[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[Launchpad Bug Tracker]

This bug was fixed in the package multipath-tools - 0.4.9-3ubuntu7.9

---
multipath-tools (0.4.9-3ubuntu7.9) trusty; urgency=medium

  * debian/patches/kpartx-support-device-names-with-spaces.patch: fix loopback
files unmapping. (LP: #1543430)

multipath-tools (0.4.9-3ubuntu7.8) trusty; urgency=medium

  * debian/patches/kpartx-support-device-names-with-spaces.patch: deal with
spaces in device names in kpartx too (LP: #1432062)
  * debian/initramfs/local-premount: wait for udev to settle before mounting
so the by-uuid/ symlinks have a chance to be updated by udev rules.
(LP: #1503286)
  * Allow device detection all through the initramfs: run multipathd instead
of only scanning once for devices, so those that come up slower can still
be used as a root device (LP: #1526984):
- debian/patches/0050-readonly-bindings_prefix.patch,
  debian/patches/0051-readonly-bindings_multipath.patch,
  debian/patches/0052-readonly-bindings_multipathd.patch,
  debian/patches/0053-readonly-bindings_multipathd_prod.patch: support -B
  to allow multipathd to handle cases where the bindings file is read-only.
- debian/initramfs/hooks: install multipathd and required directories.
- debian/initramfs/local-premount: also reload all maps to make sure
  they're ready before we mount.
- debian/initramfs/local-top: run multipathd rather than a one-off call to
  multipath so that new paths can be correctly added as detected while
  we're still in the initramfs.
- debian/initramfs/local-bottom: remember to stop multipathd.
- debian/initramfs/local-bottom, debian/rules: install local-bottom for
  initramfs.
  * debian/patches/lp1496210_add_IBM_XIV_defaults.patch: add support (default
config values) for the IBM 2810XIV storage system. (LP: #1496210)
  * debian/patches/0054-kpartx-update-option.patch: run kpartx -u rather than
kpartx -a, so as to remove old partition entries if the partition table
has changed. (LP: #1473903)
  * debian/patches/multipath_enable_sync_support_1b8082c8.patch,
debian/patches/kpartx_rely_on_udev_dev_creation_9a632fff.patch: synchronize
udev, device-mapper and multipath, and let udev deal with creating device
nodes and symlinks. (LP: #1486370)
  * debian/initramfs/local-top: drop scsi_wait_scan stanza, that module is no
longer available. (LP: #1538775)

 -- Mathieu Trudel-Lapierre   Tue, 09 Feb 2016
16:03:10 -0500

** Changed in: multipath-tools (Ubuntu Trusty)
   Status: Fix Committed => Fix Released

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Title:
  ISST-LTE: not all mpath device files are symbol link

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[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[Brian Murray]

Hello bugproxy, or anyone else affected,

Accepted multipath-tools into trusty-proposed. The package will build
now and be available at https://launchpad.net/ubuntu/+source/multipath-
tools/0.4.9-3ubuntu7.9 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Tags removed: verification-done

** Tags added: verification-needed

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Title:
  ISST-LTE: not all mpath device files are symbol link

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[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[Mathieu Trudel-Lapierre]

This was already verified successfully before; the additional update
does not need reverification, only checking the regression in bug
1543430.

** Tags removed: verification-needed
** Tags added: verification-done

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Title:
  ISST-LTE: not all mpath device files are symbol link

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[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[Mauricio Faria de Oliveira]

This is working correctly w/ kpartx.
One instance it seems to be still generating symlinks/nodes intermixed is when 
using parted.
However, during reboot and post-boot kpartx invocation, it is pretty consistent 
w/ only nodes.
So, this seems correct with regards to the code in multipath-tools.
Marking verification-done.

After parted:

# ls -l /dev/mapper/mpath1*
brw-rw 1 root disk 252, 1 Feb  9 11:26 /dev/mapper/mpath1
brw-rw 1 root disk 252, 3 Feb  9 11:16 /dev/mapper/mpath1-part1
lrwxrwxrwx 1 root root  7 Feb  9 11:16 /dev/mapper/mpath1-part2 -> ../dm-6
lrwxrwxrwx 1 root root  7 Feb  9 11:17 /dev/mapper/mpath1-part3 -> ../dm-7
lrwxrwxrwx 1 root root  7 Feb  9 11:17 /dev/mapper/mpath1-part4 -> ../dm-8
lrwxrwxrwx 1 root root  7 Feb  9 11:26 /dev/mapper/mpath1-part5 -> ../dm-9
lrwxrwxrwx 1 root root  8 Feb  9 11:26 /dev/mapper/mpath1-part6 -> ../dm-10
lrwxrwxrwx 1 root root  8 Feb  9 11:26 /dev/mapper/mpath1-part7 -> ../dm-11
lrwxrwxrwx 1 root root  8 Feb  9 11:26 /dev/mapper/mpath1-part8 -> ../dm-12

After reboot:

# ls -l /dev/mapper/mpath1*
brw-rw 1 root disk 252,  1 Feb  9 11:28 /dev/mapper/mpath1
brw-rw 1 root disk 252,  3 Feb  9 11:28 /dev/mapper/mpath1-part1
brw-rw 1 root disk 252,  5 Feb  9 11:28 /dev/mapper/mpath1-part2
brw-rw 1 root disk 252,  7 Feb  9 11:28 /dev/mapper/mpath1-part3
brw-rw 1 root disk 252,  8 Feb  9 11:28 /dev/mapper/mpath1-part4
brw-rw 1 root disk 252,  9 Feb  9 11:28 /dev/mapper/mpath1-part5
brw-rw 1 root disk 252, 10 Feb  9 11:28 /dev/mapper/mpath1-part6
brw-rw 1 root disk 252, 11 Feb  9 11:28 /dev/mapper/mpath1-part7
brw-rw 1 root disk 252, 12 Feb  9 11:28 /dev/mapper/mpath1-part8

After a series of kpartx -d/-a -p -part:

# ls -l /dev/mapper/mpath1*
brw-rw 1 root disk 252,  1 Feb  9 11:34 /dev/mapper/mpath1
brw-rw 1 root disk 252,  3 Feb  9 11:34 /dev/mapper/mpath1-part1
brw-rw 1 root disk 252,  5 Feb  9 11:34 /dev/mapper/mpath1-part2
brw-rw 1 root disk 252,  7 Feb  9 11:34 /dev/mapper/mpath1-part3
brw-rw 1 root disk 252,  8 Feb  9 11:34 /dev/mapper/mpath1-part4
brw-rw 1 root disk 252,  9 Feb  9 11:34 /dev/mapper/mpath1-part5
brw-rw 1 root disk 252, 10 Feb  9 11:34 /dev/mapper/mpath1-part6
brw-rw 1 root disk 252, 11 Feb  9 11:34 /dev/mapper/mpath1-part7
brw-rw 1 root disk 252, 12 Feb  9 11:34 /dev/mapper/mpath1-part8
# kpartx -d -p -part /dev/mapper/mpath1
# ls -l /dev/mapper/mpath1*
brw-rw 1 root disk 252, 1 Feb  9 11:34 /dev/mapper/mpath1
# kpartx -a -p -part /dev/mapper/mpath1
# ls -l /dev/mapper/mpath1*
brw-rw 1 root disk 252,  1 Feb  9 11:34 /dev/mapper/mpath1
brw-rw 1 root disk 252,  3 Feb  9 11:34 /dev/mapper/mpath1-part1
brw-rw 1 root disk 252,  5 Feb  9 11:34 /dev/mapper/mpath1-part2
brw-rw 1 root disk 252,  7 Feb  9 11:34 /dev/mapper/mpath1-part3
brw-rw 1 root disk 252,  8 Feb  9 11:34 /dev/mapper/mpath1-part4
brw-rw 1 root disk 252,  9 Feb  9 11:34 /dev/mapper/mpath1-part5
brw-rw 1 root disk 252, 10 Feb  9 11:34 /dev/mapper/mpath1-part6
brw-rw 1 root disk 252, 11 Feb  9 11:34 /dev/mapper/mpath1-part7
brw-rw 1 root disk 252, 12 Feb  9 11:34 /dev/mapper/mpath1-part8
# kpartx -d -p -part /dev/mapper/mpath1
# ls -l /dev/mapper/mpath1*
brw-rw 1 root disk 252, 1 Feb  9 11:34 /dev/mapper/mpath1
# kpartx -a -p -part /dev/mapper/mpath1
# ls -l /dev/mapper/mpath1*
brw-rw 1 root disk 252,  1 Feb  9 11:34 /dev/mapper/mpath1
brw-rw 1 root disk 252,  3 Feb  9 11:35 /dev/mapper/mpath1-part1
brw-rw 1 root disk 252,  5 Feb  9 11:35 /dev/mapper/mpath1-part2
brw-rw 1 root disk 252,  7 Feb  9 11:35 /dev/mapper/mpath1-part3
brw-rw 1 root disk 252,  8 Feb  9 11:35 /dev/mapper/mpath1-part4
brw-rw 1 root disk 252,  9 Feb  9 11:35 /dev/mapper/mpath1-part5
brw-rw 1 root disk 252, 10 Feb  9 11:35 /dev/mapper/mpath1-part6
brw-rw 1 root disk 252, 11 Feb  9 11:35 /dev/mapper/mpath1-part7
brw-rw 1 root disk 252, 12 Feb  9 11:35 /dev/mapper/mpath1-part8
# kpartx -d -p -part /dev/mapper/mpath1
# ls -l /dev/mapper/mpath1*
brw-rw 1 root disk 252, 1 Feb  9 11:34 /dev/mapper/mpath1
# kpartx -a -p -part /dev/mapper/mpath1
# ls -l /dev/mapper/mpath1*
brw-rw 1 root disk 252,  1 Feb  9 11:34 /dev/mapper/mpath1
brw-rw 1 root disk 252,  3 Feb  9 11:35 /dev/mapper/mpath1-part1
brw-rw 1 root disk 252,  5 Feb  9 11:35 /dev/mapper/mpath1-part2
brw-rw 1 root disk 252,  7 Feb  9 11:35 /dev/mapper/mpath1-part3
brw-rw 1 root disk 252,  8 Feb  9 11:35 /dev/mapper/mpath1-part4
brw-rw 1 root disk 252,  9 Feb  9 11:35 /dev/mapper/mpath1-part5
brw-rw 1 root disk 252, 10 Feb  9 11:35 /dev/mapper/mpath1-part6
brw-rw 1 root disk 252, 11 Feb  9 11:35 /dev/mapper/mpath1-part7
brw-rw 1 root disk 252, 12 Feb  9 11:35 /dev/mapper/mpath1-part8


** Tags removed: verification-needed
** Tags added: verification-done

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[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[Brian Murray]

Hello bugproxy, or anyone else affected,

Accepted multipath-tools into trusty-proposed. The package will build
now and be available at https://launchpad.net/ubuntu/+source/multipath-
tools/0.4.9-3ubuntu7.8 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: multipath-tools (Ubuntu Trusty)
   Status: In Progress => Fix Committed

** Tags added: verification-needed

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Title:
  ISST-LTE: not all mpath device files are symbol link

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[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[Mathieu Trudel-Lapierre]

** Description changed:

  [Impact]
  Minimal impact, this is limited to aesthetic issues; devices should if 
possible all be actual block device nodes rather than symlinks.
  
  [Test case]
  1) ls -l /dev/mapper
  2) Reboot, try again.
+ 
+ Also:
+ while true; do kpartx -d -p -part /dev/dm-2;udevadm settle; kpartx -a -p 
-part /dev/dm-2; udevadm settle;done
+ 
+ Or:
+ while true; do multipath -F; multipath; done
+ 
  
  [Regression potential]
  Timing issues may cause delays in generating device nodes or symlinks due to 
the need for multipath-tools, device-mapper and udev to synchronize.
  
  ---
  
  == Comment: #0 - Ping Tian Han  - 2015-07-21 23:38:48 ==
  ---Problem Description---
  Some mpath devices in /dev/mapper are symbol links to /dev/dm-, but there 
are exceptions:
  
  % ls -l /dev/mapper
  total 0
  crw--- 1 root root  10, 236 Jul 21 20:46 control
  lrwxrwxrwx 1 root root7 Jul 21 20:46 mpath0 -> ../dm-0
  brw--- 1 root root 252,   4 Jul 21 20:46 mpath0-part1
  brw--- 1 root root 252,   6 Jul 21 20:46 mpath0-part2
  brw--- 1 root root 252,   7 Jul 21 20:46 mpath0-part3
  lrwxrwxrwx 1 root root7 Jul 21 20:46 mpath1 -> ../dm-1
  brw-rw 1 root disk 252,   2 Jul 21 20:46 mpath2
  lrwxrwxrwx 1 root root7 Jul 21 20:46 mpath3 -> ../dm-3
  lrwxrwxrwx 1 root root7 Jul 21 20:46 mpath4 -> ../dm-5
  
  mpath2 isn't a symbol link.
  
  % sudo dmestup info mpath2
  sudo: dmestup: command not found
  % sudo dmsetup info mpath2
  Name:  mpath2
  State: ACTIVE
  Read Ahead:256
  Tables present:LIVE
  Open count:0
  Event number:  4
  Major, minor:  252, 2
  Number of targets: 1
  UUID: mpath-36005076304ffc69f0469
  
  % sudo dmsetup info /dev/dm-2
  Name:  mpath2
  State: ACTIVE
  Read Ahead:256
  Tables present:LIVE
  Open count:0
  Event number:  4
  Major, minor:  252, 2
  Number of targets: 1
  UUID: mpath-36005076304ffc69f0469
  
  Contact Information = Ping Tian Han/pt...@cn.ibm.com,   Chanh H
  Nguyen/chngu...@us.ibm.com
  
  ---uname output---
  Linux onyxlp2 3.19.0-22-generic #22~14.04.1-Ubuntu SMP Wed Jun 17 10:03:39 
UTC 2015 ppc64le ppc64le ppc64le GNU/Linux
  
  Machine Type = na
  
  ---Steps to Reproduce---
   1. install ubuntu on onyxlp2, which has mpath device
  2. ls /dev/mapper, see some mpath device file isn't symbol link
  
  Userspace tool common name: na
  
  The userspace tool has the following bit modes: 64-bit
  
  Userspace rpm: na
  
  Userspace tool obtained from project website:  na
  
  == Comment: #6 - Mauricio Faria De Oliveira  - 
2015-08-18 12:33:17 ==
  This shouldn't be a problem at all.
  Either symlinks to the dm devices or block devices which refer to them 
directly (via major:minor number) will work.
  
  It isn't ideal, though.
  
  == Comment: #7 - Mauricio Faria De Oliveira  - 
2015-08-18 12:35:34 ==
  BTW, that expectation is per the SRU policy.
  
  And the problem cause is likely a race involving udev rules (multipath &
  kpartx), and possibly multipathd.

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Title:
  ISST-LTE: not all mpath device files are symbol link

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[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[Ming-Xun Zhong]

Hi,

I encounter this bug on Precise, and apply these two patch from upstream
fix it.

http://git.opensvc.com/gitweb.cgi?p=multipath-tools/.git;a=commit;h=1b8082c8fc81374ba7b0204f6de8f71de5500192
http://git.opensvc.com/gitweb.cgi?p=multipath-tools/.git;a=commit;h=9a632fff65df3bf82a3ef70f62319a1c45f3c028

In my environment it easily reproduce with

Case 1:
while true; do kpartx -d -p -part /dev/dm-2;udevadm settle;  kpartx   -a -p 
-part /dev/dm-2;  udevadm settle;done

Case 2:
while true; do multipath -F;  multipath; done

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Title:
  ISST-LTE: not all mpath device files are symbol link

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[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[bugproxy]

** Tags removed: targetmilestone-inin---
** Tags added: targetmilestone-inin14044

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Title:
  ISST-LTE: not all mpath device files are symbol link

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[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[Luciano Chavez]

** Changed in: multipath-tools (Ubuntu)
 Assignee: (unassigned) => Taco Screen team (taco-screen-team)

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Title:
  ISST-LTE: not all mpath device files are symbol link

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[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[Mathieu Trudel-Lapierre]

Could you please verify that you're not seeing this issue on 16.04? It
looks like the patch found should solve this, but it's hard to verify
given that this is very dependent on the speed of the system on which
multipath-tools run, as well as how fast udev can run, scan devices,
etc.

** Description changed:

+ [Impact]
+ Minimal impact, this is limited to aesthetic issues; devices should if 
possible all be actual block device nodes rather than symlinks.
+ 
+ [Test case]
+ 1) ls -l /dev/mapper
+ 2) Reboot, try again.
+ 
+ [Regression potential]
+ Timing issues may cause delays in generating device nodes or symlinks due to 
the need for multipath-tools, device-mapper and udev to synchronize.
+ 
+ ---
+ 
  == Comment: #0 - Ping Tian Han  - 2015-07-21 23:38:48 ==
  ---Problem Description---
  Some mpath devices in /dev/mapper are symbol links to /dev/dm-, but there 
are exceptions:
  
- % ls -l /dev/mapper 
+ % ls -l /dev/mapper
  total 0
  crw--- 1 root root  10, 236 Jul 21 20:46 control
  lrwxrwxrwx 1 root root7 Jul 21 20:46 mpath0 -> ../dm-0
  brw--- 1 root root 252,   4 Jul 21 20:46 mpath0-part1
  brw--- 1 root root 252,   6 Jul 21 20:46 mpath0-part2
  brw--- 1 root root 252,   7 Jul 21 20:46 mpath0-part3
  lrwxrwxrwx 1 root root7 Jul 21 20:46 mpath1 -> ../dm-1
  brw-rw 1 root disk 252,   2 Jul 21 20:46 mpath2
  lrwxrwxrwx 1 root root7 Jul 21 20:46 mpath3 -> ../dm-3
  lrwxrwxrwx 1 root root7 Jul 21 20:46 mpath4 -> ../dm-5
  
  mpath2 isn't a symbol link.
  
  % sudo dmestup info mpath2
  sudo: dmestup: command not found
  % sudo dmsetup info mpath2
  Name:  mpath2
  State: ACTIVE
  Read Ahead:256
  Tables present:LIVE
  Open count:0
  Event number:  4
  Major, minor:  252, 2
  Number of targets: 1
  UUID: mpath-36005076304ffc69f0469
  
- % sudo dmsetup info /dev/dm-2 
+ % sudo dmsetup info /dev/dm-2
  Name:  mpath2
  State: ACTIVE
  Read Ahead:256
  Tables present:LIVE
  Open count:0
  Event number:  4
  Major, minor:  252, 2
  Number of targets: 1
  UUID: mpath-36005076304ffc69f0469
  
+ Contact Information = Ping Tian Han/pt...@cn.ibm.com,   Chanh H
+ Nguyen/chngu...@us.ibm.com
  
-  
- Contact Information = Ping Tian Han/pt...@cn.ibm.com, Chanh H 
Nguyen/chngu...@us.ibm.com 
-  
  ---uname output---
  Linux onyxlp2 3.19.0-22-generic #22~14.04.1-Ubuntu SMP Wed Jun 17 10:03:39 
UTC 2015 ppc64le ppc64le ppc64le GNU/Linux
-  
- Machine Type = na 
-  
+ 
+ Machine Type = na
+ 
  ---Steps to Reproduce---
-  1. install ubuntu on onyxlp2, which has mpath device
+  1. install ubuntu on onyxlp2, which has mpath device
  2. ls /dev/mapper, see some mpath device file isn't symbol link
-  
- Userspace tool common name: na 
-  
- The userspace tool has the following bit modes: 64-bit 
+ 
+ Userspace tool common name: na
+ 
+ The userspace tool has the following bit modes: 64-bit
  
  Userspace rpm: na
  
- Userspace tool obtained from project website:  na 
-  
+ Userspace tool obtained from project website:  na
+ 
  == Comment: #6 - Mauricio Faria De Oliveira  - 
2015-08-18 12:33:17 ==
  This shouldn't be a problem at all.
  Either symlinks to the dm devices or block devices which refer to them 
directly (via major:minor number) will work.
  
  It isn't ideal, though.
  
  == Comment: #7 - Mauricio Faria De Oliveira  - 
2015-08-18 12:35:34 ==
  BTW, that expectation is per the SRU policy.
  
  And the problem cause is likely a race involving udev rules (multipath &
  kpartx), and possibly multipathd.

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https://bugs.launchpad.net/bugs/1486370

Title:
  ISST-LTE: not all mpath device files are symbol link

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[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[Mathieu Trudel-Lapierre]

I just confirmed this is already applied in 0.5.0 (so in 15.10 and
later).

** Changed in: multipath-tools (Ubuntu)
 Assignee: Mathieu Trudel-Lapierre (mathieu-tl) => (unassigned)

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https://bugs.launchpad.net/bugs/1486370

Title:
  ISST-LTE: not all mpath device files are symbol link

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[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[Mathieu Trudel-Lapierre]

I think this is http://git.opensvc.com/gitweb.cgi?p=multipath-
tools/.git;a=commit;h=9a632fff65df3bf82a3ef70f62319a1c45f3c028. It's
already targetted because it helps with another, similar issue (parted
creating multiple device nodes for the same partition).

In progress.

** Also affects: multipath-tools (Ubuntu Trusty)
   Importance: Undecided
   Status: New

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

** Changed in: multipath-tools (Ubuntu Trusty)
 Assignee: (unassigned) => Mathieu Trudel-Lapierre (mathieu-tl)

** Changed in: multipath-tools (Ubuntu Trusty)
   Status: New => In Progress

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

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https://bugs.launchpad.net/bugs/1486370

Title:
  ISST-LTE: not all mpath device files are symbol link

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[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[Steve Langasek]

** Changed in: multipath-tools (Ubuntu)
 Assignee: Taco Screen team (taco-screen-team) => Mathieu Trudel-Lapierre 
(mathieu-tl)

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https://bugs.launchpad.net/bugs/1486370

Title:
  ISST-LTE: not all mpath device files are symbol link

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[Bug 1486370] Re: ISST-LTE: not all mpath device files are symbol link

[Martin Pitt]

** Package changed: udev (Ubuntu) => multipath-tools (Ubuntu)

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https://bugs.launchpad.net/bugs/1486370

Title:
  ISST-LTE: not all mpath device files are symbol link

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