[Bug 1479031] Re: attached block devices not showing up

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 3.2.0-92.130

---
linux (3.2.0-92.130) precise; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
- LP: #1500854

  [ dan.street...@canonical.com ]

  * [Config] HOTPLUG_PCI_ACPI=y
- LP: #1479031

  [ John Johansen ]

  * SAUCE: (no-up) apparmor: fix mount not handling disconnected paths
- LP: #1496430

  [ Upstream Kernel Changes ]

  * RDS: verify the underlying transport exists before creating a
connection
- LP: #1496232
- CVE-2015-6937
  * virtio-net: drop NETIF_F_FRAGLIST
- LP: #1484793
- CVE-2015-5156

 -- Brad Figg   Mon, 05 Oct 2015 13:50:43 -0700

** Changed in: linux (Ubuntu Precise)
   Status: Fix Committed => Fix Released

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2015-5156

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2015-6937

** Changed in: linux (Ubuntu Precise)
   Status: Fix Committed => Fix Released

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Title:
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[Bug 1479031] Re: attached block devices not showing up

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 3.2.0-92.130

---
linux (3.2.0-92.130) precise; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
- LP: #1500854

  [ dan.street...@canonical.com ]

  * [Config] HOTPLUG_PCI_ACPI=y
- LP: #1479031

  [ John Johansen ]

  * SAUCE: (no-up) apparmor: fix mount not handling disconnected paths
- LP: #1496430

  [ Upstream Kernel Changes ]

  * RDS: verify the underlying transport exists before creating a
connection
- LP: #1496232
- CVE-2015-6937
  * virtio-net: drop NETIF_F_FRAGLIST
- LP: #1484793
- CVE-2015-5156

 -- Brad Figg   Mon, 05 Oct 2015 13:50:43 -0700

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Title:
  attached block devices not showing up

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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

#
# Precise latest kernel
#
# CONFIG_HOTPLUG_PCI_ACPI=y
#

inaddy@sf00068947precise:boot$ uname -a
Linux sf00068947precise 3.2.0-92-generic #130-Ubuntu SMP Mon Oct 5 21:43:10 UTC 
2015 x86_64 x86_64 x86_64 GNU/Linux

inaddy@alien:teste$ ./teste.sh
% RUN: 1
+ Creating disk 0: /dev/vdb
+ Creating disk 1: /dev/vdc
! Starting virtual machine
! Adding disk 0: /dev/vdb
! Adding disk 1: /dev/vdc
! Waiting virtual machine network to be up
! Checking if disk is online:
* Found 2 extra disks online
! Destroying virtual machine
...
...
% RUN: 16
+ Creating disk 0: /dev/vdb
+ Creating disk 1: /dev/vdc
! Starting virtual machine
! Adding disk 0: /dev/vdb
! Adding disk 1: /dev/vdc
! Waiting virtual machine network to be up
! Checking if disk is online:
* Found 2 extra disks online
! Destroying virtual machine
...

-> verification done

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

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Title:
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[Bug 1479031] Re: attached block devices not showing up

[Luis Henriques]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
precise' to 'verification-done-precise'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-precise

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[Bug 1479031] Re: attached block devices not showing up

[Brad Figg]

** Changed in: linux (Ubuntu Precise)
   Status: In Progress => Fix Committed

** Changed in: linux (Ubuntu)
   Status: Fix Released => Invalid

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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

** Tags added: sts

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[Bug 1479031] Re: attached block devices not showing up

[Dan Streetman]

Here is a PPA with a fix for this:

https://pad.lv/ppa/ddstreet/lp1479031

There was no code change required; the only change is the acpiphp driver
is built-in, instead of a module.

During boot, when the pci-acpi driver is loaded, it enumerates the bus.
Later when the acpiphp driver is loaded, it registers for any pci-acpi
hotplug events.  Between the pci-acpi driver loading and the acpiphp
driver loading, any pci acpi hotplug events are lost, since the bus was
already enumerated and there is no driver monitoring hotplugs.

Currently (without this PPA), pci-acpi is built-in, and enumerates the
pci acpi devices/buses during boot.  The acpiphp driver is a module,
however, and therefore loads much later - more than 4 seconds later, in
my brief tests.  With this PPA, the acpiphp driver is built-in, and
loads a fraction of a second after the pci-acpi driver - less than 1/4
second in my brief tests.

So to clarify, this does not eliminate the window of time where pci acpi
hotplug events will be lost, it only reduces it from multiple seconds,
down to a small fraction of a second.

You can check the size of the window where hotplug events will be lost with:
# dmesg | grep ACPI: bus type pci
[0.230350] ACPI: bus type pci registered
# dmesg | grep acpiphp: ACPI
[0.517999] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5

that's not the exact window, since pci enumeration happens after the bus
type is registered, so it's a bit smaller than that.

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Title:
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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

Per Dan's request... second test is what he asked me to test - It
reasonably mitigates the issue:

#
# Precise latest -updates kernel
#

inaddy@sf00068947precise:~$ uname -a
Linux sf00068947precise 3.2.0-89-generic #127-Ubuntu SMP Tue Jul 28 09:28:15 
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

inaddy@alien:teste$ ./teste.sh
% RUN: 1
+ Creating disk 0: /dev/vdb
+ Creating disk 1: /dev/vdc
! Starting virtual machine
! Adding disk 0: /dev/vdb
! Adding disk 1: /dev/vdc
! Waiting virtual machine network to be up
! Checking if disk is online:
* Found 0 extra disks online
$ Missing disk(s) exiting

inaddy@alien:teste$ virsh shutdown sf00068947precise
Domain sf00068947precise is being shutdown

inaddy@alien:teste$ ./teste.sh
% RUN: 1
+ Creating disk 0: /dev/vdb
+ Creating disk 1: /dev/vdc
! Starting virtual machine
! Adding disk 0: /dev/vdb
! Adding disk 1: /dev/vdc
! Waiting virtual machine network to be up
! Checking if disk is online:
* Found 0 extra disks online
$ Missing disk(s) exiting

#
# Precise latest kernel - CONFIG_ACPI_HOTPLUG_CPU=y
#

inaddy@sf00068947precise:~$ uname -a
Linux sf00068947precise 3.2.69-inaddy #1 SMP Wed Aug 12 15:43:37 BRT 2015 
x86_64 x86_64 x86_64 GNU/Linux

inaddy@alien:teste$ ./teste.sh
% RUN: 1
+ Creating disk 0: /dev/vdb
+ Creating disk 1: /dev/vdc
! Starting virtual machine
! Adding disk 0: /dev/vdb
! Adding disk 1: /dev/vdc
! Waiting virtual machine network to be up
! Checking if disk is online:
* Found 2 extra disks online
! Destroying virtual machine
...
...
% RUN: 16
+ Creating disk 0: /dev/vdb
+ Creating disk 1: /dev/vdc
! Starting virtual machine
! Adding disk 0: /dev/vdb
! Adding disk 1: /dev/vdc
! Waiting virtual machine network to be up
! Checking if disk is online:
* Found 2 extra disks online
! Destroying virtual machine
...

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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

Per Dan's request... second test is what he asked me to test - It
reasonably mitigates the issue:

#
# Precise latest -updates kernel
#

inaddy@sf00068947precise:~$ uname -a
Linux sf00068947precise 3.2.0-89-generic #127-Ubuntu SMP Tue Jul 28 09:28:15 
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

inaddy@alien:teste$ ./teste.sh
% RUN: 1
+ Creating disk 0: /dev/vdb
+ Creating disk 1: /dev/vdc
! Starting virtual machine
! Adding disk 0: /dev/vdb
! Adding disk 1: /dev/vdc
! Waiting virtual machine network to be up
! Checking if disk is online:
* Found 0 extra disks online
$ Missing disk(s) exiting

inaddy@alien:teste$ virsh shutdown sf00068947precise
Domain sf00068947precise is being shutdown

inaddy@alien:teste$ ./teste.sh
% RUN: 1
+ Creating disk 0: /dev/vdb
+ Creating disk 1: /dev/vdc
! Starting virtual machine
! Adding disk 0: /dev/vdb
! Adding disk 1: /dev/vdc
! Waiting virtual machine network to be up
! Checking if disk is online:
* Found 0 extra disks online
$ Missing disk(s) exiting

#
# Precise latest kernel 
#
# CONFIG_HOTPLUG_PCI=y
# CONFIG_HOTPLUG_PCI_FAKE=m
# CONFIG_HOTPLUG_PCI_ACPI=y
#

inaddy@sf00068947precise:~$ uname -a
Linux sf00068947precise 3.2.69-inaddy #1 SMP Wed Aug 12 15:43:37 BRT 2015 
x86_64 x86_64 x86_64 GNU/Linux

inaddy@alien:teste$ ./teste.sh
% RUN: 1
+ Creating disk 0: /dev/vdb
+ Creating disk 1: /dev/vdc
! Starting virtual machine
! Adding disk 0: /dev/vdb
! Adding disk 1: /dev/vdc
! Waiting virtual machine network to be up
! Checking if disk is online:
* Found 2 extra disks online
! Destroying virtual machine
...
...
% RUN: 16
+ Creating disk 0: /dev/vdb
+ Creating disk 1: /dev/vdc
! Starting virtual machine
! Adding disk 0: /dev/vdb
! Adding disk 1: /dev/vdc
! Waiting virtual machine network to be up
! Checking if disk is online:
* Found 2 extra disks online
! Destroying virtual machine
...

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Title:
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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

** Changed in: linux (Ubuntu Precise)
   Status: Confirmed = In Progress

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Title:
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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

Just out of curiosity, if I sleep in between starting the virtual
machine AND adding the disks (sleep 10, for example)... Then the disk
attachment works almost 100% of the times:

% RUN: 1
+ Creating disk 0: /dev/vdb
+ Creating disk 1: /dev/vdc
! Starting virtual machine
! Adding disk 0: /dev/vdb
! Adding disk 1: /dev/vdc
! Waiting virtual machine network to be up
! Checking if disk is online:
* Found 2 extra disks online
! Destroying virtual machine
% RUN: 2
+ Creating disk 0: /dev/vdb
+ Creating disk 1: /dev/vdc
! Starting virtual machine
...

** Changed in: linux (Ubuntu Precise)
 Assignee: Rafael David Tinoco (inaddy) = (unassigned)

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[Bug 1479031] Re: attached block devices not showing up

[Dan Streetman]

** Changed in: linux (Ubuntu Precise)
 Assignee: (unassigned) = Dan Streetman (ddstreet)

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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

Second reproducer for this bug (shell script attaching ceph volumes on kvm 
machine).
Make sure to run this as 1st level guest (2nd level is slow and don't trigger 
the issue).

** Attachment added: teste.sh
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1479031/+attachment/4443005/+files/teste.sh

** Attachment removed: precise.xml
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1479031/+attachment/4443004/+files/precise.xml

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Title:
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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

To be attached disk definition (using ceph)

** Attachment added: diskNUM.xml
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1479031/+attachment/4443003/+files/diskNUM.xml

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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

Virtual machine definition (being used to attach/dettach ceph volumes)

OBS: ceph is being used just because original problem was using ceph
also


** Attachment added: precise.xml
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1479031/+attachment/4443012/+files/precise.xml

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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

Okay, following instructions already provided by Chris Arges -
responsible for the kernel bisection so far - and Ed - working on the
case since its beginning - I was able to create another reproducer - not
openstack dependant - that fails close to 100% of times.

Output:

# running test



inaddy@alien:test$ ./teste.sh
% RUN: 1
+ Creating disk 0: /dev/vdb
+ Creating disk 1: /dev/vdc
! Starting virtual machine
! Adding disk 0: /dev/vdb
! Adding disk 1: /dev/vdc
! Waiting virtual machine network to be up
! Checking if disk is online:
* Found 0 extra disks online
$ Missing disk(s) exiting

# checking results

inaddy@alien:test$ ssh sf00068947precise
Last login: Tue Aug 11 14:07:11 2015 from 192.168.128.1
inaddy@sf00068947precise:~$ ls -lah /dev/vd*
brw-rw 1 root disk 253, 0 Aug 11 14:29 /dev/vda
brw-rw 1 root disk 253, 1 Aug 11 14:29 /dev/vda1
brw-rw 1 root disk 253, 2 Aug 11 14:29 /dev/vda2
brw-rw 1 root disk 253, 5 Aug 11 14:29 /dev/vda5
inaddy@sf00068947precise:~$ echo 1 | sudo tee /sys/bus/pci/rescan
1
inaddy@sf00068947precise:~$ ls -lah /dev/vd*
brw-rw 1 root disk 253,  0 Aug 11 14:29 /dev/vda
brw-rw 1 root disk 253,  1 Aug 11 14:29 /dev/vda1
brw-rw 1 root disk 253,  2 Aug 11 14:29 /dev/vda2
brw-rw 1 root disk 253,  5 Aug 11 14:29 /dev/vda5
brw-rw 1 root disk 253, 16 Aug 11 14:29 /dev/vdb
brw-rw 1 root disk 253, 32 Aug 11 14:29 /dev/vdc



Attaching files for this second reproducer. This will guide me on
verifying a possible fix.

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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

Virtual machine definition (being used to attach/dettach ceph volumes)

OBS: ceph is being used just because original problem was using ceph
also

** Attachment added: precise.xml
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1479031/+attachment/4443004/+files/precise.xml

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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

** Changed in: linux (Ubuntu Precise)
 Assignee: (unassigned) = Rafael David Tinoco (inaddy)

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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

** Changed in: linux (Ubuntu Precise)
 Assignee: Rafael David Tinoco (inaddy) = (unassigned)

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[Bug 1479031] Re: attached block devices not showing up

[Chris J Arges]

** Changed in: linux (Ubuntu Precise)
   Importance: Undecided = High

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[Bug 1479031] Re: attached block devices not showing up

[Chris J Arges]

This commit fixes the issue, whereas the previous commit results in failure.
3b63aaa70e1ccc4b66d60acc78da09700706a703

Need to figure out how to backport this into 3.2, since this is not a
clean cherry-pick and is a fairly large change.

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[Bug 1479031] Re: attached block devices not showing up

[Rafael David Tinoco]

** Changed in: linux (Ubuntu Precise)
 Assignee: Chris J Arges (arges) = Rafael David Tinoco (inaddy)

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[Bug 1479031] Re: attached block devices not showing up

[Chris J Arges]

** Description changed:

  I have Ubuntu Precise guests running in kvm to which I attach volumes
  immediately after boot. Sometimes I notice that the devices do not show
  up in the guest e.g. they are not visible in /proc/partitions and dmesg
  boot log shows no sign of then being noticed. Qemu itself shows that the
  devices are attached and if I do a rescan within the guest the devices
  appear. A reboot also cause the devices to appear. So, it feels like
  there is enough evidence to suggest that the devices were properly
  attached by qemu/seabios but they just didn't get noticed by the guest.
  
  This issue is reproducible with Precise running 3.2, 3.5 (lts-quantal)
  and 3.8 (lts-raring) kernels but not as of 3.11 (lts-saucy) so it would
  appear that something changed between 3.8 and 3.11 that resolved this
  issue and if we can identify it we should backport to 3.2.
  
  I am able to reproduce this issue using Openstack to spin up vms and
  attach volumes using the following script:
  
  http://pastebin.ubuntu.com/11954253/
  
  I hit this issue with 1/2 instances.
+ 
+ As a workaround one can rescan and the device shows up:
+ echo 1 | sudo tee /sys/bus/pci/rescan

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Title:
  attached block devices not showing up

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[Bug 1479031] Re: attached block devices not showing up

[Chris J Arges]

Problem exists between v3.9 and v3.10.

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Title:
  attached block devices not showing up

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[Bug 1479031] Re: attached block devices not showing up

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: linux (Ubuntu Precise)
   Status: New = Confirmed

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Title:
  attached block devices not showing up

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[Bug 1479031] Re: attached block devices not showing up

[Chris J Arges]

** Changed in: linux (Ubuntu)
   Status: New = Fix Released

** Changed in: linux (Ubuntu Precise)
 Assignee: (unassigned) = Chris J Arges (arges)

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Title:
  attached block devices not showing up

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[Bug 1479031] Re: attached block devices not showing up

[Edward Hope-Morley]

** Description changed:

  I have Ubuntu Precise guests running in kvm to which I attach volumes
  immediately after boot. Sometimes I notice that the devices do not show
  up in the guest e.g. they are not visible in /proc/partitions and dmesg
  boot log shows no sign of then being noticed. Qemu itself shows that the
  devices are attached and if I do a rescan within the guest the devices
  appear. A reboot also cause the devices to appear. So, it feels like
  there is enough evidence to suggest that the devices were properly
  attached by qemu/seabios but they just didn't get noticed by the guest.
  
  This issue is reproducible with Precise running 3.2, 3.5 (lts-quantal)
  and 3.8 (lts-raring) kernels but not as of 3.11 (lts-saucy) so it would
  appear that something changed between 3.8 and 3.11 that resolved this
  issue and if we can identify it we should backport to 3.2.
  
- I am currently able to reproduce this issue using openstack to spin up
- vms and attach volumes using the following script:
+ I am able to reproduce this issue using Openstack to spin up vms and
+ attach volumes using the following script:
  
  http://pastebin.ubuntu.com/11954253/
  
- I currently hit this issue with 1/2 instrances.
+ I hit this issue with 1/2 instances.

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Title:
  attached block devices not showing up

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[Bug 1479031] Re: attached block devices not showing up

[Chris J Arges]

** Also affects: linux (Ubuntu Precise)
   Importance: Undecided
   Status: New

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Title:
  attached block devices not showing up

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