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

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Message-ID: <49BD70EF.7010204@goop.org>
Date:	Sun, 15 Mar 2009 14:19:43 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
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

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.

    J
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