mdadm segfault when assembling the array

mdadm segfault when assembling the array

[Tomasz Chmielewski]

My development machine crashed (a couple of times - X ati driver does 
not seem to like multiple graphics cards), and I lost one of the md 
RAID-1 arrays (other arrays work just fine):

# mdadm -V
mdadm - v3.0.2 - 25th September 2009

# mdadm /dev/md2 -A /dev/sda5 /dev/sdb5
Segmentation fault

# dmesg
[ 4736.407237] md: md2 stopped.
[ 4736.568062] mdadm[10019]: segfault at 0 ip 00007fc7172ed711 sp 
00007fff9b486af8 error 4 in libc-2.10.1.so[7fc717274000+154000]

The kernel is 2.6.31.1.

Any hints before I try to fix it my way?



-- 
Tomasz Chmielewski
http://wpkg.org

Re: mdadm segfault when assembling the array

[Tomasz Chmielewski]

Majed B. schrieb:
> If you're not using the latest version of mdadm, grab it, compile it, 
> install it and try. I faced the same problem because I was using an 
> older version.

AFAIK mdadm 3.0.2 is the latest-greatest (stable) release:

http://www.kernel.org/pub/linux/utils/raid/mdadm/


-- 
Tomasz Chmielewski
http://wpkg.org

Re: mdadm segfault when assembling the array

[Majed B.]

My bad. I haven't noticed that you were using 3.0.2

Try to force the assembly of the array -Af and see if it works. If
that doesn't work, run it again using strace (strace mdadm ...) and
that should give much more detail into why this is happening.

On Wed, Oct 7, 2009 at 11:48 AM, Tomasz Chmielewski <mangoo@wpkg.org> wrote:
>
> Majed B. schrieb:
>>
>> If you're not using the latest version of mdadm, grab it, compile it, install it and try. I faced the same problem because I was using an older version.
>
> AFAIK mdadm 3.0.2 is the latest-greatest (stable) release:
>
> http://www.kernel.org/pub/linux/utils/raid/mdadm/
>
>
> --
> Tomasz Chmielewski
> http://wpkg.org



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Re: mdadm segfault when assembling the array

[Tomasz Chmielewski]

Majed B. schrieb:
> My bad. I haven't noticed that you were using 3.0.2
> 
> Try to force the assembly of the array -Af and see if it works. If
> that doesn't work, run it again using strace (strace mdadm ...) and
> that should give much more detail into why this is happening.

I don't see anything particular in the strace:

http://www1.wpkg.org/mdadm.txt

(here, adding only one drive, as I had to mount the other drive without 
md to access data).


-- 
Tomasz Chmielewski
http://wpkg.org

Re: mdadm segfault when assembling the array

[Beolach]

On Wed, Oct 7, 2009 at 02:33, Tomasz Chmielewski <mangoo@wpkg.org> wrote:
> My development machine crashed (a couple of times - X ati driver does not
> seem to like multiple graphics cards), and I lost one of the md RAID-1
> arrays (other arrays work just fine):
>
> # mdadm -V
> mdadm - v3.0.2 - 25th September 2009
>
> # mdadm /dev/md2 -A /dev/sda5 /dev/sdb5
> Segmentation fault
>
> # dmesg
> [ 4736.407237] md: md2 stopped.
> [ 4736.568062] mdadm[10019]: segfault at 0 ip 00007fc7172ed711 sp
> 00007fff9b486af8 error 4 in libc-2.10.1.so[7fc717274000+154000]
>
> The kernel is 2.6.31.1.
>
> Any hints before I try to fix it my way?
>

How did you install mdadm?  I think I remember similar issues w/
segfaults when I
compiled w/ MAKEOPTS=-jN where N>1.  What distro & architecture were you on?


Good luck,
Conway S. Smith

Re: mdadm segfault when assembling the array

[Tomasz Chmielewski]

Beolach schrieb:
> On Wed, Oct 7, 2009 at 02:33, Tomasz Chmielewski <mangoo@wpkg.org> wrote:

>> The kernel is 2.6.31.1.
>>
>> Any hints before I try to fix it my way?
>>
> 
> How did you install mdadm?  I think I remember similar issues w/
> segfaults when I
> compiled w/ MAKEOPTS=-jN where N>1.  What distro & architecture were you on?

I'm using a distribution package (Mandriva Cooker, 64 bit). It was 
working fine all the time; started to break with yesterday's crashes (I 
see my /boot array is not available as well).

However, I just compiled mdadm from source (without changing any options 
in the Makefile), and it crashes too.


-- 
Tomasz Chmielewski
http://wpkg.org

Re: mdadm segfault when assembling the array

[Tomasz Chmielewski]

Tomasz Chmielewski schrieb:
> Beolach schrieb:
>> On Wed, Oct 7, 2009 at 02:33, Tomasz Chmielewski <mangoo@wpkg.org> wrote:
> 
>>> The kernel is 2.6.31.1.
>>>
>>> Any hints before I try to fix it my way?
>>>
>>
>> How did you install mdadm?  I think I remember similar issues w/
>> segfaults when I
>> compiled w/ MAKEOPTS=-jN where N>1.  What distro & architecture were 
>> you on?

Well, mdadm just doesn't work on my machine - tried 3.0.1, 3.0.2:

# ./mdadm /dev/md3 -C /dev/sdb6 missing -n 2 -l 1
Segmentation fault
#

Latest git seems to work fine though.


-- 
Tomasz Chmielewski
http://wpkg.org

Re: mdadm segfault when assembling the array

[Luca Berra]

On Wed, Oct 07, 2009 at 11:13:26AM +0200, Tomasz Chmielewski wrote:
> Beolach schrieb:
>> On Wed, Oct 7, 2009 at 02:33, Tomasz Chmielewski <mangoo@wpkg.org> wrote:
>
>>> The kernel is 2.6.31.1.
>>>
>>> Any hints before I try to fix it my way?
>>>
>>
>> How did you install mdadm?  I think I remember similar issues w/
>> segfaults when I
>> compiled w/ MAKEOPTS=-jN where N>1.  What distro & architecture were you on?
>
> I'm using a distribution package (Mandriva Cooker, 64 bit). It was working 
> fine all the time; started to break with yesterday's crashes (I see my 
> /boot array is not available as well).
could you run it under gdb and post a backtrace?

L.

-- 
Luca Berra -- bluca@comedia.it
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Re: mdadm segfault when assembling the array

[Tomasz Chmielewski]

Luca Berra schrieb:
> On Wed, Oct 07, 2009 at 11:13:26AM +0200, Tomasz Chmielewski wrote:
>> Beolach schrieb:
>>> On Wed, Oct 7, 2009 at 02:33, Tomasz Chmielewski <mangoo@wpkg.org> 
>>> wrote:
>>
>>>> The kernel is 2.6.31.1.
>>>>
>>>> Any hints before I try to fix it my way?
>>>>
>>>
>>> How did you install mdadm?  I think I remember similar issues w/
>>> segfaults when I
>>> compiled w/ MAKEOPTS=-jN where N>1.  What distro & architecture were 
>>> you on?
>>
>> I'm using a distribution package (Mandriva Cooker, 64 bit). It was 
>> working fine all the time; started to break with yesterday's crashes 
>> (I see my /boot array is not available as well).
> could you run it under gdb and post a backtrace?

As I said, it's fixed in the latest mdadm git tree.


-- 
Tomasz Chmielewski
http://wpkg.org