Bug#597563: grub-common: grub-probe segfaults scanning lvm devices

[Vladimir 'φ-coder/phcoder' Serbinenko]

As was recommended I forward the remaining part to linux-raid mailing list.
In short: on his system mdraid, raid5, 4 devices, metadata (presumably)
0.90, two devices have index 0.
If such situation is valid please advice me on how such situation should
be handled.
@Matthew: could you supply mdadm -Q outputput and *last* 64K of every disk?
On 01/08/2011 05:08 AM, Matthew Gabeler-Lee wrote:
> On Fri, 7 Jan 2011, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
>
>> I believe it to be a problem with raid5. Could you try the latest
>> upstream? If problem persists I would need following dumps:
>> dd if=/dev/sd[abcd]3 of=[abcd].img bs=1024 count=64
>> dd if=/dev/md2 of=2.img bs=1024 count=64
>> grub-fstest -c 4 /dev/sda3 /dev/sdb3 /dev/sdc3 /dev/sdd3 hex -l
>> '(md2)+128' > g2.img
>
> OK, built grub from latest bzr trunk.
>
> From my past workarounds, I effectively have a list of all the
> invocations of grub-probe that grub-install/grub-setup runs on my
> system.  Most of those work fine now.  The only thing that isn't fine
> is that most invocations spit out a message "error: found two disks
> with the number 0" but give a correct answer and exit successfully.
>
> If I run grub-probe with enough --verbose arguments, then that message
> gets this context:
>
> grub-core/disk/raid.c:699: Scanning for RAID devices on disk hd2
> grub-core/kern/disk.c:245: Opening `hd2'...
> ./grub-probe: info: the size of hd2 is 1465149168.
> error: found two disks with the number 0.
> grub-core/kern/disk.c:330: Closing `hd2'.
>
> So, it seems maybe you're right that there's something funky with the
> raid5.  The outputs you requested are attached.  The grub-fstest
> invocation complained that -l is not a valid option, I hope the output
> without it is still what you want / need.  I included the full output
> of one of the complaining grub-probe invocations too, on the guess
> that it might be helpful.
>
> FWIW, the raid5 array in question has had every disk swapped at least
> once in its life span, including from growing from 3 to 4 disks, and
> from smaller to larger disks, not to mention one or two disk failures
> along the way.
>


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko


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