Comment 4 for bug 1479031

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

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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

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