[arch-general] Bad LUN and bad target number messages during boot

[Lorenzo Bandieri]

Hello archers,

I'm running Arch Linux on an Acer Aspire One D257 [1]. Since last
month, I've notices these messages showing up during the boot process:

(from dmesg | less)

[    6.714686] Bad LUN (0:1)
[    6.715042] Bad target number (1:0)
[    6.715437] sd 4:0:0:0: [sdb] Attached SCSI removable disk #I
usally don't see this one
[    6.715733] Bad target number (2:0)
[    6.716020] Bad target number (3:0)
[    6.716308] Bad target number (4:0)
[    6.716594] Bad target number (5:0)
[    6.716937] Bad target number (6:0)
[    6.717225] Bad target number (7:0)

Just before the aforementioned messages, I see also:
(this time from less /var/log/everything.log )
[    5.730996] acer_wmi: No or unsupported WMI interface, unable to load

I don't know if these messages are connected (I don't think so)

Apparently, this doesn't lead to further problems. My google searches
did not return anything useful, except that others experienced similar
messages; there is even one thread in the Arch Forum [2], but didn't
get much attention. As far as I can see, there are no bug reports or
documentation concerning messages like these. It seems something
regarding SD card reader...

Now, I'm wondering:
- Is it a known problem?
- What do these messages mean?
- Can it cause problems or harm my hardware? Should I be worried?
- Should I fill a bug report...?

Now, some output:

# ls /sys/block/
sda  sdb

# cat /proc/partitions

major minor  #blocks  name

   8        0  244198584 sda
   8        1     104391 sda1
   8        2    2048287 sda2
   8        3   51207187 sda3
   8        4  190836135 sda4

# fdisk -l

Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00097750

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *          63      208844      104391   83  Linux
/dev/sda2          208845     4305419     2048287+  82  Linux swap / Solaris
/dev/sda3         4305420   106719794    51207187+  83  Linux
/dev/sda4       106719795   488392064   190836135   83  Linux

# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: ATA      Model: Hitachi HTS54322 Rev: ESBO
  Type:   Direct-Access                    ANSI  SCSI revision: 05
Host: scsi4 Channel: 00 Id: 00 Lun: 00
  Vendor: Generic- Model: xD/SD/M.S.       Rev: 1.00
  Type:   Direct-Access                    ANSI  SCSI revision: 02


#cat /etc/fstab

#
# /etc/fstab: static file system information
#
# <file system> <dir>   <type>  <options>       <dump>  <pass>
tmpfs           /tmp    tmpfs   nodev,nosuid    0       0
UUID=0d3cf67e-565e-495c-bac8-66dfd290b882 /boot ext2 defaults 0 1
UUID=21b920dc-54a0-43a5-9e37-e7c7e85e4cba /home ext4
defaults,noatime,nodiratime 0 1
UUID=5d8f2ea7-de29-4972-a127-0ea2363d65fd swap swap defaults 0 0
UUID=784fbd71-712f-4b1f-9ea7-f2c681cdbbda / ext4 defaults,noatime,nodiratime 0 1



[1] http://us.acer.com/ac/en/US/content/model/LU.SFS0D.002
[2] https://bbs.archlinux.org/viewtopic.php?id=124139

Thanks to everyone.

Best regards,

Lorenzo