Re: Bug#597563: grub-common: grub-probe segfaults scanning lvmdevices

On Sat, 8 Jan 2011 17:53:07 -0500 (EST) Matthew Gabeler-Lee
wrote:

> On Sat, 8 Jan 2011, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
>=20
> > As was recommended I forward the remaining part to linux-raid maili=
ng list.
> > In short: on his system mdraid, raid5, 4 devices, metadata (presuma=
bly)
> > 0.90, two devices have index 0.

What do you mean by "two devices have index 0" ??? I could see nothing =
in any
of the posts you sent that could be interpreted that way.

NeilBrown

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

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On 01/09/2011 09:55 PM, NeilBrown wrote:
> On Sat, 8 Jan 2011 17:53:07 -0500 (EST) Matthew Gabeler-Lee
> wrote:
>
> =20
>> On Sat, 8 Jan 2011, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
>>
>> =20
>>> As was recommended I forward the remaining part to linux-raid mailing=
list.
>>> In short: on his system mdraid, raid5, 4 devices, metadata (presumabl=
y)
>>> 0.90, two devices have index 0.
>>> =20
> What do you mean by "two devices have index 0" ??? I could see nothing =
in any
> of the posts you sent that could be interpreted that way.
>
> =20
Sorry, I forgot this part:
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'.

Trouble comes from followint part:
$ sudo mdadm --examine /dev/sdb
/dev/sdb:
Magic : a92b4efc
Version : 0.90.03
UUID : 9364f7a2:d74695d5:7d8db3a0:3b5f9e48
Creation Time : Mon Mar 27 14:03:04 2006
Raid Level : raid1
Used Dev Size : 979840 (957.04 MiB 1003.36 MB)
Array Size : 979840 (957.04 MiB 1003.36 MB)
Raid Devices : 2
Total Devices : 3
Preferred Minor : 0

Update Time : Thu Jan 8 00:34:39 2009
State : clean
Active Devices : 2
Working Devices : 3
Failed Devices : 0
Spare Devices : 1
Checksum : 5b8134eb - correct
Events : 9446738
So sdb as whole pretends to be a part of the following array:
$ sudo mdadm -QD /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Mon Mar 27 14:03:04 2006
Raid Level : raid1
Array Size : 2008000 (1961.27 MiB 2056.19 MB)
Used Dev Size : 2008000 (1961.27 MiB 2056.19 MB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Sat Jan 8 18:35:47 2011
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0

UUID : 9364f7a2:d74695d5:7d8db3a0:3b5f9e48
Events : 0.10758124

Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
2 8 1 2 active sync /dev/sda1
3 8 49 3 active sync /dev/sdd1


As you can see there is a stalled superblock approximately 2 years old.
I don't know if it's some kind of freak accident or operator error. If
it's later then probably zero-filling over stalled superblock will solve
the problems

--=20
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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