same
>> behavior is happening on current kernels, and it looked consistent as I
>> bisected between the 3.11-rc's and your commit.
>
> Can you post 3.11-rc with "debug ignore_loglevel memblock=debug" ?
>

Can you try attached patch ?

Thanks

Yinghai

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diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 2ec29ac..f9eec80 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -78,8 +78,8 @@ __ref void *alloc_low_pages(unsigned int num)
 	return __va(pfn << PAGE_SHIFT);
 }
 
-/* need 4 4k for initial PMD_SIZE, 4k for 0-ISA_END_ADDRESS */
-#define INIT_PGT_BUF_SIZE	(5 * PAGE_SIZE)
+/* need 4 4k for initial PMD_SIZE,  3 4k for 0-ISA_END_ADDRESS */
+#define INIT_PGT_BUF_SIZE	(7 * PAGE_SIZE)
 RESERVE_BRK(early_pgt_alloc, INIT_PGT_BUF_SIZE);
 void  __init early_alloc_pgt_buf(void)
 {