Re: Kernel BUG at fs/sysfs/symlink.c:87 happens with 2.6.15 too

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wednesday January 11, [email protected] wrote:
> Sander wrote (ao):
> # I'll try plain 2.6.15 now.
> 
> The same thing happens. I try to create a raid1 over nine disks (eight
> on Promise SX8):
> 
> mdadm -C -l1 -n9 /dev/md0 /dev/sda1 /dev/sx8/0p1 /dev/sx8/1p1 /dev/sx8/2p1 /dev/sx8/3p1 /dev/sx8/4p1 /dev/sx8/5p1 /dev/sx8/6p1 /dev/sx8/7p1
> 
> It Segfaults and gives this:
> 
> Difference with 2.6.15-mm2 is that 2.6.15 keeps on running.
> 
> I'll enable some debug options now. Any advice on what I can try besides
> this? Am I doing something wrong?

No, you aren't doing anything wrong.

It appears that the 'kobject_add' call in bind_rdev_to_array is not
setting the ->dentry field for the kobject.
i.e. it is failing to create
   /sys/block/md0/md/dev-XXXX

where 'XXXX' is the internal name for the component device, as
returned by 'bdevname'.  The most likely reason I can think of for
this is that the name is already in use. i.e. different sx devices get
the same name.... let's see....

Close, but not quite.
sx8 creates device names with a '/' in them as we can see from:
> 
> [ 2281.547827] md: bind<sda1>
> [ 2281.547877] md: bind<sx8/0p1>
                             ^

That's unfortunate.  We will have to remove them.
You will find that the names in /sys/block look like
    /sys/block/sx8!0

The following patch should achieve the same substitution for
md.

NeilBrown

--------------------------
Remove slashed from disk names when creation dev names in sysfs

e.g. The sx8 driver uses names like sx8/0.
This would make a md component dev name like
   /sys/block/md0/md/dev-sx8/0
which is no allowed.  So we change the '/' to '!' just like
fs/partitions/check.c(register_disk) does.

Signed-off-by: Neil Brown <[email protected]>

### Diffstat output
 ./drivers/md/md.c |    3 +++
 1 file changed, 3 insertions(+)

diff ./drivers/md/md.c~current~ ./drivers/md/md.c
--- ./drivers/md/md.c~current~	2006-01-12 09:43:11.000000000 +1100
+++ ./drivers/md/md.c	2006-01-12 09:44:39.000000000 +1100
@@ -1238,6 +1238,7 @@ static int bind_rdev_to_array(mdk_rdev_t
 	mdk_rdev_t *same_pdev;
 	char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
 	struct kobject *ko;
+	char *s;
 
 	if (rdev->mddev) {
 		MD_BUG();
@@ -1277,6 +1278,8 @@ static int bind_rdev_to_array(mdk_rdev_t
 	bdevname(rdev->bdev,b);
 	if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
 		return -ENOMEM;
+	while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
+		*s = '!';
 			
 	list_add(&rdev->same_set, &mddev->disks);
 	rdev->mddev = mddev;
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux