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

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Date:	Sun, 15 Mar 2009 21:38:02 +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: [crash] Re: Latest brk patchset


* 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.

	Ingo

--------------->
kernel /boot/bzImage-32 root=/dev/sda1 earlyprintk=serial,ttyS0,115200,keep con
sole=tty debug initcall_debug enforcing=0 apic=verbose ignore_loglevel sysrq_al
ways_enabled selinux=0 nmi_watchdog=0 3 panic=1
   [Linux-bzImage, setup=0x2a00, size=0x556aa0]

Linux version 2.6.29-rc8-tip-02516-g83219b0-dirty (mingo@...ne) (gcc version 4.2.2) #35476 Sun Mar 15 18:17:42 CET 2009
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: 0000000000000000 - 000000000009f800 (usable)
 BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 000000003fff0000 (usable)
 BIOS-e820: 000000003fff0000 - 000000003fff3000 (ACPI NVS)
 BIOS-e820: 000000003fff3000 - 0000000040000000 (ACPI data)
 BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
 BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
console [earlyser0] enabled
debug: ignoring loglevel setting.
DMI 2.3 present.
last_pfn = 0x3fff0 max_arch_pfn = 0x100000
MTRR default type: uncachable
MTRR fixed ranges enabled:
  00000-9FFFF write-back
  A0000-BFFFF uncachable
  C0000-C7FFF write-protect
  C8000-FFFFF uncachable
MTRR variable ranges enabled:
  0 base 0000000000 mask FFC0000000 write-back
  1 disabled
  2 disabled
  3 disabled
  4 disabled
  5 disabled
  6 disabled
  7 disabled
x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
  get_mtrr: cpu0 reg00 base=0000000000 size=0000040000 write-back
e820 update range: 0000000000001000 - 0000000000010000 (usable) ==> (reserved)
Scanning 1 areas for low memory corruption
modified physical RAM map:
 modified: 0000000000000000 - 0000000000001000 (usable)
 modified: 0000000000001000 - 0000000000010000 (reserved)
 modified: 0000000000010000 - 000000000009f800 (usable)
 modified: 000000000009f800 - 00000000000a0000 (reserved)
 modified: 00000000000f0000 - 0000000000100000 (reserved)
 modified: 0000000000100000 - 000000003fff0000 (usable)
 modified: 000000003fff0000 - 000000003fff3000 (ACPI NVS)
 modified: 000000003fff3000 - 0000000040000000 (ACPI data)
 modified: 00000000e0000000 - 00000000f0000000 (reserved)
 modified: 00000000fec00000 - 0000000100000000 (reserved)
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
Rebooting in 1 seconds..BUG: Int 14: CR2 f0010057
     EDI c0b083e0  ESI (null)  EBP c0cdbdb0  ESP c0cdbd78
     EBX 0000006c  EDX 0000000e  ECX f000ff53  EAX 00000001
     err 00000002  EIP c014a0da   CS 00000060  flg 00010086
Stack: c0cdbffc c0cdbff8 c0cdb000 c0cdb000 (null) c0cdbdcc c0cdbdcc 00000046
       (null) (null) c0cdbde0 c014a805 (null) 00000001 00000001 (null)
       c0749e9b 0000006c c03609ec 0000005c 0000006c (null) c0cdbe00 c077733b
Pid: 0, comm: swapper Not tainted 2.6.29-rc8-tip-02516-g83219b0-dirty #35476
Call Trace:
 [<c0cdc28a>] hlt_loop+0x0/0xe
 [<c014a0da>] ? __lock_acquire+0x4a/0x6f0
 [<c014a805>] lock_acquire+0x85/0x100
 [<c0749e9b>] ? klist_next+0x1b/0xb0
 [<c03609ec>] ? vsnprintf+0x6c/0x430
 [<c077733b>] _spin_lock+0x3b/0x70
 [<c0749e9b>] ? klist_next+0x1b/0xb0
 [<c0749e9b>] klist_next+0x1b/0xb0
 [<c040087d>] next_device+0xd/0x20
 [<c04008cd>] bus_find_device+0x3d/0x70
 [<c037af81>] no_pci_devices+0x21/0x40
 [<c037a4b0>] ? find_anything+0x0/0x10
 [<c03802f0>] pci_get_subsys+0x20/0x80
 [<c0380370>] pci_get_device+0x20/0x30
 [<c0117180>] mach_reboot_fixups+0x40/0x60
 [<c0113c68>] native_machine_emergency_restart+0x88/0x1d0
 [<c01138e3>] __machine_emergency_restart+0x13/0x20
 [<c0113962>] machine_emergency_restart+0x12/0x20
 [<c0136c4d>] emergency_restart+0xd/0x10
 [<c0128c05>] panic+0xd5/0x100
 [<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�

View attachment "config" of type "text/plain" (63439 bytes)