2.5.27 raid1 bug...

DISCUSSION Roe Peterson 2 participants 2 messages Jul 22, 2002

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Roe Peterson

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2002-07-22 18:22 UTC #0 lore raw

Okay, I've isolated a problem with raid1/md under 2.5.27...

Scenario:

/dev/hda2 and /dev/hdb2 are unused partitions.

/etc/raidtab:
raiddev /dev/md0
raid-level 1
nr-raid-disks 2
chunk-size 64k
persistent-superblock 1
nr-spare-disks 0
device /dev/hda2
raid-disk 0
device /dev/hdb2
raid-disk 1

mkraid /dev/md0

Fails with a kernel panic. A bit of searching finds that this chunk of code (md.c, about line 850):

     rdev = list_entry(&mddev->disks.next, mdk_rdev_t, same_set);
     sb = rdev->sb;

     memset(sb, 0, sizeof(*sb));

Is failing. sb is == 1 !!

Anyone got any ideas?

Neil Brown

2002-07-22 21:19 UTC #1 lore raw

Quoted 19 lines · On Monday July 22, [email protected] wrote:

Okay, I've isolated a problem with raid1/md under 2.5.27...
Scenario:
/dev/hda2 and /dev/hdb2 are unused partitions.
/etc/raidtab:
raiddev /dev/md0
raid-level 1
nr-raid-disks 2
chunk-size 64k
persistent-superblock 1
nr-spare-disks 0
device /dev/hda2
raid-disk 0
device /dev/hdb2
raid-disk 1

Quoted 5 lines

mkraid /dev/md0
Fails with a kernel panic. A bit of searching finds that this chunk of code (md.c, about line 850):
     rdev = list_entry(&mddev->disks.next, mdk_rdev_t, same_set);

Quoted 7 lines

     sb = rdev->sb;

     memset(sb, 0, sizeof(*sb));
Is failing. sb is == 1 !!
Anyone got any ideas?

Yep, that '&' is wrong. Remove and it will work.

NeilBrown