Re: Kernel panic when scrub is used

2013-02-20 Thread Jérôme Poulin 
On Wed, Feb 20, 2013 at 1:42 PM, Jérôme Poulin  wrote:
> On Wed, Feb 20, 2013 at 8:11 AM, David Sterba  wrote:
>> Was the filesystem created with nodesize > 4k ?
>
> Yes; 64KB.

I just noticed I didn't mention that I have raid5/6 code merged in but
it never was used on the partition I scrubbed.
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Re: Kernel panic when scrub is used

2013-02-20 Thread David Sterba 
On Mon, Feb 18, 2013 at 12:53:28PM -0500, Jérôme Poulin wrote:
> http://tinypic.com/r/2r3xdvl/6

At the top of the listing there's apparent trace of a WARN_ON issued and
it's in read_extent_buffer

4660 void read_extent_buffer(struct extent_buffer *eb, void *dstv,
4661 unsigned long start,
4662 unsigned long len)
4663 {
4664 size_t cur;
4665 size_t offset;
4666 struct page *page;
4667 char *kaddr;
4668 char *dst = (char *)dstv;
4669 size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1);
4670 unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT;
4671
4672 WARN_ON(start > eb->len);
4673 WARN_ON(start + len > eb->start + eb->len);

4674
4675 offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE 
- 1);
4676
4677 while (len > 0) {
4678 page = extent_buffer_page(eb, i);
4679
4680 cur = min(len, (PAGE_CACHE_SIZE - offset));
4681 kaddr = page_address(page);
4682 memcpy(dst, kaddr + offset, cur);

first segfault happens at memcpy, it's likely a bad value in 'offset'
calculated from bogus values in 'eb'. With some luck we can guess at which page
it happend (which of RBX=11, RCX=2, RDX=1 holds value of 'i') or what are
values of other variables.

4683
4684 dst += cur;
4685 len -= cur;
4686 offset = 0;
4687 i++;
4688 }
4689 }

Was the filesystem created with nodesize > 4k ?

david
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Re: Kernel panic when scrub is used

2013-02-18 Thread Arne Jansen 
On 02/18/13 18:53, Jérôme Poulin wrote:
> Here you go, I also added 2 other screenshots of the same problem.
> http://tinypic.com/r/5ckgug/6
> http://tinypic.com/r/t0i9t4/6
> http://tinypic.com/r/2r3xdvl/6

do you have any idea how I can reproduce it here?

-Arne

> 
> On Mon, Feb 18, 2013 at 12:37 PM, Arne Jansen  wrote:
>> On 02/18/13 18:14, Jérôme Poulin wrote:
>>> I experience a kernel panic with "General protection fault" when doing
>>> a scrub on Kernel 3.8-rc7.
>>>
>>> Here is a screenshot: http://tinypic.com/r/34r6nad/6
>>
>> I'd love to see the first stacktrace...
>>
>>>
>>> The weird part is that the scrub completes from initramfs, but when
>>> system is fully booted, is kernel panics every time in the low
>>> percentage. (<10%)
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>>>
>>

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Re: Kernel panic when scrub is used

2013-02-18 Thread Jérôme Poulin 
Here you go, I also added 2 other screenshots of the same problem.
http://tinypic.com/r/5ckgug/6
http://tinypic.com/r/t0i9t4/6
http://tinypic.com/r/2r3xdvl/6

On Mon, Feb 18, 2013 at 12:37 PM, Arne Jansen  wrote:
> On 02/18/13 18:14, Jérôme Poulin wrote:
>> I experience a kernel panic with "General protection fault" when doing
>> a scrub on Kernel 3.8-rc7.
>>
>> Here is a screenshot: http://tinypic.com/r/34r6nad/6
>
> I'd love to see the first stacktrace...
>
>>
>> The weird part is that the scrub completes from initramfs, but when
>> system is fully booted, is kernel panics every time in the low
>> percentage. (<10%)
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
>> the body of a message to majord...@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
>
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Re: Kernel panic when scrub is used

2013-02-18 Thread Arne Jansen 
On 02/18/13 18:14, Jérôme Poulin wrote:
> I experience a kernel panic with "General protection fault" when doing
> a scrub on Kernel 3.8-rc7.
> 
> Here is a screenshot: http://tinypic.com/r/34r6nad/6

I'd love to see the first stacktrace...

> 
> The weird part is that the scrub completes from initramfs, but when
> system is fully booted, is kernel panics every time in the low
> percentage. (<10%)
> --
> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
> the body of a message to majord...@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

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