linux-kernel - Re: [crash] Re: Latest brk patchset

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Date:	Sun, 15 Mar 2009 22:28:54 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Yinghai Lu <yinghai@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [crash] Re: Latest brk patchset


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Ingo Molnar wrote:
>> * Jeremy Fitzhardinge <jeremy@...p.org> wrote:
>>
>>   
>>> H. Peter Anvin wrote:
>>>     
>>>> Well, the semantics are different; the .bss section is zeroed while the
>>>> brk isn't, and the brk symbols don't necessarily point to the data
>>>> associated with those particular symbols, unlike (of course) the bss.
>>>>
>>>> It's not a big issue, obviously, it just seems cleaner to me that way.
>>>>         
>>> OK, I just added a couple of changes to:
>>>
>>>    * make the brk reservation symbols have the form ".brk.NAME" to make
>>>      them inaccessible from C, and to make them look obviously
>>>      different from normal symbols (more like sections, since it is
>>>      their size that's more important than their address)
>>>    * Put all the brk stuff in a .brk section
>>>    * Mention alignment in the comment for the slop space
>>>
>>>    J
>>>
>>> The following changes since commit 1e08816af0bc345995c3f26ce4eaba1171ffb531:
>>>  Ingo Molnar (1):
>>>        Merge branch 'linus'
>>>
>>> are available in the git repository at:
>>>
>>>  git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git push/x86/brk
>>>     
>>
>> the previous kit in tip:x86/setup-memory is causing crashes. One of 
>> them is:
>>
>> init_memory_mapping: 0000000000000000-00000000377fe000                  
>>              0000000000 - 00377fe000 page 4k                            
>>                         Kernel panic - not syncing: Cannot find space 
>> for the kernel page tables            Pid: 0, comm: swapper Not tainted 
>> 2.6.29-rc8-tip-02516-g83219b0-dirty #35476        Call Trace:           
>>                                                                
>> [<c0128b7b>] panic+0x4b/0x100                                           
>>             [<c074a989>] init_memory_mapping+0x429/0x430                
>>                         [<c0cde790>] setup_arch+0x430/0x890             
>>                                     [<c0148f4e>] ? 
>> lockdep_init_map+0x2e/0x150                                          
>> [<c036f392>] ? __spin_lock_init+0x32/0x60                               
>>             [<c01298d0>] ? printk+0x20/0x30                             
>>                         [<c0cdc966>] start_kernel+0xc6/0x330            
>>                                     [<c0cdc321>] 
>> i386_start_kernel+0x41/0x50               
>>
>> full crashlog below, config attached.
>>   
>
> What branch is this?  I'm trying to build with your config 
> with current tip/master w/ tip/x86/setup-memory merged into 
> it, but "make ARCH=i386 oldconfig" is asking me about 
> CONFIG_SMP, which makes me think the config file is 
> incomplete.

just accept the defaults in 'make oldconfig' and you'll get the 
right config.

	Ingo
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