[Bug 1874501] Re: vgscan --mknodes creates block device multipath nodes in /dev/mapper

Tue Apr 28 16:42:10 UTC 2020

Note, the whitespace damage in the patch is not needed, just my text
client cleaning up trailing whitespace.

With this patch applied, vgscan --mknodes no longer creates block
devices in /dev/mapper

root at ubuntu:/dev/mapper# ls -al
total 0
drwxr-xr-x  2 root root     120 Apr 28 16:31 .
drwxr-xr-x 17 root root    3800 Apr 28 15:25 ..
crw-------  1 root root 10, 236 Apr 28 15:22 control
lrwxrwxrwx  1 root root       7 Apr 28 16:31 mpatha -> ../dm-0
lrwxrwxrwx  1 root root       7 Apr 28 16:31 mpatha-part1 -> ../dm-1
lrwxrwxrwx  1 root root       7 Apr 28 16:31 mpatha-part2 -> ../dm-2
root at ubuntu:/dev/mapper#
root at ubuntu:/dev/mapper#
root at ubuntu:/dev/mapper# ls -al
total 0
drwxr-xr-x  2 root root     120 Apr 28 16:31 .
drwxr-xr-x 17 root root    3800 Apr 28 15:25 ..
crw-------  1 root root 10, 236 Apr 28 15:22 control
lrwxrwxrwx  1 root root       7 Apr 28 16:31 mpatha -> ../dm-0
lrwxrwxrwx  1 root root       7 Apr 28 16:31 mpatha-part1 -> ../dm-1
lrwxrwxrwx  1 root root       7 Apr 28 16:31 mpatha-part2 -> ../dm-2
root at ubuntu:/dev/mapper# rm -rf mpatha*
root at ubuntu:/dev/mapper# vgscan --mknodes
root at ubuntu:/dev/mapper# ls -al
total 0
drwxr-xr-x  2 root root      60 Apr 28 16:40 .
drwxr-xr-x 17 root root    3800 Apr 28 15:25 ..
crw-------  1 root root 10, 236 Apr 28 15:22 control

The relevant output:

16:40:35.179504 vgscan[55466] toollib.c:2288  No volume groups found.
16:40:35.179806 vgscan[55466] device_mapper/libdm-common.c:2205  WARK: setting a cookie
16:40:35.180137 vgscan[55466] device_mapper/libdm-common.c:2565  Udev cookie 0xd4d8d17 (semid 32786) created
16:40:35.180451 vgscan[55466] device_mapper/libdm-common.c:2585  Udev cookie 0xd4d8d17 (semid 32786) incremented to 1
16:40:35.180762 vgscan[55466] device_mapper/libdm-common.c:2457  Udev cookie 0xd4d8d17 (semid 32786) incremented to 2
16:40:35.181082 vgscan[55466] device_mapper/libdm-common.c:2690  Udev cookie 0xd4d8d17 (semid 32786) assigned to MKNODES task(15) with flags DISABLE_LIBRARY_FALLBACK         (0x20)
16:40:35.181398 vgscan[55466] device_mapper/libdm-common.c:2709  WARK: got my cookie, return 1
16:40:35.181714 vgscan[55466] device_mapper/libdm-common.c:2214  WARK: running dmt with DM-DEV_DISABLE_LIBRARY_FALLBACK flag
16:40:35.182048 vgscan[55466] device_mapper/ioctl/libdm-iface.c:1853  dm names   [ opencount flush ]   [16384] (*1)
16:40:35.182379 vgscan[55466] device_mapper/ioctl/libdm-iface.c:1853  dm mknodes mpatha  [ noopencount flush ]   [16384] (*1)
16:40:35.182687 vgscan[55466] device_mapper/libdm-common.c:1484  mpatha: Stacking NODE_ADD (253,0) 0:6 0660 [trust_udev]
16:40:35.183004 vgscan[55466] device_mapper/ioctl/libdm-iface.c:1853  dm mknodes mpatha-part2  [ noopencount flush ]   [16384] (*1)
16:40:35.183341 vgscan[55466] device_mapper/libdm-common.c:1484  mpatha-part2: Stacking NODE_ADD (253,2) 0:6 0660 [trust_udev]
16:40:35.183648 vgscan[55466] device_mapper/ioctl/libdm-iface.c:1853  dm mknodes mpatha-part1  [ noopencount flush ]   [16384] (*1)
16:40:35.183968 vgscan[55466] device_mapper/libdm-common.c:1484  mpatha-part1: Stacking NODE_ADD (253,1) 0:6 0660 [trust_udev]
16:40:35.184275 vgscan[55466] device_mapper/libdm-common.c:2218  WARK: running out path
16:40:35.184563 vgscan[55466] activate/fs.c:492  Syncing device names
16:40:35.184862 vgscan[55466] device_mapper/libdm-common.c:1484  mpatha: Skipping NODE_ADD (253,0) 0:6 0660 [trust_udev]
16:40:35.185163 vgscan[55466] device_mapper/libdm-common.c:1484  mpatha-part2: Skipping NODE_ADD (253,2) 0:6 0660 [trust_udev]
16:40:35.185478 vgscan[55466] device_mapper/libdm-common.c:1484  mpatha-part1: Skipping NODE_ADD (253,1) 0:6 0660 [trust_udev]
16:40:35.185806 vgscan[55466] device_mapper/libdm-config.c:986  report/output_format not found in config: defaulting to basic
16:40:35.186112 vgscan[55466] device_mapper/libdm-config.c:1085  log/report_command_log not found in config: defaulting to 0

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https://bugs.launchpad.net/bugs/1874501

Title:
  vgscan --mknodes creates block device multipath nodes in /dev/mapper

Status in Ubuntu on IBM z Systems:
  New
Status in lvm2 package in Ubuntu:
  Confirmed

Bug description:
  Description:    Ubuntu 20.04 LTS
  Release:        20.04

  # apt-cache policy multipath-tools
  multipath-tools:
    Installed: 0.8.3-1ubuntu2
    Candidate: 0.8.3-1ubuntu2
    Version table:
   *** 0.8.3-1ubuntu2 500
          500 http://ports.ubuntu.com/ubuntu-ports focal/main s390x Packages
          100 /var/lib/dpkg/status

  /dev/mapper/mpatha is symlink which points to ../../dm-X device

  /dev/mapper/mpath is block device

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: multipath-tools 0.8.3-1ubuntu2
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic s390x
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: s390x
  CasperMD5CheckResult: pass
  CasperVersion: 1.445
  Date: Thu Apr 23 17:32:12 2020
  LiveMediaBuild: Ubuntu-Server 20.04 LTS "Focal Fossa" - Release s390x (20200423.1)
  ProcEnviron:
   TERM=screen.xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: multipath-tools
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.multipath.conf:
   defaults {
       user_friendly_names yes
       skip_kpartx no
       verbosity 4
   }
  mtime.conffile..etc.multipath.conf: 2020-04-23T15:47:28.659850

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