[Bug 1488688] Re: partprobe fails on /dev/mapper/353333330000007d0

[ChristianEhrhardt]

Hi,
thanks for the nice setup with scsi_debug that helps.
I also ran it against some real FCP devices I had around.

I can confirm that this still applies to Xenial.
1. working without issue on the device itself e.g. /dev/sd*
2. when using on /dev/mapper devices reporting issues

ubuntu at s1lp5:~$ sudo partprobe /dev/mapper/36005076306ffd6b6000000000000240
36005076306ffd6b60000000000002402        36005076306ffd6b60000000000002402-part2  36005076306ffd6b60000000000002403        
ubuntu at s1lp5:~$ sudo /sbin/sgdisk --new=2:0:100M --change-name=2:'ceph journal' --partition-guid=2:a94ad65f-fadb-4178-851b-5261c06ee3b9 --typecode=2:45b0969e-8ae0-4982-bf9d-5a8d867af560 --mbrtogpt -- /dev/mapper/36005076306ffd6b60000000000002403
Creating new GPT entries.
Setting name!
partNum is 1
REALLY setting name!
Warning: The kernel is still using the old partition table.
The new table will be used at the next reboot or after you
run partprobe(8) or kpartx(8)
The operation has completed successfully.
ubuntu at s1lp5:~$ sudo partprobe /dev/mapper/36005076306ffd6b60000000000002403
device-mapper: create ioctl on 36005076306ffd6b60000000000002403p2part2-mpath-36005076306ffd6b60000000000002403 failed: Device or resource busy
ubuntu at s1lp5:~$ echo $?
0
ubuntu at s1lp5:~$ ll /dev/mapper/36005076306ffd6b60000000000002403*
lrwxrwxrwx 1 root root 7 Apr 20 10:53 /dev/mapper/36005076306ffd6b60000000000002403 -> ../dm-1
lrwxrwxrwx 1 root root 7 Apr 20 10:53 /dev/mapper/36005076306ffd6b60000000000002403-part2 -> ../dm-3


But then as you have shown as well, it is just a message about the ioctl that likely isn't handled/forwarded correctly by the device mapper.

It doesn't even have a bad return code - so it might just be about
making more clear that this is a warning, but not an error at all right?

** Changed in: multipath-tools (Ubuntu)
       Status: New => Triaged

** Changed in: multipath-tools (Ubuntu)
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/1488688

Title:
  partprobe fails on /dev/mapper/353333330000007d0

Status in multipath-tools package in Ubuntu:
  Triaged

Bug description:
  Steps to reproduce on Ubuntu 14.04 on a virtual machine with no
  /dev/sda device

  # apt-get install linux-image-extra-3.13.0-61-generic
  # modprobe scsi_debug vpd_use_hostno=0 add_host=1 dev_size_mb=200
  # ls -l /dev/mapper
  total 0
  lrwxrwxrwx 1 root root        7 Aug 25 23:00 353333330000007d0 -> ../dm-0
  crw------- 1 root root  10, 236 Aug 25 11:45 control
  # /sbin/sgdisk --new=2:0:100M --change-name=2:'ceph journal' --partition-guid=2:a94ad65f-fadb-4178-851b-5261c06ee3b9 --typecode=2:45b0969e-8ae0-4982-bf9d-5a8d867af560 --mbrtogpt -- /dev/mapper/353333330000007d0
  Warning: The kernel is still using the old partition table.
  The new table will be used at the next reboot.
  The operation has completed successfully.
  # partprobe /dev/mapper/353333330000007d0
  Device /dev/mapper/353333330000007d0p2 not found
  device-mapper: table ioctl on  failed: No such device or address
  Device /dev/mapper/353333330000007d0p2 not found
  device-mapper: table ioctl on  failed: No such device or address
  # ls -l /dev/mapper
  total 0
  lrwxrwxrwx 1 root root        7 Aug 25 23:00 353333330000007d0 -> ../dm-0
  brw-rw---- 1 root disk 252,   2 Aug 25 23:00 353333330000007d0p2
  crw------- 1 root root  10, 236 Aug 25 11:45 control
  # partprobe /dev/mapper/353333330000007d0
  # ls -l /dev/mapper
  total 0
  lrwxrwxrwx 1 root root        7 Aug 25 23:00 353333330000007d0 -> ../dm-0
  brw-rw---- 1 root disk 252,   1 Aug 25 23:00 353333330000007d0-part2
  brw-rw---- 1 root disk 252,   2 Aug 25 23:00 353333330000007d0p2
  crw------- 1 root root  10, 236 Aug 25 11:45 control

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