[mmotm] Backtrace __change_page_attr_set_clr

[mmotm] Backtrace __change_page_attr_set_clr

[Balbir Singh]

Hi, Andrew,

I see the following backtrace with 2009-01-16-16-18

------------[ cut here ]------------
WARNING: at arch/x86/mm/pageattr.c:560
__change_page_attr_set_clr+0xdc/0x891()
...
CPA: called for zero pte. vaddr = ffff8800cfee2000 cpa->vaddr =
ffff8800cfee2000
Modules linked in: coretemp hwmon kvm_intel kvm rtc_cmos rtc_core
rtc_lib mptsas mptscsih mptbase scsi_transport_sas
Pid: 3486, comm: dmidecode Not tainted 2.6.29-rc1 #2
Call Trace:
 [<ffffffff8023e9da>] warn_slowpath+0xd8/0xf5
 [<ffffffff8024f00b>] __kernel_text_address+0x1a/0x26
 [<ffffffff8020f307>] print_context_stack+0x90/0xa6
 [<ffffffff8025cc63>] find_usage_backwards+0xe/0xfc
 [<ffffffff8025f500>] __lock_acquire+0x763/0x7ce
 [<ffffffff80227237>] __change_page_attr_set_clr+0x5b/0x891
 [<ffffffff80227237>] __change_page_attr_set_clr+0x5b/0x891
 [<ffffffff802272b8>] __change_page_attr_set_clr+0xdc/0x891
 [<ffffffff802a2a5c>] __purge_vmap_area_lazy+0x195/0x1a2
 [<ffffffff802a2912>] __purge_vmap_area_lazy+0x4b/0x1a2
 [<ffffffff802a3b49>] vm_unmap_aliases+0x1b9/0x1c8
 [<ffffffff802a39cd>] vm_unmap_aliases+0x3d/0x1c8
 [<ffffffff80227bac>] change_page_attr_set_clr+0x13f/0x2f1
 [<ffffffff80597355>] _spin_unlock+0x17/0x20
 [<ffffffff80227e56>] _set_memory_wb+0x1d/0x20
 [<ffffffff80229189>] reserve_pfn_range+0x1a1/0x23a
 [<ffffffff8029ab59>] remap_pfn_range+0x90/0x33a
 [<ffffffff802294a2>] phys_mem_access_prot_allowed+0x98/0x1b9
 [<ffffffff802b0e3f>] kmem_cache_alloc+0x94/0xbc
 [<ffffffff803d8d48>] mmap_mem+0x6c/0x91
 [<ffffffff8029ee18>] mmap_region+0x262/0x4a9
 [<ffffffff8029f5c4>] do_mmap_pgoff+0x2a6/0x30d
 [<ffffffff8020fa95>] sys_mmap+0x8b/0x110
 [<ffffffff8020bedb>] system_call_fastpath+0x16/0x1b
---[ end trace 21993f860dedca28 ]---
dmidecode:3486 reserve_pfn_range ioremap_change_attr failed write-back
for cfee2000-cfee3000
dmidecode:3486 freeing invalid memtype cfee2000-cfee3000

I am yet to fully investigate the problem, but did not want to hold of
reporting it.

-- 
	Balbir

Re: [mmotm] Backtrace __change_page_attr_set_clr

[Andrew Morton]

On Tue, 27 Jan 2009 16:38:23 +0530 Balbir Singh <balbir@linux.vnet.ibm.com> wrote:

> Hi, Andrew,
> 
> I see the following backtrace with 2009-01-16-16-18
> 
> ------------[ cut here ]------------
> WARNING: at arch/x86/mm/pageattr.c:560
> __change_page_attr_set_clr+0xdc/0x891()
> ...
> CPA: called for zero pte. vaddr = ffff8800cfee2000 cpa->vaddr =
> ffff8800cfee2000
> Modules linked in: coretemp hwmon kvm_intel kvm rtc_cmos rtc_core
> rtc_lib mptsas mptscsih mptbase scsi_transport_sas
> Pid: 3486, comm: dmidecode Not tainted 2.6.29-rc1 #2
> Call Trace:
>  [<ffffffff8023e9da>] warn_slowpath+0xd8/0xf5
>  [<ffffffff8024f00b>] __kernel_text_address+0x1a/0x26
>  [<ffffffff8020f307>] print_context_stack+0x90/0xa6
>  [<ffffffff8025cc63>] find_usage_backwards+0xe/0xfc
>  [<ffffffff8025f500>] __lock_acquire+0x763/0x7ce
>  [<ffffffff80227237>] __change_page_attr_set_clr+0x5b/0x891
>  [<ffffffff80227237>] __change_page_attr_set_clr+0x5b/0x891
>  [<ffffffff802272b8>] __change_page_attr_set_clr+0xdc/0x891
>  [<ffffffff802a2a5c>] __purge_vmap_area_lazy+0x195/0x1a2
>  [<ffffffff802a2912>] __purge_vmap_area_lazy+0x4b/0x1a2
>  [<ffffffff802a3b49>] vm_unmap_aliases+0x1b9/0x1c8
>  [<ffffffff802a39cd>] vm_unmap_aliases+0x3d/0x1c8
>  [<ffffffff80227bac>] change_page_attr_set_clr+0x13f/0x2f1
>  [<ffffffff80597355>] _spin_unlock+0x17/0x20
>  [<ffffffff80227e56>] _set_memory_wb+0x1d/0x20
>  [<ffffffff80229189>] reserve_pfn_range+0x1a1/0x23a
>  [<ffffffff8029ab59>] remap_pfn_range+0x90/0x33a
>  [<ffffffff802294a2>] phys_mem_access_prot_allowed+0x98/0x1b9
>  [<ffffffff802b0e3f>] kmem_cache_alloc+0x94/0xbc
>  [<ffffffff803d8d48>] mmap_mem+0x6c/0x91
>  [<ffffffff8029ee18>] mmap_region+0x262/0x4a9
>  [<ffffffff8029f5c4>] do_mmap_pgoff+0x2a6/0x30d
>  [<ffffffff8020fa95>] sys_mmap+0x8b/0x110
>  [<ffffffff8020bedb>] system_call_fastpath+0x16/0x1b
> ---[ end trace 21993f860dedca28 ]---
> dmidecode:3486 reserve_pfn_range ioremap_change_attr failed write-back
> for cfee2000-cfee3000
> dmidecode:3486 freeing invalid memtype cfee2000-cfee3000
> 
> I am yet to fully investigate the problem, but did not want to hold of
> reporting it.

OK, thanks.  It looks like you cc'ed the right person ;)

The code in current linux-next has changed a bit since 16 Jan. 
Hopefully this warning from dmidecode got fixed.

I'm still quite backlogged from the week overseas, and I've been
reluctant to do another mmotm because it would probably be an
uncompileable pile of junk.

Re: [mmotm] Backtrace __change_page_attr_set_clr

[Balbir Singh]

* Andrew Morton <akpm@linux-foundation.org> [2009-01-27 08:37:05]:

> On Tue, 27 Jan 2009 16:38:23 +0530 Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
> 
> OK, thanks.  It looks like you cc'ed the right person ;)
> 
> The code in current linux-next has changed a bit since 16 Jan. 
> Hopefully this warning from dmidecode got fixed.
>

I'll test linux-next or -tip and see the status of the issue
 
> I'm still quite backlogged from the week overseas, and I've been
> reluctant to do another mmotm because it would probably be an
> uncompileable pile of junk.

That explains it all, with LCA it was expected :) I am still trying to
get used to 2009.

-- 
	Balbir

Re: [mmotm] Backtrace __change_page_attr_set_clr

[Suresh Siddha]

On Tue, 2009-01-27 at 08:37 -0800, Andrew Morton wrote:
> On Tue, 27 Jan 2009 16:38:23 +0530 Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
> 
> > Hi, Andrew,
> > 
> > I see the following backtrace with 2009-01-16-16-18
> > 
> > ------------[ cut here ]------------
> > WARNING: at arch/x86/mm/pageattr.c:560
> > __change_page_attr_set_clr+0xdc/0x891()
> > ...
> > CPA: called for zero pte. vaddr = ffff8800cfee2000 cpa->vaddr =
> > ffff8800cfee2000
> OK, thanks.  It looks like you cc'ed the right person ;)
> 
> The code in current linux-next has changed a bit since 16 Jan. 
> Hopefully this warning from dmidecode got fixed.

This is fixed recently. In linus's git, commit
a1e46212a410793d575718818e81ddc442a65283

thanks,
suresh